--- /dev/null
+From 877feb15a17353699d35bd7ff45dca84a75f115c Mon Sep 17 00:00:00 2001
+From: Sasha Levin <sashal@kernel.org>
+Date: Fri, 23 Dec 2022 15:05:08 +0200
+Subject: drm/i915/mtl: limit second scaler vertical scaling in ver >= 14
+
+From: Luca Coelho <luciano.coelho@intel.com>
+
+[ Upstream commit 8d4312e2b228ba7a5ac79154458098274ec61e9b ]
+
+In newer hardware versions (i.e. display version >= 14), the second
+scaler doesn't support vertical scaling.
+
+The current implementation of the scaling limits is simplified and
+only occurs when the planes are created, so we don't know which scaler
+is being used.
+
+In order to handle separate scaling limits for horizontal and vertical
+scaling, and different limits per scaler, split the checks in two
+phases. We first do a simple check during plane creation and use the
+best-case scenario (because we don't know the scaler that may be used
+at a later point) and then do a more specific check when the scalers
+are actually being set up.
+
+Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
+Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
+Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
+Link: https://patchwork.freedesktop.org/patch/msgid/20221223130509.43245-2-luciano.coelho@intel.com
+Stable-dep-of: c3070f080f9b ("drm/i915: Fix intel_atomic_setup_scalers() plane_state handling")
+Signed-off-by: Sasha Levin <sashal@kernel.org>
+---
+ drivers/gpu/drm/i915/display/intel_atomic.c | 85 ++++++++++++++++++---
+ 1 file changed, 75 insertions(+), 10 deletions(-)
+
+diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
+index 18f0a5ae3bacd..61dda54d68e0a 100644
+--- a/drivers/gpu/drm/i915/display/intel_atomic.c
++++ b/drivers/gpu/drm/i915/display/intel_atomic.c
+@@ -41,6 +41,7 @@
+ #include "intel_global_state.h"
+ #include "intel_hdcp.h"
+ #include "intel_psr.h"
++#include "intel_fb.h"
+ #include "skl_universal_plane.h"
+
+ /**
+@@ -302,11 +303,11 @@ intel_crtc_destroy_state(struct drm_crtc *crtc,
+ kfree(crtc_state);
+ }
+
+-static void intel_atomic_setup_scaler(struct intel_crtc_scaler_state *scaler_state,
+- int num_scalers_need, struct intel_crtc *intel_crtc,
+- const char *name, int idx,
+- struct intel_plane_state *plane_state,
+- int *scaler_id)
++static int intel_atomic_setup_scaler(struct intel_crtc_scaler_state *scaler_state,
++ int num_scalers_need, struct intel_crtc *intel_crtc,
++ const char *name, int idx,
++ struct intel_plane_state *plane_state,
++ int *scaler_id)
+ {
+ struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
+ int j;
+@@ -326,7 +327,7 @@ static void intel_atomic_setup_scaler(struct intel_crtc_scaler_state *scaler_sta
+
+ if (drm_WARN(&dev_priv->drm, *scaler_id < 0,
+ "Cannot find scaler for %s:%d\n", name, idx))
+- return;
++ return -EINVAL;
+
+ /* set scaler mode */
+ if (plane_state && plane_state->hw.fb &&
+@@ -367,9 +368,71 @@ static void intel_atomic_setup_scaler(struct intel_crtc_scaler_state *scaler_sta
+ mode = SKL_PS_SCALER_MODE_DYN;
+ }
+
++ /*
++ * FIXME: we should also check the scaler factors for pfit, so
++ * this shouldn't be tied directly to planes.
++ */
++ if (plane_state && plane_state->hw.fb) {
++ const struct drm_framebuffer *fb = plane_state->hw.fb;
++ const struct drm_rect *src = &plane_state->uapi.src;
++ const struct drm_rect *dst = &plane_state->uapi.dst;
++ int hscale, vscale, max_vscale, max_hscale;
++
++ /*
++ * FIXME: When two scalers are needed, but only one of
++ * them needs to downscale, we should make sure that
++ * the one that needs downscaling support is assigned
++ * as the first scaler, so we don't reject downscaling
++ * unnecessarily.
++ */
++
++ if (DISPLAY_VER(dev_priv) >= 14) {
++ /*
++ * On versions 14 and up, only the first
++ * scaler supports a vertical scaling factor
++ * of more than 1.0, while a horizontal
++ * scaling factor of 3.0 is supported.
