From c99a259b4b5192ba30d37fe25f09632d4c52f5d7 Mon Sep 17 00:00:00 2001 From: Manasi Navare Date: Fri, 30 Jun 2017 09:33:48 -0700 Subject: [PATCH] drm/i915/edp: Add a T12 panel delay quirk to fix DP AUX CH timeouts MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch fixes the DP AUX CH timeouts observed during CI IGT tests thus fixing the CI failures. This is done by adding a quirk for a particular PCI device that requires the panel power cycle delay (T12) to be set to 800ms which is 300msecs more than the minimum value specified in the eDP spec. So a quirk is implemented for that specific PCI device. v4: * Add Bugzilla links for FDO bugs in the commit message (Ville, Jani) v3: * Change some comments, specify the delay as 800 * 10 (Ville) v2: * Change the function and variable names to from PPS_T12_ to _T12 since it is a T12 delay (Clint) Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101144 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101154 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101167 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101515 Cc: Ville Syrjala Cc: Clinton Taylor Signed-off-by: Manasi Navare Reviewed-by: Clinton Taylor Link: http://patchwork.freedesktop.org/patch/msgid/1498840428-23176-1-git-send-email-manasi.d.navare@intel.com Signed-off-by: Ville Syrjälä --- drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/intel_display.c | 14 ++++++++++++++ drivers/gpu/drm/i915/intel_dp.c | 10 ++++++++++ 3 files changed, 25 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 29d162b24d8d..a7db1ab60884 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1166,6 +1166,7 @@ enum intel_sbi_destination { #define QUIRK_INVERT_BRIGHTNESS (1<<2) #define QUIRK_BACKLIGHT_PRESENT (1<<3) #define QUIRK_PIN_SWIZZLED_PAGES (1<<5) +#define QUIRK_INCREASE_T12_DELAY (1<<6) struct intel_fbdev; struct intel_fbc_work; diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 9b6689ef5e30..ede3c6c02ec5 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -14771,6 +14771,17 @@ static void quirk_backlight_present(struct drm_device *dev) DRM_INFO("applying backlight present quirk\n"); } +/* Toshiba Satellite P50-C-18C requires T12 delay to be min 800ms + * which is 300 ms greater than eDP spec T12 min. + */ +static void quirk_increase_t12_delay(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = to_i915(dev); + + dev_priv->quirks |= QUIRK_INCREASE_T12_DELAY; + DRM_INFO("Applying T12 delay quirk\n"); +} + struct intel_quirk { int device; int subsystem_vendor; @@ -14854,6 +14865,9 @@ static struct intel_quirk intel_quirks[] = { /* Dell Chromebook 11 (2015 version) */ { 0x0a16, 0x1028, 0x0a35, quirk_backlight_present }, + + /* Toshiba Satellite P50-C-18C */ + { 0x191B, 0x1179, 0xF840, quirk_increase_t12_delay }, }; static void intel_init_quirks(struct drm_device *dev) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 0445d11224d4..a9022d13e959 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -5255,6 +5255,16 @@ intel_dp_init_panel_power_sequencer(struct drm_device *dev, intel_pps_dump_state("cur", &cur); vbt = dev_priv->vbt.edp.pps; + /* On Toshiba Satellite P50-C-18C system the VBT T12 delay + * of 500ms appears to be too short. Ocassionally the panel + * just fails to power back on. Increasing the delay to 800ms + * seems sufficient to avoid this problem. + */ + if (dev_priv->quirks & QUIRK_INCREASE_T12_DELAY) { + vbt.t11_t12 = max_t(u16, vbt.t11_t12, 800 * 10); + DRM_DEBUG_KMS("Increasing T12 panel delay as per the quirk to %d\n", + vbt.t11_t12); + } /* T11_T12 delay is special and actually in units of 100ms, but zero * based in the hw (so we need to add 100 ms). But the sw vbt * table multiplies it with 1000 to make it in units of 100usec,