From: Jani Nikula <jani.nikula@intel.com>
To: intel-gfx@lists.freedesktop.org, Paulo Zanoni <przanoni@gmail.com>
Cc: jani.nikula@intel.com
Subject: [PATCH v2] drm/i915: use lower aux clock divider on non-ULT HSW
Date: Tue, 9 Apr 2013 08:11:00 +0300 [thread overview]
Message-ID: <1365484260-3868-1-git-send-email-jani.nikula@intel.com> (raw)
In-Reply-To: <CA+gsUGQWmSFV_t6WbdATn_4DjH+Ttg9ji4LhyWRymzqonmPRdw@mail.gmail.com>
Workaround to avoid intermittent aux channel failures, per spec change.
v2: Don't mess with cpu dp aux divider (Paulo Zanoni)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
Untested.
---
drivers/gpu/drm/i915/intel_dp.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 482b5e5..f8474d1 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -353,10 +353,14 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
aux_clock_divider = 200; /* SNB & IVB eDP input clock at 400Mhz */
else
aux_clock_divider = 225; /* eDP input clock at 450Mhz */
- } else if (HAS_PCH_SPLIT(dev))
+ } else if (dev_priv->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE) {
+ /* Workaround for non-ULT HSW */
+ aux_clock_divider = 74;
+ } else if (HAS_PCH_SPLIT(dev)) {
aux_clock_divider = DIV_ROUND_UP(intel_pch_rawclk(dev), 2);
- else
+ } else {
aux_clock_divider = intel_hrawclk(dev) / 2;
+ }
if (IS_GEN6(dev))
precharge = 3;
--
1.7.10.4
next prev parent reply other threads:[~2013-04-09 5:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-08 20:00 [PATCH] drm/i915: use lower aux clock divider on non-ULT HSW Jani Nikula
2013-04-08 21:03 ` Paulo Zanoni
2013-04-09 5:11 ` Jani Nikula [this message]
2013-04-09 14:49 ` [PATCH v2] " Paulo Zanoni
2013-04-09 14:59 ` Daniel Vetter
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