From 46649d8b6cb876e4f823e741d39959cf6e231e85 Mon Sep 17 00:00:00 2001
From: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Date: Mon, 24 Apr 2017 13:47:18 +0300
Subject: [PATCH] drm/i915/glk: Don't allow 12 bpc when htotal is too big
Git-commit: 46649d8b6cb876e4f823e741d39959cf6e231e85
Patch-mainline: v4.13-rc1
References: FATE#322643 bsc#1055900
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: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170424104718.26448-1-ander.conselvan.de.oliveira@intel.com
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/i915/intel_hdmi.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1327,6 +1327,11 @@ static bool hdmi_12bpc_possible(struct i
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;
}