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| author | Jesse Barnes <jbarnes@virtuousgeek.org> | 2011-07-27 11:51:40 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2011-07-28 16:28:21 -0700 |
| commit | 3bcf603f6d5d18bd9d076dc280de71f48add4101 (patch) | |
| tree | 6d1ed198fd759d3e7aeccd32bc8b5059785da26a /drivers/gpu/drm/i915/intel_display.c | |
| parent | 120eced9efe7fdb5123db4ea47e9adee9b66284e (diff) | |
| download | lwn-3bcf603f6d5d18bd9d076dc280de71f48add4101.tar.gz lwn-3bcf603f6d5d18bd9d076dc280de71f48add4101.zip | |
drm/i915: apply timing generator bug workaround on CPT and PPT
On CougarPoint and PantherPoint PCH chips, the timing generator may fail
to start after DP training completes. This is due to a bug in the
FDI autotraining detect logic (which will stall the timing generator and
re-enable it once training completes), so disable it to avoid silent DP
mode setting failures.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_display.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index d9b8c15998d9..502efc37b074 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -7524,6 +7524,7 @@ static void ibx_init_clock_gating(struct drm_device *dev) static void cpt_init_clock_gating(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; + int pipe; /* * On Ibex Peak and Cougar Point, we need to disable clock @@ -7533,6 +7534,9 @@ static void cpt_init_clock_gating(struct drm_device *dev) I915_WRITE(SOUTH_DSPCLK_GATE_D, PCH_DPLSUNIT_CLOCK_GATE_DISABLE); I915_WRITE(SOUTH_CHICKEN2, I915_READ(SOUTH_CHICKEN2) | DPLS_EDP_PPS_FIX_DIS); + /* Without this, mode sets may fail silently on FDI */ + for_each_pipe(pipe) + I915_WRITE(TRANS_CHICKEN2(pipe), TRANS_AUTOTRAIN_GEN_STALL_DIS); } static void ironlake_teardown_rc6(struct drm_device *dev) |