[Intel-gfx] [PATCH 1/2] drm/i915: set CPT FDI RX polarity bits based on VBT

[Paulo Zanoni]

Hi

2013/4/8 Paulo Zanoni <przanoni at gmail.com>:
> 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.

We already have some reporters saying that the new patch works for them 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
>



--
Paulo Zanoni