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| author |   Hans de Goede <hdegoede@redhat.com> | 2019-05-24 19:40:27 +0200 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2019-06-05 18:24:00 +0200 |
| commit | 2c1c55252647abd989b94f725b190c700312d053 (patch) | |
| tree | 5bea89f359e9a8b09f1584ed8bf0dd33357d2292 /drivers/gpu/drm/i915/intel_drv.h | |
| parent | drm/i915/bios: add an enum for BDB block IDs (diff) | |
| download | linux-dev-2c1c55252647abd989b94f725b190c700312d053.tar.xz linux-dev-2c1c55252647abd989b94f725b190c700312d053.zip | |
drm/i915/dsi: Use a fuzzy check for burst mode clock check
Prior to this commit we fail to init the DSI panel on the GPD MicroPC:
https://www.indiegogo.com/projects/gpd-micropc-6-inch-handheld-industry-laptop#/
The problem is intel_dsi_vbt_init() failing with the following error:
*ERROR* Burst mode freq is less than computed
The pclk in the VBT panel modeline is 70000, together with 24 bpp and
4 lines this results in a bitrate value of 70000 * 24 / 4 = 420000.
But the target_burst_mode_freq in the VBT is 418000.
This commit works around this problem by adding an intel_fuzzy_clock_check
when target_burst_mode_freq < bitrate and setting target_burst_mode_freq to
bitrate when that checks succeeds, fixing the panel not working.
Cc: stable@vger.kernel.org
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190524174028.21659-2-hdegoede@redhat.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_drv.h')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_drv.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 0dcc03592d6e..d0aeb383024a 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -1557,6 +1557,7 @@ int vlv_force_pll_on(struct drm_i915_private *dev_priv, enum pipe pipe, const struct dpll *dpll); void vlv_force_pll_off(struct drm_i915_private *dev_priv, enum pipe pipe); int lpt_get_iclkip(struct drm_i915_private *dev_priv); +bool intel_fuzzy_clock_check(int clock1, int clock2); /* modesetting asserts */ void assert_panel_unlocked(struct drm_i915_private *dev_priv, |