++ */
++ max_hscale = 0x30000 - 1;
++ if (*scaler_id == 0)
++ max_vscale = 0x30000 - 1;
++ else
++ max_vscale = 0x10000;
++
++ } else if (DISPLAY_VER(dev_priv) >= 10 ||
++ !intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier)) {
++ max_hscale = 0x30000 - 1;
++ max_vscale = 0x30000 - 1;
++ } else {
++ max_hscale = 0x20000 - 1;
++ max_vscale = 0x20000 - 1;
++ }
++
++ /*
++ * FIXME: We should change the if-else block above to
++ * support HQ vs dynamic scaler properly.
++ */
++
++ /* Check if required scaling is within limits */
++ hscale = drm_rect_calc_hscale(src, dst, 1, max_hscale);
++ vscale = drm_rect_calc_vscale(src, dst, 1, max_vscale);
++
++ if (hscale < 0 || vscale < 0) {
++ drm_dbg_kms(&dev_priv->drm,
++ "Scaler %d doesn't support required plane scaling\n",
++ *scaler_id);
++ drm_rect_debug_print("src: ", src, true);
++ drm_rect_debug_print("dst: ", dst, false);
++
++ return -EINVAL;
++ }
++ }
++
+ drm_dbg_kms(&dev_priv->drm, "Attached scaler id %u.%u to %s:%d\n",
+ intel_crtc->pipe, *scaler_id, name, idx);
+ scaler_state->scalers[*scaler_id].mode = mode;
++
++ return 0;
+ }
+
+ /**
+@@ -429,7 +492,7 @@ int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
+ for (i = 0; i < sizeof(scaler_state->scaler_users) * 8; i++) {
+ int *scaler_id;
+ const char *name;
+- int idx;
++ int idx, ret;
+
+ /* skip if scaler not required */
+ if (!(scaler_state->scaler_users & (1 << i)))
+@@ -486,9 +549,11 @@ int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
+ scaler_id = &plane_state->scaler_id;
+ }
+
+- intel_atomic_setup_scaler(scaler_state, num_scalers_need,
+- intel_crtc, name, idx,
+- plane_state, scaler_id);
++ ret = intel_atomic_setup_scaler(scaler_state, num_scalers_need,
++ intel_crtc, name, idx,
++ plane_state, scaler_id);
++ if (ret < 0)
++ return ret;
+ }
+
+ return 0;
+--
+2.43.0
+
--- /dev/null
+From 46395ae5d99059a0a311608606ed3f228ae2d6e6 Mon Sep 17 00:00:00 2001
+From: Sasha Levin <sashal@kernel.org>
+Date: Tue, 18 Apr 2023 20:55:16 +0300
+Subject: drm/i915: Relocate intel_atomic_setup_scalers()
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+From: Ville Syrjälä <ville.syrjala@linux.intel.com>
+
+[ Upstream commit 8976b18249407df8bf6ea18ecae0640a15341a50 ]
+
+Move intel_atomic_setup_scalers() next to the other scaler
+code in skl_scaler.c.
+
+Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
+Link: https://patchwork.freedesktop.org/patch/msgid/20230418175528.13117-4-ville.syrjala@linux.intel.com
+Reviewed-by: Jani Nikula <jani.nikula@intel.com>
+Stable-dep-of: c3070f080f9b ("drm/i915: Fix intel_atomic_setup_scalers() plane_state handling")
+Signed-off-by: Sasha Levin <sashal@kernel.org>
+---
+ drivers/gpu/drm/i915/display/intel_atomic.c | 256 -------------------
+ drivers/gpu/drm/i915/display/intel_atomic.h | 4 -
+ drivers/gpu/drm/i915/display/skl_scaler.c | 257 ++++++++++++++++++++
+ drivers/gpu/drm/i915/display/skl_scaler.h | 10 +-
+ 4 files changed, 265 insertions(+), 262 deletions(-)
+
+diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
+index 61dda54d68e0a..a502af0b6dd47 100644
+--- a/drivers/gpu/drm/i915/display/intel_atomic.c
++++ b/drivers/gpu/drm/i915/display/intel_atomic.c
+@@ -303,262 +303,6 @@ intel_crtc_destroy_state(struct drm_crtc *crtc,
+ kfree(crtc_state);
+ }
+
