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From: Jesse Barnes <jbarnes@virtuousgeek.org>
To: intel-gfx@lists.freedesktop.org
Subject: [PATCH 2/7] drm/i915: use 125MHz reference clock for PCH attached eDP
Date: Wed,  8 Sep 2010 12:42:00 -0700	[thread overview]
Message-ID: <1283974925-2913-3-git-send-email-jbarnes@virtuousgeek.org> (raw)
In-Reply-To: <1283974925-2913-1-git-send-email-jbarnes@virtuousgeek.org>

Fix the test so we don't try to use the 450MHz refclk on PCH attached
eDP.

References:
  https://bugs.freedesktop.org/show_bug.cgi?id=29141

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
 drivers/gpu/drm/i915/intel_dp.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 625b480..47eac03 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -246,8 +246,11 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
 	/* The clock divider is based off the hrawclk,
 	 * and would like to run at 2MHz. So, take the
 	 * hrawclk value and divide by 2 and use that
+	 *
+	 * Note that PCH attached eDP panels should use a 125MHz input
+	 * clock divider.
 	 */
-	if (IS_eDP(intel_dp)) {
+	if (IS_eDP(intel_dp) && !IS_PCH_eDP(intel_dp)) {
 		if (IS_GEN6(dev))
 			aux_clock_divider = 200; /* SNB eDP input clock at 400Mhz */
 		else
-- 
1.6.3.3

  parent reply	other threads:[~2010-09-08 19:42 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-08 19:41 eDP fixes Jesse Barnes
2010-09-08 19:41 ` [PATCH 1/7] drm/i915: fix eDP detection Jesse Barnes
2010-09-08 19:42 ` Jesse Barnes [this message]
2010-09-08 19:42 ` [PATCH 3/7] drm/i915: use VDD AUX for panel power around detection and in prepare Jesse Barnes
2010-09-08 19:42 ` [PATCH 4/7] drm/i915: split DP link training across panel power sequencing Jesse Barnes
2010-09-08 19:42 ` [PATCH 5/7] drm/i915: don't change VDD AUX status in panel power functions Jesse Barnes
2010-09-08 19:42 ` [PATCH 6/7] drm/i915: make sure VDD AUX power has time to settle Jesse Barnes
2010-09-08 19:42 ` [PATCH 7/7] drm/i915: make sure panel is sequenced off when starting a mode set Jesse Barnes
2010-09-08 20:11   ` Chris Wilson

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