2 * Copyright (C) 2015 Free Electrons
3 * Copyright (C) 2015 NextThing Co
5 * Maxime Ripard <maxime.ripard@free-electrons.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
14 #include <drm/drm_atomic.h>
15 #include <drm/drm_atomic_helper.h>
16 #include <drm/drm_crtc.h>
17 #include <drm/drm_crtc_helper.h>
18 #include <drm/drm_fb_cma_helper.h>
19 #include <drm/drm_gem_cma_helper.h>
20 #include <drm/drm_plane_helper.h>
22 #include <linux/component.h>
23 #include <linux/list.h>
24 #include <linux/of_device.h>
25 #include <linux/of_graph.h>
26 #include <linux/reset.h>
28 #include "sun4i_backend.h"
29 #include "sun4i_drv.h"
30 #include "sun4i_frontend.h"
31 #include "sun4i_layer.h"
32 #include "sunxi_engine.h"
34 struct sun4i_backend_quirks
{
35 /* backend <-> TCON muxing selection done in backend */
36 bool needs_output_muxing
;
38 /* alpha at the lowest z position is not always supported */
39 bool supports_lowest_plane_alpha
;
42 static const u32 sunxi_rgb2yuv_coef
[12] = {
43 0x00000107, 0x00000204, 0x00000064, 0x00000108,
44 0x00003f69, 0x00003ed6, 0x000001c1, 0x00000808,
45 0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808
49 * These coefficients are taken from the A33 BSP from Allwinner.
51 * The first three values of each row are coded as 13-bit signed fixed-point
52 * numbers, with 10 bits for the fractional part. The fourth value is a
53 * constant coded as a 14-bit signed fixed-point number with 4 bits for the
56 * The values in table order give the following colorspace translation:
57 * G = 1.164 * Y - 0.391 * U - 0.813 * V + 135
58 * R = 1.164 * Y + 1.596 * V - 222
59 * B = 1.164 * Y + 2.018 * U + 276
61 * This seems to be a conversion from Y[16:235] UV[16:240] to RGB[0:255],
62 * following the BT601 spec.
64 static const u32 sunxi_bt601_yuv2rgb_coef
[12] = {
65 0x000004a7, 0x00001e6f, 0x00001cbf, 0x00000877,
66 0x000004a7, 0x00000000, 0x00000662, 0x00003211,
67 0x000004a7, 0x00000812, 0x00000000, 0x00002eb1,
70 static void sun4i_backend_apply_color_correction(struct sunxi_engine
*engine
)
74 DRM_DEBUG_DRIVER("Applying RGB to YUV color correction\n");
76 /* Set color correction */
77 regmap_write(engine
->regs
, SUN4I_BACKEND_OCCTL_REG
,
78 SUN4I_BACKEND_OCCTL_ENABLE
);
80 for (i
= 0; i
< 12; i
++)
81 regmap_write(engine
->regs
, SUN4I_BACKEND_OCRCOEF_REG(i
),
82 sunxi_rgb2yuv_coef
[i
]);
85 static void sun4i_backend_disable_color_correction(struct sunxi_engine
*engine
)
87 DRM_DEBUG_DRIVER("Disabling color correction\n");
89 /* Disable color correction */
90 regmap_update_bits(engine
->regs
, SUN4I_BACKEND_OCCTL_REG
,
91 SUN4I_BACKEND_OCCTL_ENABLE
, 0);
94 static void sun4i_backend_commit(struct sunxi_engine
*engine
)
96 DRM_DEBUG_DRIVER("Committing changes\n");
98 regmap_write(engine
->regs
, SUN4I_BACKEND_REGBUFFCTL_REG
,
99 SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS
|
100 SUN4I_BACKEND_REGBUFFCTL_LOADCTL
);
103 void sun4i_backend_layer_enable(struct sun4i_backend
*backend
,
104 int layer
, bool enable
)
108 DRM_DEBUG_DRIVER("%sabling layer %d\n", enable
? "En" : "Dis",
112 val
= SUN4I_BACKEND_MODCTL_LAY_EN(layer
);
116 regmap_update_bits(backend
->engine
.regs
, SUN4I_BACKEND_MODCTL_REG
,