+-static int intel_atomic_setup_scaler(struct intel_crtc_scaler_state *scaler_state,
+- int num_scalers_need, struct intel_crtc *intel_crtc,
+- const char *name, int idx,
+- struct intel_plane_state *plane_state,
+- int *scaler_id)
+-{
+- struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
+- int j;
+- u32 mode;
+-
+- if (*scaler_id < 0) {
+- /* find a free scaler */
+- for (j = 0; j < intel_crtc->num_scalers; j++) {
+- if (scaler_state->scalers[j].in_use)
+- continue;
+-
+- *scaler_id = j;
+- scaler_state->scalers[*scaler_id].in_use = 1;
+- break;
+- }
+- }
+-
+- if (drm_WARN(&dev_priv->drm, *scaler_id < 0,
+- "Cannot find scaler for %s:%d\n", name, idx))
+- return -EINVAL;
+-
+- /* set scaler mode */
+- if (plane_state && plane_state->hw.fb &&
+- plane_state->hw.fb->format->is_yuv &&
+- plane_state->hw.fb->format->num_planes > 1) {
+- struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
+- if (DISPLAY_VER(dev_priv) == 9) {
+- mode = SKL_PS_SCALER_MODE_NV12;
+- } else if (icl_is_hdr_plane(dev_priv, plane->id)) {
+- /*
+- * On gen11+'s HDR planes we only use the scaler for
+- * scaling. They have a dedicated chroma upsampler, so
+- * we don't need the scaler to upsample the UV plane.
+- */
+- mode = PS_SCALER_MODE_NORMAL;
+- } else {
+- struct intel_plane *linked =
+- plane_state->planar_linked_plane;
+-
+- mode = PS_SCALER_MODE_PLANAR;
+-
+- if (linked)
+- mode |= PS_PLANE_Y_SEL(linked->id);
+- }
+- } else if (DISPLAY_VER(dev_priv) >= 10) {
+- mode = PS_SCALER_MODE_NORMAL;
+- } else if (num_scalers_need == 1 && intel_crtc->num_scalers > 1) {
+- /*
+- * when only 1 scaler is in use on a pipe with 2 scalers
+- * scaler 0 operates in high quality (HQ) mode.
+- * In this case use scaler 0 to take advantage of HQ mode
+- */
+- scaler_state->scalers[*scaler_id].in_use = 0;
+- *scaler_id = 0;
+- scaler_state->scalers[0].in_use = 1;
+- mode = SKL_PS_SCALER_MODE_HQ;
+- } else {
+- mode = SKL_PS_SCALER_MODE_DYN;
+- }
+-
+- /*
+- * FIXME: we should also check the scaler factors for pfit, so
+- * this shouldn't be tied directly to planes.
+- */
+- if (plane_state && plane_state->hw.fb) {
+- const struct drm_framebuffer *fb = plane_state->hw.fb;
+- const struct drm_rect *src = &plane_state->uapi.src;
+- const struct drm_rect *dst = &plane_state->uapi.dst;
+- int hscale, vscale, max_vscale, max_hscale;
+-
+- /*
+- * FIXME: When two scalers are needed, but only one of
+- * them needs to downscale, we should make sure that
+- * the one that needs downscaling support is assigned
+- * as the first scaler, so we don't reject downscaling
+- * unnecessarily.
+- */
+-
+- if (DISPLAY_VER(dev_priv) >= 14) {
+- /*
+- * On versions 14 and up, only the first
+- * scaler supports a vertical scaling factor
+- * of more than 1.0, while a horizontal
+- * scaling factor of 3.0 is supported.
+- */
+- max_hscale = 0x30000 - 1;
+- if (*scaler_id == 0)
+- max_vscale = 0x30000 - 1;
+- else
+- max_vscale = 0x10000;
+-
+- } else if (DISPLAY_VER(dev_priv) >= 10 ||
+- !intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier)) {
+- max_hscale = 0x30000 - 1;
+- max_vscale = 0x30000 - 1;
+- } else {
+- max_hscale = 0x20000 - 1;
+- max_vscale = 0x20000 - 1;
+- }
+-
+- /*
+- * FIXME: We should change the if-else block above to
+- * support HQ vs dynamic scaler properly.
