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Commit 46649d8b authored by Ander Conselvan de Oliveira's avatar Ander Conselvan de Oliveira
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drm/i915/glk: Don't allow 12 bpc when htotal is too big 

Display workaround #1139 for Geminilake instructs us to restrict HDMI
to 8 bpc when htotal is greater than 5460. Otherwise, the pipe is unable
to generate a proper signal and is left in a state where corruption is
seen with other modes.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100440


Cc: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: default avatarAnder Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: default avatarShashank Sharma <shashank.sharma@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170424104718.26448-1-ander.conselvan.de.oliveira@intel.com
parent f7b02a52

drivers/gpu/drm/i915/intel_hdmi.c

+5 −0
Original line number Diff line number Diff line
@@ -1327,6 +1327,11 @@ static bool hdmi_12bpc_possible(struct intel_crtc_state *crtc_state) 
			return false;

	}



	/* Display Wa #1139 */

	if (IS_GLK_REVID(dev_priv, 0, GLK_REVID_A1) &&

	    crtc_state->base.adjusted_mode.htotal > 5460)

		return false;



	return true;

}