117 SUN4I_BACKEND_MODCTL_LAY_EN(layer
), val
);
120 static int sun4i_backend_drm_format_to_layer(u32 format
, u32
*mode
)
123 case DRM_FORMAT_ARGB8888
:
124 *mode
= SUN4I_BACKEND_LAY_FBFMT_ARGB8888
;
127 case DRM_FORMAT_ARGB4444
:
128 *mode
= SUN4I_BACKEND_LAY_FBFMT_ARGB4444
;
131 case DRM_FORMAT_ARGB1555
:
132 *mode
= SUN4I_BACKEND_LAY_FBFMT_ARGB1555
;
135 case DRM_FORMAT_RGBA5551
:
136 *mode
= SUN4I_BACKEND_LAY_FBFMT_RGBA5551
;
139 case DRM_FORMAT_RGBA4444
:
140 *mode
= SUN4I_BACKEND_LAY_FBFMT_RGBA4444
;
143 case DRM_FORMAT_XRGB8888
:
144 *mode
= SUN4I_BACKEND_LAY_FBFMT_XRGB8888
;
147 case DRM_FORMAT_RGB888
:
148 *mode
= SUN4I_BACKEND_LAY_FBFMT_RGB888
;
151 case DRM_FORMAT_RGB565
:
152 *mode
= SUN4I_BACKEND_LAY_FBFMT_RGB565
;
162 static const uint32_t sun4i_backend_formats
[] = {
178 bool sun4i_backend_format_is_supported(uint32_t fmt
, uint64_t modifier
)
182 if (modifier
!= DRM_FORMAT_MOD_LINEAR
)
185 for (i
= 0; i
< ARRAY_SIZE(sun4i_backend_formats
); i
++)
186 if (sun4i_backend_formats
[i
] == fmt
)
192 int sun4i_backend_update_layer_coord(struct sun4i_backend
*backend
,
193 int layer
, struct drm_plane
*plane
)
195 struct drm_plane_state
*state
= plane
->state
;
197 DRM_DEBUG_DRIVER("Updating layer %d\n", layer
);
199 if (plane
->type
== DRM_PLANE_TYPE_PRIMARY
) {
200 DRM_DEBUG_DRIVER("Primary layer, updating global size W: %u H: %u\n",
201 state
->crtc_w
, state
->crtc_h
);
202 regmap_write(backend
->engine
.regs
, SUN4I_BACKEND_DISSIZE_REG
,
203 SUN4I_BACKEND_DISSIZE(state
->crtc_w
,
207 /* Set height and width */
208 DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n",
209 state
->crtc_w
, state
->crtc_h
);
210 regmap_write(backend
->engine
.regs
, SUN4I_BACKEND_LAYSIZE_REG(layer
),
211 SUN4I_BACKEND_LAYSIZE(state
->crtc_w
,
214 /* Set base coordinates */
215 DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n",
216 state
->crtc_x
, state
->crtc_y
);
217 regmap_write(backend
->engine
.regs
, SUN4I_BACKEND_LAYCOOR_REG(layer
),
218 SUN4I_BACKEND_LAYCOOR(state
->crtc_x
,
224 static int sun4i_backend_update_yuv_format(struct sun4i_backend
*backend
,
225 int layer
, struct drm_plane
*plane
)
227 struct drm_plane_state
*state
= plane
->state
;
228 struct drm_framebuffer
*fb
= state
->fb
;
229 const struct drm_format_info
*format
= fb
->format
;
230 const uint32_t fmt
= format
->format
;
231 u32 val
= SUN4I_BACKEND_IYUVCTL_EN
;
234 for (i
= 0; i
< ARRAY_SIZE(sunxi_bt601_yuv2rgb_coef
); i
++)
235 regmap_write(backend
->engine
.regs
,
236 SUN4I_BACKEND_YGCOEF_REG(i
),
237 sunxi_bt601_yuv2rgb_coef
[i
]);
240 * We should do that only for a single plane, but the
241 * framebuffer's atomic_check has our back on this.
243 regmap_update_bits(backend
->engine
.regs
, SUN4I_BACKEND_ATTCTL_REG0(layer
),
244 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN
,
245 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN
);
247 /* TODO: Add support for the multi-planar YUV formats */
248 if (format
->num_planes
== 1)
249 val
|= SUN4I_BACKEND_IYUVCTL_FBFMT_PACKED_YUV422
;
251 DRM_DEBUG_DRIVER("Unsupported YUV format (0x%x)\n", fmt
);
254 * Allwinner seems to list the pixel sequence from right to left, while
255 * DRM lists it from left to right.