+- */
+-
+- /* Check if required scaling is within limits */
+- hscale = drm_rect_calc_hscale(src, dst, 1, max_hscale);
+- vscale = drm_rect_calc_vscale(src, dst, 1, max_vscale);
+-
+- if (hscale < 0 || vscale < 0) {
+- drm_dbg_kms(&dev_priv->drm,
+- "Scaler %d doesn't support required plane scaling\n",
+- *scaler_id);
+- drm_rect_debug_print("src: ", src, true);
+- drm_rect_debug_print("dst: ", dst, false);
+-
+- return -EINVAL;
+- }
+- }
+-
+- drm_dbg_kms(&dev_priv->drm, "Attached scaler id %u.%u to %s:%d\n",
+- intel_crtc->pipe, *scaler_id, name, idx);
+- scaler_state->scalers[*scaler_id].mode = mode;
+-
+- return 0;
+-}
+-
+-/**
+- * intel_atomic_setup_scalers() - setup scalers for crtc per staged requests
+- * @dev_priv: i915 device
+- * @intel_crtc: intel crtc
+- * @crtc_state: incoming crtc_state to validate and setup scalers
+- *
+- * This function sets up scalers based on staged scaling requests for
+- * a @crtc and its planes. It is called from crtc level check path. If request
+- * is a supportable request, it attaches scalers to requested planes and crtc.
+- *
+- * This function takes into account the current scaler(s) in use by any planes
+- * not being part of this atomic state
+- *
+- * Returns:
+- * 0 - scalers were setup succesfully
+- * error code - otherwise
+- */
+-int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
+- struct intel_crtc *intel_crtc,
+- struct intel_crtc_state *crtc_state)
+-{
+- struct drm_plane *plane = NULL;
+- struct intel_plane *intel_plane;
+- struct intel_plane_state *plane_state = NULL;
+- struct intel_crtc_scaler_state *scaler_state =
+- &crtc_state->scaler_state;
+- struct drm_atomic_state *drm_state = crtc_state->uapi.state;
+- struct intel_atomic_state *intel_state = to_intel_atomic_state(drm_state);
+- int num_scalers_need;
+- int i;
+-
+- num_scalers_need = hweight32(scaler_state->scaler_users);
+-
+- /*
+- * High level flow:
+- * - staged scaler requests are already in scaler_state->scaler_users
+- * - check whether staged scaling requests can be supported
+- * - add planes using scalers that aren't in current transaction
+- * - assign scalers to requested users
+- * - as part of plane commit, scalers will be committed
+- * (i.e., either attached or detached) to respective planes in hw
+- * - as part of crtc_commit, scaler will be either attached or detached
+- * to crtc in hw
+- */
+-
+- /* fail if required scalers > available scalers */
+- if (num_scalers_need > intel_crtc->num_scalers){
+- drm_dbg_kms(&dev_priv->drm,
+- "Too many scaling requests %d > %d\n",
+- num_scalers_need, intel_crtc->num_scalers);
+- return -EINVAL;
+- }
+-
+- /* walkthrough scaler_users bits and start assigning scalers */
+- for (i = 0; i < sizeof(scaler_state->scaler_users) * 8; i++) {
+- int *scaler_id;
+- const char *name;
+- int idx, ret;
+-
+- /* skip if scaler not required */
+- if (!(scaler_state->scaler_users & (1 << i)))
+- continue;
+-
+- if (i == SKL_CRTC_INDEX) {
+- name = "CRTC";
+- idx = intel_crtc->base.base.id;
+-
+- /* panel fitter case: assign as a crtc scaler */
+- scaler_id = &scaler_state->scaler_id;
+- } else {
+- name = "PLANE";
+-
+- /* plane scaler case: assign as a plane scaler */
+- /* find the plane that set the bit as scaler_user */
+- plane = drm_state->planes[i].ptr;
+-
+- /*
+- * to enable/disable hq mode, add planes that are using scaler
+- * into this transaction
+- */
+- if (!plane) {
+- struct drm_plane_state *state;
+-
+- /*
+- * GLK+ scalers don't have a HQ mode so it
+- * isn't necessary to change between HQ and dyn mode
+- * on those platforms.
