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| author | Jani Nikula <jani.nikula@intel.com> | 2016-06-03 14:57:05 (GMT) |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2016-06-06 06:44:40 (GMT) |
| commit | f90e8c36c8864472e4f8524de78633272de33b88 (patch) | |
| tree | 98e368af4aac4c08e84f1e906a5fa22aebb48d99 /drivers/gpu/drm/i915/i915_reg.h | |
| parent | 1750d59dfa3caf1fc5354a2217f0e83d717c9b22 (diff) | |
| download | linux-f90e8c36c8864472e4f8524de78633272de33b88.tar.xz | |
drm/i915/dsi: fix bxt split screen and color issue
Fix the failure mode where the display appears split, or shifted about
2/3 of the screen, and the color components are cycled. Turns out we
were missing the crucial BXT_DEFEATURE_DPI_FIFO_CTR bit in the
EOT_DISABLE register.
Per bspec, with the bit set, the "mipi_dpf_vblank_start" signal is
asserted only when the complete frame is transferred in the DPHY line
and also the DPI FIFO is flushed out at the end of each frame.
The problem was mitigated by keeping the panel fitter enabled, but that
only limited the issue to a shift of about 0..10 pixels. With the fix
here, the panel fitter workaround does not seem to be needed at all.
While at it, set BXT_DPHY_DEFEATURE_EN in EOT_DISABLE register which is
also needed per the BXT DSI mode set sequence.
Issue: VIZ-7610
Cc: Mika Kahola <mika.kahola@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Ramalingam C <ramalingam.c@intel.com>
Cc: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1464965825-31035-1-git-send-email-jani.nikula@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/i915_reg.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_reg.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 0845059..f7b822a 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -8151,6 +8151,8 @@ enum skl_disp_power_wells { #define _MIPIA_EOT_DISABLE (dev_priv->mipi_mmio_base + 0xb05c) #define _MIPIC_EOT_DISABLE (dev_priv->mipi_mmio_base + 0xb85c) #define MIPI_EOT_DISABLE(port) _MMIO_MIPI(port, _MIPIA_EOT_DISABLE, _MIPIC_EOT_DISABLE) +#define BXT_DEFEATURE_DPI_FIFO_CTR (1 << 9) +#define BXT_DPHY_DEFEATURE_EN (1 << 8) #define LP_RX_TIMEOUT_ERROR_RECOVERY_DISABLE (1 << 7) #define HS_RX_TIMEOUT_ERROR_RECOVERY_DISABLE (1 << 6) #define LOW_CONTENTION_RECOVERY_DISABLE (1 << 5) |