258 case DRM_FORMAT_YUYV
:
259 val
|= SUN4I_BACKEND_IYUVCTL_FBPS_VYUY
;
261 case DRM_FORMAT_YVYU
:
262 val
|= SUN4I_BACKEND_IYUVCTL_FBPS_UYVY
;
264 case DRM_FORMAT_UYVY
:
265 val
|= SUN4I_BACKEND_IYUVCTL_FBPS_YVYU
;
267 case DRM_FORMAT_VYUY
:
268 val
|= SUN4I_BACKEND_IYUVCTL_FBPS_YUYV
;
271 DRM_DEBUG_DRIVER("Unsupported YUV pixel sequence (0x%x)\n",
275 regmap_write(backend
->engine
.regs
, SUN4I_BACKEND_IYUVCTL_REG
, val
);
280 int sun4i_backend_update_layer_formats(struct sun4i_backend
*backend
,
281 int layer
, struct drm_plane
*plane
)
283 struct drm_plane_state
*state
= plane
->state
;
284 struct drm_framebuffer
*fb
= state
->fb
;
285 bool interlaced
= false;
289 /* Clear the YUV mode */
290 regmap_update_bits(backend
->engine
.regs
, SUN4I_BACKEND_ATTCTL_REG0(layer
),
291 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN
, 0);
293 if (plane
->state
->crtc
)
294 interlaced
= plane
->state
->crtc
->state
->adjusted_mode
.flags
295 & DRM_MODE_FLAG_INTERLACE
;
297 regmap_update_bits(backend
->engine
.regs
, SUN4I_BACKEND_MODCTL_REG
,
298 SUN4I_BACKEND_MODCTL_ITLMOD_EN
,
299 interlaced
? SUN4I_BACKEND_MODCTL_ITLMOD_EN
: 0);
301 DRM_DEBUG_DRIVER("Switching display backend interlaced mode %s\n",
302 interlaced
? "on" : "off");
304 val
= SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA(state
->alpha
>> 8);
305 if (state
->alpha
!= DRM_BLEND_ALPHA_OPAQUE
)
306 val
|= SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN
;
307 regmap_update_bits(backend
->engine
.regs
,
308 SUN4I_BACKEND_ATTCTL_REG0(layer
),
309 SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_MASK
|
310 SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN
,
313 if (fb
->format
->is_yuv
)
314 return sun4i_backend_update_yuv_format(backend
, layer
, plane
);
316 ret
= sun4i_backend_drm_format_to_layer(fb
->format
->format
, &val
);
318 DRM_DEBUG_DRIVER("Invalid format\n");
322 regmap_update_bits(backend
->engine
.regs
,
323 SUN4I_BACKEND_ATTCTL_REG1(layer
),
324 SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT
, val
);
329 int sun4i_backend_update_layer_frontend(struct sun4i_backend
*backend
,
330 int layer
, uint32_t fmt
)
335 ret
= sun4i_backend_drm_format_to_layer(fmt
, &val
);
337 DRM_DEBUG_DRIVER("Invalid format\n");
341 regmap_update_bits(backend
->engine
.regs
,
342 SUN4I_BACKEND_ATTCTL_REG0(layer
),
343 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN
,
344 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN
);
346 regmap_update_bits(backend
->engine
.regs
,
347 SUN4I_BACKEND_ATTCTL_REG1(layer
),
348 SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT
, val
);
353 static int sun4i_backend_update_yuv_buffer(struct sun4i_backend
*backend
,
354 struct drm_framebuffer
*fb
,
357 /* TODO: Add support for the multi-planar YUV formats */
358 DRM_DEBUG_DRIVER("Setting packed YUV buffer address to %pad\n", &paddr
);
359 regmap_write(backend
->engine
.regs
, SUN4I_BACKEND_IYUVADD_REG(0), paddr
);
361 DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb
->pitches
[0] * 8);
362 regmap_write(backend
->engine
.regs
, SUN4I_BACKEND_IYUVLINEWIDTH_REG(0),
368 int sun4i_backend_update_layer_buffer(struct sun4i_backend
*backend
,
369 int layer
, struct drm_plane
*plane
)
371 struct drm_plane_state
*state
= plane
->state
;
372 struct drm_framebuffer
*fb
= state
->fb
;
373 u32 lo_paddr
, hi_paddr
;
376 /* Set the line width */
377 DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb
->pitches
[0] * 8);
378 regmap_write(backend
->engine
.regs
,
379 SUN4I_BACKEND_LAYLINEWIDTH_REG(layer
),
382 /* Get the start of the displayed memory */
383 paddr
= drm_fb_cma_get_gem_addr(fb
, state
, 0);
384 DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr
);
387 * backend DMA accesses DRAM directly, bypassing the system
388 * bus. As such, the address range is different and the buffer
389 * address needs to be corrected.
