diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/g4x_dp.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/g4x_dp.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/display/g4x_dp.c b/drivers/gpu/drm/i915/display/g4x_dp.c index 82ad8fe7440c0..5a957acebfd62 100644 --- a/drivers/gpu/drm/i915/display/g4x_dp.c +++ b/drivers/gpu/drm/i915/display/g4x_dp.c @@ -395,8 +395,26 @@ static void intel_dp_get_config(struct intel_encoder *encoder, intel_dotclock_calculate(pipe_config->port_clock, &pipe_config->dp_m_n); - if (intel_dp_is_edp(intel_dp)) - intel_edp_fixup_vbt_bpp(encoder, pipe_config->pipe_bpp); + if (intel_dp_is_edp(intel_dp) && dev_priv->vbt.edp.bpp && + pipe_config->pipe_bpp > dev_priv->vbt.edp.bpp) { + /* + * This is a big fat ugly hack. + * + * Some machines in UEFI boot mode provide us a VBT that has 18 + * bpp and 1.62 GHz link bandwidth for eDP, which for reasons + * unknown we fail to light up. Yet the same BIOS boots up with + * 24 bpp and 2.7 GHz link. Use the same bpp as the BIOS uses as + * max, not what it tells us to use. + * + * Note: This will still be broken if the eDP panel is not lit + * up by the BIOS, and thus we can't get the mode at module + * load. + */ + drm_dbg_kms(&dev_priv->drm, + "pipe has %d bpp for eDP panel, overriding BIOS-provided max %d bpp\n", + pipe_config->pipe_bpp, dev_priv->vbt.edp.bpp); + dev_priv->vbt.edp.bpp = pipe_config->pipe_bpp; + } } static void |