Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 10214420 authored by Daniel Vetter's avatar Daniel Vetter
Browse files

drm/i915: Replicate BIOS eDP bpp clamping hack for hsw 

Haswell's DDI encoders have their own ->get_config callback and in

commit c6cd2ee2
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Mon Oct 21 10:52:07 2013 +0300

    drm/i915/dp: workaround BIOS eDP bpp clamping issue

we've forgotten to replicate this hack. So let's do it that.

Note for backporters: The above commit and all it's depencies need to
be backported first.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71049


Cc: stable@vger.kernel.org
Tested-by: default avatarGökçen Eraslan <gokcen.eraslan@gmail.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 7c6c2652

drivers/gpu/drm/i915/intel_ddi.c

+20 −0
Original line number Original line Diff line number Diff line
@@ -1406,6 +1406,26 @@ void intel_ddi_get_config(struct intel_encoder *encoder, 
	default:

	default:

		break;

		break;

	}

	}



	if (encoder->type == INTEL_OUTPUT_EDP && 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_DEBUG_KMS("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 intel_ddi_destroy(struct drm_encoder *encoder)

static void intel_ddi_destroy(struct drm_encoder *encoder)