391 paddr
-= PHYS_OFFSET
;
393 if (fb
->format
->is_yuv
)
394 return sun4i_backend_update_yuv_buffer(backend
, fb
, paddr
);
396 /* Write the 32 lower bits of the address (in bits) */
397 lo_paddr
= paddr
<< 3;
398 DRM_DEBUG_DRIVER("Setting address lower bits to 0x%x\n", lo_paddr
);
399 regmap_write(backend
->engine
.regs
,
400 SUN4I_BACKEND_LAYFB_L32ADD_REG(layer
),
403 /* And the upper bits */
404 hi_paddr
= paddr
>> 29;
405 DRM_DEBUG_DRIVER("Setting address high bits to 0x%x\n", hi_paddr
);
406 regmap_update_bits(backend
->engine
.regs
, SUN4I_BACKEND_LAYFB_H4ADD_REG
,
407 SUN4I_BACKEND_LAYFB_H4ADD_MSK(layer
),
408 SUN4I_BACKEND_LAYFB_H4ADD(layer
, hi_paddr
));
413 int sun4i_backend_update_layer_zpos(struct sun4i_backend
*backend
, int layer
,
414 struct drm_plane
*plane
)
416 struct drm_plane_state
*state
= plane
->state
;
417 struct sun4i_layer_state
*p_state
= state_to_sun4i_layer_state(state
);
418 unsigned int priority
= state
->normalized_zpos
;
419 unsigned int pipe
= p_state
->pipe
;
421 DRM_DEBUG_DRIVER("Setting layer %d's priority to %d and pipe %d\n",
422 layer
, priority
, pipe
);
423 regmap_update_bits(backend
->engine
.regs
, SUN4I_BACKEND_ATTCTL_REG0(layer
),
424 SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL_MASK
|
425 SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL_MASK
,
426 SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL(p_state
->pipe
) |
427 SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL(priority
));
432 void sun4i_backend_cleanup_layer(struct sun4i_backend
*backend
,
435 regmap_update_bits(backend
->engine
.regs
,
436 SUN4I_BACKEND_ATTCTL_REG0(layer
),
437 SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN
|
438 SUN4I_BACKEND_ATTCTL_REG0_LAY_YUVEN
, 0);
441 static bool sun4i_backend_plane_uses_scaler(struct drm_plane_state
*state
)
443 u16 src_h
= state
->src_h
>> 16;
444 u16 src_w
= state
->src_w
>> 16;
446 DRM_DEBUG_DRIVER("Input size %dx%d, output size %dx%d\n",
447 src_w
, src_h
, state
->crtc_w
, state
->crtc_h
);
449 if ((state
->crtc_h
!= src_h
) || (state
->crtc_w
!= src_w
))
455 static bool sun4i_backend_plane_uses_frontend(struct drm_plane_state
*state
)
457 struct sun4i_layer
*layer
= plane_to_sun4i_layer(state
->plane
);
458 struct sun4i_backend
*backend
= layer
->backend
;
459 uint32_t format
= state
->fb
->format
->format
;
460 uint64_t modifier
= state
->fb
->modifier
;
462 if (IS_ERR(backend
->frontend
))
465 if (!sun4i_frontend_format_is_supported(format
, modifier
))
468 if (!sun4i_backend_format_is_supported(format
, modifier
))
472 * TODO: The backend alone allows 2x and 4x integer scaling, including
473 * support for an alpha component (which the frontend doesn't support).
474 * Use the backend directly instead of the frontend in this case, with
475 * another test to return false.
478 if (sun4i_backend_plane_uses_scaler(state
))
482 * Here the format is supported by both the frontend and the backend
483 * and no frontend scaling is required, so use the backend directly.
