drm/i915/display: Increase Fast Wake Sync length as a quirk

In commit "drm/i915/display: Increase number of fast wake precharge pulses"
we were increasing Fast Wake sync pulse length to fix problems observed on
Dell Precision 5490 laptop with AUO panel. Later we have observed this is
causing problems on other panels.

Fix these problems by increasing Fast Wake sync pulse length as a quirk
applied for Dell Precision 5490 with problematic panel.

Fixes: f77772866385 ("drm/i915/display: Increase number of fast wake precharge pulses")
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Closes: http://gitlab.freedesktop.org/drm/i915/kernel/-/issues/9739
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2246
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/11762
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Cc: <stable@vger.kernel.org> # v6.10+
Link: https://patchwork.freedesktop.org/patch/msgid/20240902064241.1020965-3-jouni.hogander@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c b/drivers/gpu/drm/i915/display/intel_alpm.c
index 82ee778b2efe934397615394b975110b017fc964..186cf4833f716bee11b9baeacdbcdc219a78751a 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_alpm.c
+++ b/drivers/gpu/drm/i915/display/intel_alpm.c
@@ -228,7 +228,7 @@ bool intel_alpm_compute_params(struct intel_dp *intel_dp,
        int tfw_exit_latency = 20; /* eDP spec */
        int phy_wake = 4;          /* eDP spec */
        int preamble = 8;          /* eDP spec */
-       int precharge = intel_dp_aux_fw_sync_len() - preamble;
+       int precharge = intel_dp_aux_fw_sync_len(intel_dp) - preamble;
        u8 max_wake_lines;
 
        io_wake_time = max(precharge, io_buffer_wake_time(crtc_state)) +

diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c b/drivers/gpu/drm/i915/display/intel_dp_aux.c
index cbc817bb0cc3ecccaf10a01acada044c8902c022..6420da69f3bbc68d6334a7cc4feb4cd074931a52 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp_aux.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c
@@ -13,6 +13,7 @@
 #include "intel_dp_aux.h"
 #include "intel_dp_aux_regs.h"
 #include "intel_pps.h"
+#include "intel_quirks.h"
 #include "intel_tc.h"
 
 #define AUX_CH_NAME_BUFSIZE    6
@@ -142,16 +143,21 @@ static int intel_dp_aux_sync_len(void)
        return precharge + preamble;
 }
 
-int intel_dp_aux_fw_sync_len(void)
+int intel_dp_aux_fw_sync_len(struct intel_dp *intel_dp)
 {
+       int precharge = 10; /* 10-16 */
+       int preamble = 8;
+
        /*
         * We faced some glitches on Dell Precision 5490 MTL laptop with panel:
         * "Manufacturer: AUO, Model: 63898" when using HW default 18. Using 20
         * is fixing these problems with the panel. It is still within range
-        * mentioned in eDP specification.
+        * mentioned in eDP specification. Increasing Fast Wake sync length is
+        * causing problems with other panels: increase length as a quirk for
+        * this specific laptop.
         */
-       int precharge = 12; /* 10-16 */
-       int preamble = 8;
+       if (intel_has_dpcd_quirk(intel_dp, QUIRK_FW_SYNC_LEN))
+               precharge += 2;
 
        return precharge + preamble;
 }
@@ -211,7 +217,7 @@ static u32 skl_get_aux_send_ctl(struct intel_dp *intel_dp,
                DP_AUX_CH_CTL_TIME_OUT_MAX |
                DP_AUX_CH_CTL_RECEIVE_ERROR |
                DP_AUX_CH_CTL_MESSAGE_SIZE(send_bytes) |
-               DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(intel_dp_aux_fw_sync_len()) |
+               DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(intel_dp_aux_fw_sync_len(intel_dp)) |
                DP_AUX_CH_CTL_SYNC_PULSE_SKL(intel_dp_aux_sync_len());
 
        if (intel_tc_port_in_tbt_alt_mode(dig_port))

diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.h b/drivers/gpu/drm/i915/display/intel_dp_aux.h
index 76d1f2ed7c2f49e21bab5acc3ce00e2743db1cb0..593f58fafab716e4b0a4802d159fb575b8eb15b2 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp_aux.h
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux.h
@@ -20,6 +20,6 @@ enum aux_ch intel_dp_aux_ch(struct intel_encoder *encoder);
 
 void intel_dp_aux_irq_handler(struct drm_i915_private *i915);
 u32 intel_dp_aux_pack(const u8 *src, int src_bytes);
-int intel_dp_aux_fw_sync_len(void);
+int intel_dp_aux_fw_sync_len(struct intel_dp *intel_dp);
 
 #endif /* __INTEL_DP_AUX_H__ */

diff --git a/drivers/gpu/drm/i915/display/intel_quirks.c b/drivers/gpu/drm/i915/display/intel_quirks.c
index bce1f67c918bb7181047bb4eed43b365cd6cffd7..29b56d53a340a0a18f33781c0a68515c2d903de2 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_quirks.c
+++ b/drivers/gpu/drm/i915/display/intel_quirks.c
@@ -70,6 +70,14 @@ static void quirk_no_pps_backlight_power_hook(struct intel_display *display)
        drm_info(display->drm, "Applying no pps backlight power quirk\n");
 }
 
+static void quirk_fw_sync_len(struct intel_dp *intel_dp)
+{
+       struct intel_display *display = to_intel_display(intel_dp);
+
+       intel_set_dpcd_quirk(intel_dp, QUIRK_FW_SYNC_LEN);
+       drm_info(display->drm, "Applying Fast Wake sync pulse count quirk\n");
+}
+
 struct intel_quirk {
        int device;
        int subsystem_vendor;
@@ -224,6 +232,15 @@ static struct intel_quirk intel_quirks[] = {
 };
 
 static struct intel_dpcd_quirk intel_dpcd_quirks[] = {
+       /* Dell Precision 5490 */
+       {
+               .device = 0x7d55,
+               .subsystem_vendor = 0x1028,
+               .subsystem_device = 0x0cc7,
+               .sink_oui = SINK_OUI(0x38, 0xec, 0x11),
+               .hook = quirk_fw_sync_len,
+       },
+
 };
 
 void intel_init_quirks(struct intel_display *display)

diff --git a/drivers/gpu/drm/i915/display/intel_quirks.h b/drivers/gpu/drm/i915/display/intel_quirks.h
index c8db50b9ab74dae55cb96a73afe3b09bac344112..cafdebda75354f25e37bda687fd0cac2afedbe54 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_quirks.h
+++ b/drivers/gpu/drm/i915/display/intel_quirks.h
@@ -19,6 +19,7 @@ enum intel_quirk_id {
        QUIRK_INVERT_BRIGHTNESS,
        QUIRK_LVDS_SSC_DISABLE,
        QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK,
+       QUIRK_FW_SYNC_LEN,
 };
 
 void intel_init_quirks(struct intel_display *display);