+- */
+- if (DISPLAY_VER(dev_priv) >= 10)
+- continue;
+-
+- plane = drm_plane_from_index(&dev_priv->drm, i);
+- state = drm_atomic_get_plane_state(drm_state, plane);
+- if (IS_ERR(state)) {
+- drm_dbg_kms(&dev_priv->drm,
+- "Failed to add [PLANE:%d] to drm_state\n",
+- plane->base.id);
+- return PTR_ERR(state);
+- }
+- }
+-
+- intel_plane = to_intel_plane(plane);
+- idx = plane->base.id;
+-
+- /* plane on different crtc cannot be a scaler user of this crtc */
+- if (drm_WARN_ON(&dev_priv->drm,
+- intel_plane->pipe != intel_crtc->pipe))
+- continue;
+-
+- plane_state = intel_atomic_get_new_plane_state(intel_state,
+- intel_plane);
+- scaler_id = &plane_state->scaler_id;
+- }
+-
+- ret = intel_atomic_setup_scaler(scaler_state, num_scalers_need,
+- intel_crtc, name, idx,
+- plane_state, scaler_id);
+- if (ret < 0)
+- return ret;
+- }
+-
+- return 0;
+-}
+-
+ struct drm_atomic_state *
+ intel_atomic_state_alloc(struct drm_device *dev)
+ {
+diff --git a/drivers/gpu/drm/i915/display/intel_atomic.h b/drivers/gpu/drm/i915/display/intel_atomic.h
+index 1dc439983dd94..e506f6a873447 100644
+--- a/drivers/gpu/drm/i915/display/intel_atomic.h
++++ b/drivers/gpu/drm/i915/display/intel_atomic.h
+@@ -52,8 +52,4 @@ struct intel_crtc_state *
+ intel_atomic_get_crtc_state(struct drm_atomic_state *state,
+ struct intel_crtc *crtc);
+
+-int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
+- struct intel_crtc *intel_crtc,
+- struct intel_crtc_state *crtc_state);
+-
+ #endif /* __INTEL_ATOMIC_H__ */
+diff --git a/drivers/gpu/drm/i915/display/skl_scaler.c b/drivers/gpu/drm/i915/display/skl_scaler.c
+index 90f42f63128ec..83a61efa84395 100644
+--- a/drivers/gpu/drm/i915/display/skl_scaler.c
++++ b/drivers/gpu/drm/i915/display/skl_scaler.c
+@@ -337,6 +337,263 @@ int skl_update_scaler_plane(struct intel_crtc_state *crtc_state,
+ return 0;
+ }
+
++static int intel_atomic_setup_scaler(struct intel_crtc_scaler_state *scaler_state,
++ int num_scalers_need, struct intel_crtc *intel_crtc,
++ const char *name, int idx,
++ struct intel_plane_state *plane_state,
++ int *scaler_id)
++{
++ struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
++ int j;
++ u32 mode;
++
++ if (*scaler_id < 0) {
++ /* find a free scaler */
++ for (j = 0; j < intel_crtc->num_scalers; j++) {
++ if (scaler_state->scalers[j].in_use)
++ continue;
++
++ *scaler_id = j;
++ scaler_state->scalers[*scaler_id].in_use = 1;
++ break;
++ }
++ }
++
++ if (drm_WARN(&dev_priv->drm, *scaler_id < 0,
++ "Cannot find scaler for %s:%d\n", name, idx))
++ return -EINVAL;
++
++ /* set scaler mode */
++ if (plane_state && plane_state->hw.fb &&
++ plane_state->hw.fb->format->is_yuv &&
++ plane_state->hw.fb->format->num_planes > 1) {
++ struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
++
++ if (DISPLAY_VER(dev_priv) == 9) {
++ mode = SKL_PS_SCALER_MODE_NV12;
++ } else if (icl_is_hdr_plane(dev_priv, plane->id)) {
++ /*
++ * On gen11+'s HDR planes we only use the scaler for
++ * scaling. They have a dedicated chroma upsampler, so
++ * we don't need the scaler to upsample the UV plane.
++ */
++ mode = PS_SCALER_MODE_NORMAL;
++ } else {
++ struct intel_plane *linked =
++ plane_state->planar_linked_plane;
++
++ mode = PS_SCALER_MODE_PLANAR;
++
++ if (linked)
++ mode |= PS_PLANE_Y_SEL(linked->id);
++ }
++ } else if (DISPLAY_VER(dev_priv) >= 10) {
++ mode = PS_SCALER_MODE_NORMAL;
++ } else if (num_scalers_need == 1 && intel_crtc->num_scalers > 1) {
++ /*
++ * when only 1 scaler is in use on a pipe with 2 scalers
++ * scaler 0 operates in high quality (HQ) mode.