488 static bool sun4i_backend_plane_is_supported(struct drm_plane_state
*state
,
491 if (sun4i_backend_plane_uses_frontend(state
)) {
492 *uses_frontend
= true;
496 *uses_frontend
= false;
498 /* Scaling is not supported without the frontend. */
499 if (sun4i_backend_plane_uses_scaler(state
))
505 static void sun4i_backend_atomic_begin(struct sunxi_engine
*engine
,
506 struct drm_crtc_state
*old_state
)
510 WARN_ON(regmap_read_poll_timeout(engine
->regs
,
511 SUN4I_BACKEND_REGBUFFCTL_REG
,
512 val
, !(val
& SUN4I_BACKEND_REGBUFFCTL_LOADCTL
),
516 static int sun4i_backend_atomic_check(struct sunxi_engine
*engine
,
517 struct drm_crtc_state
*crtc_state
)
519 struct drm_plane_state
*plane_states
[SUN4I_BACKEND_NUM_LAYERS
] = { 0 };
520 struct sun4i_backend
*backend
= engine_to_sun4i_backend(engine
);
521 struct drm_atomic_state
*state
= crtc_state
->state
;
522 struct drm_device
*drm
= state
->dev
;
523 struct drm_plane
*plane
;
524 unsigned int num_planes
= 0;
525 unsigned int num_alpha_planes
= 0;
526 unsigned int num_frontend_planes
= 0;
527 unsigned int num_alpha_planes_max
= 1;
528 unsigned int num_yuv_planes
= 0;
529 unsigned int current_pipe
= 0;
532 DRM_DEBUG_DRIVER("Starting checking our planes\n");
534 if (!crtc_state
->planes_changed
)
537 drm_for_each_plane_mask(plane
, drm
, crtc_state
->plane_mask
) {
538 struct drm_plane_state
*plane_state
=
539 drm_atomic_get_plane_state(state
, plane
);
540 struct sun4i_layer_state
*layer_state
=
541 state_to_sun4i_layer_state(plane_state
);
542 struct drm_framebuffer
*fb
= plane_state
->fb
;
543 struct drm_format_name_buf format_name
;
545 if (!sun4i_backend_plane_is_supported(plane_state
,
546 &layer_state
->uses_frontend
))
549 if (layer_state
->uses_frontend
) {
550 DRM_DEBUG_DRIVER("Using the frontend for plane %d\n",
552 num_frontend_planes
++;
554 if (fb
->format
->is_yuv
) {
555 DRM_DEBUG_DRIVER("Plane FB format is YUV\n");
560 DRM_DEBUG_DRIVER("Plane FB format is %s\n",
561 drm_get_format_name(fb
->format
->format
,
563 if (fb
->format
->has_alpha
|| (plane_state
->alpha
!= DRM_BLEND_ALPHA_OPAQUE
))
566 DRM_DEBUG_DRIVER("Plane zpos is %d\n",
567 plane_state
->normalized_zpos
);
569 /* Sort our planes by Zpos */
570 plane_states
[plane_state
->normalized_zpos
] = plane_state
;
575 /* All our planes were disabled, bail out */
580 * The hardware is a bit unusual here.
582 * Even though it supports 4 layers, it does the composition
583 * in two separate steps.
585 * The first one is assigning a layer to one of its two
586 * pipes. If more that 1 layer is assigned to the same pipe,
587 * and if pixels overlaps, the pipe will take the pixel from
588 * the layer with the highest priority.
590 * The second step is the actual alpha blending, that takes
591 * the two pipes as input, and uses the potential alpha
592 * component to do the transparency between the two.
594 * This two-step scenario makes us unable to guarantee a
595 * robust alpha blending between the 4 layers in all
596 * situations, since this means that we need to have one layer
597 * with alpha at the lowest position of our two pipes.
599 * However, we cannot even do that on every platform, since
600 * the hardware has a bug where the lowest plane of the lowest
601 * pipe (pipe 0, priority 0), if it has any alpha, will
602 * discard the pixel data entirely and just display the pixels
603 * in the background color (black by default).
605 * This means that on the affected platforms, we effectively
606 * have only three valid configurations with alpha, all of
607 * them with the alpha being on pipe1 with the lowest
608 * position, which can be 1, 2 or 3 depending on the number of
609 * planes and their zpos.
612 /* For platforms that are not affected by the issue described above. */
613 if (backend
->quirks
->supports_lowest_plane_alpha
)
614 num_alpha_planes_max
++;
616 if (num_alpha_planes
> num_alpha_planes_max
) {
617 DRM_DEBUG_DRIVER("Too many planes with alpha, rejecting...\n");
621 /* We can't have an alpha plane at the lowest position */
622 if (!backend
->quirks
->supports_lowest_plane_alpha
&&
623 (plane_states
[0]->fb
->format
->has_alpha
||
624 (plane_states
[0]->alpha
!= DRM_BLEND_ALPHA_OPAQUE
)))
627 for (i
= 1; i
< num_planes
; i
++) {
628 struct drm_plane_state
*p_state
= plane_states
[i
];
629 struct drm_framebuffer
*fb
= p_state
->fb
;
630 struct sun4i_layer_state
*s_state
= state_to_sun4i_layer_state(p_state
);
633 * The only alpha position is the lowest plane of the
636 if (fb
->format
->has_alpha
|| (p_state
->alpha
!= DRM_BLEND_ALPHA_OPAQUE
))
639 s_state
->pipe
= current_pipe
;
642 /* We can only have a single YUV plane at a time */
643 if (num_yuv_planes
> SUN4I_BACKEND_NUM_YUV_PLANES
) {
644 DRM_DEBUG_DRIVER("Too many planes with YUV, rejecting...\n");
648 if (num_frontend_planes
> SUN4I_BACKEND_NUM_FRONTEND_LAYERS
) {
649 DRM_DEBUG_DRIVER("Too many planes going through the frontend, rejecting\n");
653 DRM_DEBUG_DRIVER("State valid with %u planes, %u alpha, %u video, %u YUV\n",
654 num_planes
, num_alpha_planes
, num_frontend_planes
,
660 static void sun4i_backend_vblank_quirk(struct sunxi_engine
*engine
)
662 struct sun4i_backend
*backend
= engine_to_sun4i_backend(engine
);
663 struct sun4i_frontend
*frontend
= backend
->frontend
;
669 * In a teardown scenario with the frontend involved, we have
670 * to keep the frontend enabled until the next vblank, and
671 * only then disable it.
