From: Paulo Zanoni <paulo.r.zanoni at intel.com> Check the VBT to see if the machine has inverted FDI RX polarity on CPT. Based on this bit, set the appropriate bit on the TRANS_CHICKEN2 registers. This should fix some machines that were showing black screens on all outputs. Cc: stable at vger.kernel.org Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=60029 Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com> --- drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/i915_reg.h | 2 +- drivers/gpu/drm/i915/intel_bios.c | 6 ++++-- drivers/gpu/drm/i915/intel_bios.h | 4 +++- drivers/gpu/drm/i915/intel_pm.c | 9 +++++++-- 5 files changed, 16 insertions(+), 6 deletions(-) This is *not* the patch tested by the bug reporters, but I believe this is equivalent. I'm also posting this patch on bugzilla right now, so we'll get test reports for this one too. diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 69ddfd1..98c095c 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -964,6 +964,7 @@ typedef struct drm_i915_private { unsigned int int_crt_support:1; unsigned int lvds_use_ssc:1; unsigned int display_clock_mode:1; + unsigned int fdi_rx_polarity_inverted:1; int lvds_ssc_freq; unsigned int bios_lvds_val; /* initial [PCH_]LVDS reg val in VBIOS */ struct { diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 0e4b7fb..759b1b8 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -3950,7 +3950,7 @@ #define _TRANSB_CHICKEN2 0xf1064 #define TRANS_CHICKEN2(pipe) _PIPE(pipe, _TRANSA_CHICKEN2, _TRANSB_CHICKEN2) #define TRANS_CHICKEN2_TIMING_OVERRIDE (1<<31) - +#define TRANS_CHICKEN2_FDI_POLARITY_REVERSED (1<<29) #define SOUTH_CHICKEN1 0xc2000 #define FDIA_PHASE_SYNC_SHIFT_OVR 19 diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index 194df27..95070b2 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -351,12 +351,14 @@ parse_general_features(struct drm_i915_private *dev_priv, dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, general->ssc_freq); dev_priv->display_clock_mode = general->display_clock_mode; - DRM_DEBUG_KMS("BDB_GENERAL_FEATURES int_tv_support %d int_crt_support %d lvds_use_ssc %d lvds_ssc_freq %d display_clock_mode %d\n", + dev_priv->fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted; + DRM_DEBUG_KMS("BDB_GENERAL_FEATURES int_tv_support %d int_crt_support %d lvds_use_ssc %d lvds_ssc_freq %d display_clock_mode %d fdi_rx_polarity_inverted %d\n", dev_priv->int_tv_support, dev_priv->int_crt_support, dev_priv->lvds_use_ssc, dev_priv->lvds_ssc_freq, - dev_priv->display_clock_mode); + dev_priv->display_clock_mode, + dev_priv->fdi_rx_polarity_inverted); } } diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h index 36e57f9..e088d6f 100644 --- a/drivers/gpu/drm/i915/intel_bios.h +++ b/drivers/gpu/drm/i915/intel_bios.h @@ -127,7 +127,9 @@ struct bdb_general_features { /* bits 3 */ u8 disable_smooth_vision:1; u8 single_dvi:1; - u8 rsvd9:6; /* finish byte */ + u8 rsvd9:1; + u8 fdi_rx_polarity_inverted:1; + u8 rsvd10:4; /* finish byte */ /* bits 4 */ u8 legacy_monitor_detect; diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 17f157a..ce3d892 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3575,6 +3575,7 @@ static void cpt_init_clock_gating(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; int pipe; + uint32_t val; /* * On Ibex Peak and Cougar Point, we need to disable clock @@ -3587,8 +3588,12 @@ static void cpt_init_clock_gating(struct drm_device *dev) /* The below fixes the weird display corruption, a few pixels shifted * downward, on (only) LVDS of some HP laptops with IVY. */ - for_each_pipe(pipe) - I915_WRITE(TRANS_CHICKEN2(pipe), TRANS_CHICKEN2_TIMING_OVERRIDE); + for_each_pipe(pipe) { + val = TRANS_CHICKEN2_TIMING_OVERRIDE; + if (dev_priv->fdi_rx_polarity_inverted) + val |= TRANS_CHICKEN2_FDI_POLARITY_REVERSED; + I915_WRITE(TRANS_CHICKEN2(pipe), val); + } /* WADP0ClockGatingDisable */ for_each_pipe(pipe) { I915_WRITE(TRANS_CHICKEN1(pipe), -- 1.7.10.4