++ * In this case use scaler 0 to take advantage of HQ mode
++ */
++ scaler_state->scalers[*scaler_id].in_use = 0;
++ *scaler_id = 0;
++ scaler_state->scalers[0].in_use = 1;
++ mode = SKL_PS_SCALER_MODE_HQ;
++ } else {
++ mode = SKL_PS_SCALER_MODE_DYN;
++ }
++
++ /*
++ * FIXME: we should also check the scaler factors for pfit, so
++ * this shouldn't be tied directly to planes.
++ */
++ if (plane_state && plane_state->hw.fb) {
++ const struct drm_framebuffer *fb = plane_state->hw.fb;
++ const struct drm_rect *src = &plane_state->uapi.src;
++ const struct drm_rect *dst = &plane_state->uapi.dst;
++ int hscale, vscale, max_vscale, max_hscale;
++
++ /*
++ * FIXME: When two scalers are needed, but only one of
++ * them needs to downscale, we should make sure that
++ * the one that needs downscaling support is assigned
++ * as the first scaler, so we don't reject downscaling
++ * unnecessarily.
++ */
++
++ if (DISPLAY_VER(dev_priv) >= 14) {
++ /*
++ * On versions 14 and up, only the first
++ * scaler supports a vertical scaling factor
++ * of more than 1.0, while a horizontal
++ * scaling factor of 3.0 is supported.
++ */
++ max_hscale = 0x30000 - 1;
++ if (*scaler_id == 0)
++ max_vscale = 0x30000 - 1;
++ else
++ max_vscale = 0x10000;
++
++ } else if (DISPLAY_VER(dev_priv) >= 10 ||
++ !intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier)) {
++ max_hscale = 0x30000 - 1;
++ max_vscale = 0x30000 - 1;
++ } else {
++ max_hscale = 0x20000 - 1;
++ max_vscale = 0x20000 - 1;
++ }
++
++ /*
++ * FIXME: We should change the if-else block above to
++ * support HQ vs dynamic scaler properly.
++ */
++
++ /* Check if required scaling is within limits */
++ hscale = drm_rect_calc_hscale(src, dst, 1, max_hscale);
++ vscale = drm_rect_calc_vscale(src, dst, 1, max_vscale);
++
++ if (hscale < 0 || vscale < 0) {
++ drm_dbg_kms(&dev_priv->drm,
++ "Scaler %d doesn't support required plane scaling\n",
++ *scaler_id);
++ drm_rect_debug_print("src: ", src, true);
++ drm_rect_debug_print("dst: ", dst, false);
++
++ return -EINVAL;
++ }
++ }
++
++ drm_dbg_kms(&dev_priv->drm, "Attached scaler id %u.%u to %s:%d\n",
++ intel_crtc->pipe, *scaler_id, name, idx);
++ scaler_state->scalers[*scaler_id].mode = mode;
++
++ return 0;
++}
++
++/**
++ * intel_atomic_setup_scalers() - setup scalers for crtc per staged requests
++ * @dev_priv: i915 device
++ * @intel_crtc: intel crtc
++ * @crtc_state: incoming crtc_state to validate and setup scalers
++ *
++ * This function sets up scalers based on staged scaling requests for
++ * a @crtc and its planes. It is called from crtc level check path. If request
++ * is a supportable request, it attaches scalers to requested planes and crtc.