673 * This is due to the fact that the backend will not take into
674 * account the new configuration (with the plane that used to
675 * be fed by the frontend now disabled) until we write to the
676 * commit bit and the hardware fetches the new configuration
677 * during the next vblank.
679 * So we keep the frontend around in order to prevent any
682 spin_lock(&backend
->frontend_lock
);
683 if (backend
->frontend_teardown
) {
684 sun4i_frontend_exit(frontend
);
685 backend
->frontend_teardown
= false;
687 spin_unlock(&backend
->frontend_lock
);
690 static int sun4i_backend_init_sat(struct device
*dev
) {
691 struct sun4i_backend
*backend
= dev_get_drvdata(dev
);
694 backend
->sat_reset
= devm_reset_control_get(dev
, "sat");
695 if (IS_ERR(backend
->sat_reset
)) {
696 dev_err(dev
, "Couldn't get the SAT reset line\n");
697 return PTR_ERR(backend
->sat_reset
);
700 ret
= reset_control_deassert(backend
->sat_reset
);
702 dev_err(dev
, "Couldn't deassert the SAT reset line\n");
706 backend
->sat_clk
= devm_clk_get(dev
, "sat");
707 if (IS_ERR(backend
->sat_clk
)) {
708 dev_err(dev
, "Couldn't get our SAT clock\n");
709 ret
= PTR_ERR(backend
->sat_clk
);
710 goto err_assert_reset
;
713 ret
= clk_prepare_enable(backend
->sat_clk
);
715 dev_err(dev
, "Couldn't enable the SAT clock\n");
722 reset_control_assert(backend
->sat_reset
);
726 static int sun4i_backend_free_sat(struct device
*dev
) {
727 struct sun4i_backend
*backend
= dev_get_drvdata(dev
);
729 clk_disable_unprepare(backend
->sat_clk
);
730 reset_control_assert(backend
->sat_reset
);
736 * The display backend can take video output from the display frontend, or
737 * the display enhancement unit on the A80, as input for one it its layers.
738 * This relationship within the display pipeline is encoded in the device
739 * tree with of_graph, and we use it here to figure out which backend, if
740 * there are 2 or more, we are currently probing. The number would be in
741 * the "reg" property of the upstream output port endpoint.
743 static int sun4i_backend_of_get_id(struct device_node
*node
)
745 struct device_node
*port
, *ep
;
748 /* input is port 0 */
749 port
= of_graph_get_port_by_id(node
, 0);
753 /* try finding an upstream endpoint */
754 for_each_available_child_of_node(port
, ep
) {
755 struct device_node
*remote
;
758 remote
= of_graph_get_remote_endpoint(ep
);
762 ret
= of_property_read_u32(remote
, "reg", ®
);
774 /* TODO: This needs to take multiple pipelines into account */
775 static struct sun4i_frontend
*sun4i_backend_find_frontend(struct sun4i_drv
*drv
,
776 struct device_node
*node
)
778 struct device_node
*port
, *ep
, *remote
;
779 struct sun4i_frontend
*frontend
;
781 port
= of_graph_get_port_by_id(node
, 0);
783 return ERR_PTR(-EINVAL
);
785 for_each_available_child_of_node(port
, ep
) {
786 remote
= of_graph_get_remote_port_parent(ep
);
790 /* does this node match any registered engines? */
791 list_for_each_entry(frontend
, &drv
->frontend_list
, list
) {
792 if (remote
== frontend
->node
) {
800 return ERR_PTR(-EINVAL
);
803 static const struct sunxi_engine_ops sun4i_backend_engine_ops
= {
804 .atomic_begin
= sun4i_backend_atomic_begin
,
805 .atomic_check
= sun4i_backend_atomic_check
,
806 .commit
= sun4i_backend_commit
,
807 .layers_init
= sun4i_layers_init
,
808 .apply_color_correction
= sun4i_backend_apply_color_correction
,
809 .disable_color_correction
= sun4i_backend_disable_color_correction
,
810 .vblank_quirk
= sun4i_backend_vblank_quirk
,
813 static struct regmap_config sun4i_backend_regmap_config
= {
817 .max_register
= 0x5800,
820 static int sun4i_backend_bind(struct device
*dev
, struct device
*master
,
823 struct platform_device
*pdev
= to_platform_device(dev
);
824 struct drm_device
*drm
= data
;
825 struct sun4i_drv
*drv
= drm
->dev_private
;
826 struct sun4i_backend
*backend
;
827 const struct sun4i_backend_quirks
*quirks
;
828 struct resource
*res
;
832 backend
= devm_kzalloc(dev
, sizeof(*backend
), GFP_KERNEL
);
835 dev_set_drvdata(dev
, backend
);
836 spin_lock_init(&backend
->frontend_lock
);
838 backend
->engine
.node
= dev
->of_node
;
839 backend
->engine
.ops
= &sun4i_backend_engine_ops
;
840 backend
->engine
.id
= sun4i_backend_of_get_id(dev
->of_node
);
841 if (backend
->engine
.id
< 0)
842 return backend
->engine
.id
;
844 backend
->frontend
= sun4i_backend_find_frontend(drv
, dev
->of_node
);
845 if (IS_ERR(backend
->frontend
))
846 dev_warn(dev
, "Couldn't find matching frontend, frontend features disabled\n");
848 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
849 regs
= devm_ioremap_resource(dev
, res
);
851 return PTR_ERR(regs
);
853 backend
->reset
= devm_reset_control_get(dev
, NULL
);
854 if (IS_ERR(backend
->reset
)) {
855 dev_err(dev
, "Couldn't get our reset line\n");
856 return PTR_ERR(backend
->reset
);
859 ret
= reset_control_deassert(backend
->reset
);
861 dev_err(dev
, "Couldn't deassert our reset line\n");
865 backend
->bus_clk
= devm_clk_get(dev
, "ahb");
866 if (IS_ERR(backend
->bus_clk
)) {
867 dev_err(dev
, "Couldn't get the backend bus clock\n");
868 ret
= PTR_ERR(backend
->bus_clk
);
869 goto err_assert_reset
;
871 clk_prepare_enable(backend
->bus_clk
);
873 backend
->mod_clk
= devm_clk_get(dev
, "mod");
874 if (IS_ERR(backend
->mod_clk
)) {
875 dev_err(dev
, "Couldn't get the backend module clock\n");
876 ret
= PTR_ERR(backend
->mod_clk
);
877 goto err_disable_bus_clk
;
879 clk_prepare_enable(backend
->mod_clk
);
881 backend
->ram_clk
= devm_clk_get(dev
, "ram");
882 if (IS_ERR(backend
->ram_clk
)) {
883 dev_err(dev
, "Couldn't get the backend RAM clock\n");
884 ret
= PTR_ERR(backend
->ram_clk
);
885 goto err_disable_mod_clk
;
887 clk_prepare_enable(backend
->ram_clk
);
889 if (of_device_is_compatible(dev
->of_node
,
890 "allwinner,sun8i-a33-display-backend")) {
891 ret
= sun4i_backend_init_sat(dev
);
893 dev_err(dev
, "Couldn't init SAT resources\n");
894 goto err_disable_ram_clk
;
898 backend
->engine
.regs
= devm_regmap_init_mmio(dev
, regs
,
899 &sun4i_backend_regmap_config
);
900 if (IS_ERR(backend
->engine
.regs
)) {
901 dev_err(dev
, "Couldn't create the backend regmap\n");
902 return PTR_ERR(backend
->engine
.regs
);
905 list_add_tail(&backend
->engine
.list
, &drv
->engine_list
);
908 * Many of the backend's layer configuration registers have
909 * undefined default values. This poses a risk as we use
910 * regmap_update_bits in some places, and don't overwrite
911 * the whole register.
913 * Clear the registers here to have something predictable.