++ *
++ * This function takes into account the current scaler(s) in use by any planes
++ * not being part of this atomic state
++ *
++ * Returns:
++ * 0 - scalers were setup successfully
++ * error code - otherwise
++ */
++int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
++ struct intel_crtc *intel_crtc,
++ struct intel_crtc_state *crtc_state)
++{
++ struct drm_plane *plane = NULL;
++ struct intel_plane *intel_plane;
++ struct intel_plane_state *plane_state = NULL;
++ struct intel_crtc_scaler_state *scaler_state =
++ &crtc_state->scaler_state;
++ struct drm_atomic_state *drm_state = crtc_state->uapi.state;
++ struct intel_atomic_state *intel_state = to_intel_atomic_state(drm_state);
++ int num_scalers_need;
++ int i;
++
++ num_scalers_need = hweight32(scaler_state->scaler_users);
++
++ /*
++ * High level flow:
++ * - staged scaler requests are already in scaler_state->scaler_users
++ * - check whether staged scaling requests can be supported
++ * - add planes using scalers that aren't in current transaction
++ * - assign scalers to requested users
++ * - as part of plane commit, scalers will be committed
++ * (i.e., either attached or detached) to respective planes in hw
++ * - as part of crtc_commit, scaler will be either attached or detached
++ * to crtc in hw
++ */
++
++ /* fail if required scalers > available scalers */
++ if (num_scalers_need > intel_crtc->num_scalers) {
++ drm_dbg_kms(&dev_priv->drm,
++ "Too many scaling requests %d > %d\n",
++ num_scalers_need, intel_crtc->num_scalers);
++ return -EINVAL;
++ }
++
++ /* walkthrough scaler_users bits and start assigning scalers */
++ for (i = 0; i < sizeof(scaler_state->scaler_users) * 8; i++) {
++ int *scaler_id;
++ const char *name;
++ int idx, ret;
++
++ /* skip if scaler not required */
++ if (!(scaler_state->scaler_users & (1 << i)))
++ continue;
++
++ if (i == SKL_CRTC_INDEX) {
++ name = "CRTC";
++ idx = intel_crtc->base.base.id;
++
++ /* panel fitter case: assign as a crtc scaler */
++ scaler_id = &scaler_state->scaler_id;
++ } else {
++ name = "PLANE";
++
++ /* plane scaler case: assign as a plane scaler */
++ /* find the plane that set the bit as scaler_user */
++ plane = drm_state->planes[i].ptr;
++
++ /*
++ * to enable/disable hq mode, add planes that are using scaler
++ * into this transaction
++ */
++ if (!plane) {
++ struct drm_plane_state *state;
++
++ /*
++ * GLK+ scalers don't have a HQ mode so it
++ * isn't necessary to change between HQ and dyn mode
++ * on those platforms.
++ */
++ if (DISPLAY_VER(dev_priv) >= 10)
++ continue;
++
++ plane = drm_plane_from_index(&dev_priv->drm, i);
++ state = drm_atomic_get_plane_state(drm_state, plane);
++ if (IS_ERR(state)) {
++ drm_dbg_kms(&dev_priv->drm,
++ "Failed to add [PLANE:%d] to drm_state\n",
++ plane->base.id);
++ return PTR_ERR(state);
++ }
++ }
++
++ intel_plane = to_intel_plane(plane);
++ idx = plane->base.id;
++
++ /* plane on different crtc cannot be a scaler user of this crtc */
++ if (drm_WARN_ON(&dev_priv->drm,
++ intel_plane->pipe != intel_crtc->pipe))
++ continue;
++
++ plane_state = intel_atomic_get_new_plane_state(intel_state,
++ intel_plane);
++ scaler_id = &plane_state->scaler_id;
++ }
++
++ ret = intel_atomic_setup_scaler(scaler_state, num_scalers_need,
++ intel_crtc, name, idx,
++ plane_state, scaler_id);
++ if (ret < 0)
++ return ret;
++ }
++
++ return 0;
++}
++
+ static int glk_coef_tap(int i)
+ {
+ return i % 7;
+diff --git a/drivers/gpu/drm/i915/display/skl_scaler.h b/drivers/gpu/drm/i915/display/skl_scaler.h
+index 0097d5d08e102..f040f6ac061f2 100644
+--- a/drivers/gpu/drm/i915/display/skl_scaler.h
++++ b/drivers/gpu/drm/i915/display/skl_scaler.h
+@@ -8,17 +8,22 @@
+ #include <linux/types.h>
+
+ enum drm_scaling_filter;
++enum pipe;
+ struct drm_i915_private;
++struct intel_crtc;
+ struct intel_crtc_state;
+-struct intel_plane_state;
+ struct intel_plane;
+-enum pipe;
++struct intel_plane_state;
+
+ int skl_update_scaler_crtc(struct intel_crtc_state *crtc_state);
+
+ int skl_update_scaler_plane(struct intel_crtc_state *crtc_state,
+ struct intel_plane_state *plane_state);
+
++int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
++ struct intel_crtc *intel_crtc,
++ struct intel_crtc_state *crtc_state);
++
+ void skl_pfit_enable(const struct intel_crtc_state *crtc_state);
+
+ void skl_program_plane_scaler(struct intel_plane *plane,
+@@ -26,4 +31,5 @@ void skl_program_plane_scaler(struct intel_plane *plane,
+ const struct intel_plane_state *plane_state);
+ void skl_detach_scalers(const struct intel_crtc_state *crtc_state);
+ void skl_scaler_disable(const struct intel_crtc_state *old_crtc_state);
++
+ #endif
+--
+2.43.0
+