915 for (i
= 0x800; i
< 0x1000; i
+= 4)
916 regmap_write(backend
->engine
.regs
, i
, 0);
918 /* Disable registers autoloading */
919 regmap_write(backend
->engine
.regs
, SUN4I_BACKEND_REGBUFFCTL_REG
,
920 SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS
);
922 /* Enable the backend */
923 regmap_write(backend
->engine
.regs
, SUN4I_BACKEND_MODCTL_REG
,
924 SUN4I_BACKEND_MODCTL_DEBE_EN
|
925 SUN4I_BACKEND_MODCTL_START_CTL
);
927 /* Set output selection if needed */
928 quirks
= of_device_get_match_data(dev
);
929 if (quirks
->needs_output_muxing
) {
931 * We assume there is no dynamic muxing of backends
932 * and TCONs, so we select the backend with same ID.
934 * While dynamic selection might be interesting, since
935 * the CRTC is tied to the TCON, while the layers are
936 * tied to the backends, this means, we will need to
937 * switch between groups of layers. There might not be
938 * a way to represent this constraint in DRM.
940 regmap_update_bits(backend
->engine
.regs
,
941 SUN4I_BACKEND_MODCTL_REG
,
942 SUN4I_BACKEND_MODCTL_OUT_SEL
,
944 ? SUN4I_BACKEND_MODCTL_OUT_LCD1
945 : SUN4I_BACKEND_MODCTL_OUT_LCD0
));
948 backend
->quirks
= quirks
;
953 clk_disable_unprepare(backend
->ram_clk
);
955 clk_disable_unprepare(backend
->mod_clk
);
957 clk_disable_unprepare(backend
->bus_clk
);
959 reset_control_assert(backend
->reset
);
963 static void sun4i_backend_unbind(struct device
*dev
, struct device
*master
,
966 struct sun4i_backend
*backend
= dev_get_drvdata(dev
);
968 list_del(&backend
->engine
.list
);
970 if (of_device_is_compatible(dev
->of_node
,
971 "allwinner,sun8i-a33-display-backend"))
972 sun4i_backend_free_sat(dev
);
974 clk_disable_unprepare(backend
->ram_clk
);
975 clk_disable_unprepare(backend
->mod_clk
);
976 clk_disable_unprepare(backend
->bus_clk
);
977 reset_control_assert(backend
->reset
);
980 static const struct component_ops sun4i_backend_ops
= {
981 .bind
= sun4i_backend_bind
,
982 .unbind
= sun4i_backend_unbind
,
985 static int sun4i_backend_probe(struct platform_device
*pdev
)
987 return component_add(&pdev
->dev
, &sun4i_backend_ops
);
990 static int sun4i_backend_remove(struct platform_device
*pdev
)
992 component_del(&pdev
->dev
, &sun4i_backend_ops
);
997 static const struct sun4i_backend_quirks sun4i_backend_quirks
= {
998 .needs_output_muxing
= true,
1001 static const struct sun4i_backend_quirks sun5i_backend_quirks
= {
1004 static const struct sun4i_backend_quirks sun6i_backend_quirks
= {
1007 static const struct sun4i_backend_quirks sun7i_backend_quirks
= {
1008 .needs_output_muxing
= true,
1009 .supports_lowest_plane_alpha
= true,
1012 static const struct sun4i_backend_quirks sun8i_a33_backend_quirks
= {
1013 .supports_lowest_plane_alpha
= true,
1016 static const struct sun4i_backend_quirks sun9i_backend_quirks
= {
1019 static const struct of_device_id sun4i_backend_of_table
[] = {
1021 .compatible
= "allwinner,sun4i-a10-display-backend",
1022 .data
= &sun4i_backend_quirks
,
1025 .compatible
= "allwinner,sun5i-a13-display-backend",
1026 .data
= &sun5i_backend_quirks
,
1029 .compatible
= "allwinner,sun6i-a31-display-backend",
1030 .data
= &sun6i_backend_quirks
,
1033 .compatible
= "allwinner,sun7i-a20-display-backend",
1034 .data
= &sun7i_backend_quirks
,
1037 .compatible
= "allwinner,sun8i-a33-display-backend",
1038 .data
= &sun8i_a33_backend_quirks
,
1041 .compatible
= "allwinner,sun9i-a80-display-backend",
1042 .data
= &sun9i_backend_quirks
,
1046 MODULE_DEVICE_TABLE(of
, sun4i_backend_of_table
);
1048 static struct platform_driver sun4i_backend_platform_driver
= {
1049 .probe
= sun4i_backend_probe
,
1050 .remove
= sun4i_backend_remove
,
1052 .name
= "sun4i-backend",
1053 .of_match_table
= sun4i_backend_of_table
,
1056 module_platform_driver(sun4i_backend_platform_driver
);
1058 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
1059 MODULE_DESCRIPTION("Allwinner A10 Display Backend Driver");
1060 MODULE_LICENSE("GPL");