redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

drm/i915: avoid premature DP AUX timeouts 

During DP AUX communication we might time out 1 jiffy too early, because
the calculated expiry jiffy value is one less than needed.

This is only one reason for false DP AUX timeouts. For a complete
solution we also need the following fix, which is now queued for
mainline: http://marc.info/?l=linux-kernel&m=136748515710837&w=2

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=64133

Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
hifive-unleashed-5.1
Imre Deak 2013-05-21 20:03:20 +03:00 committed by Daniel Vetter
parent e054cc3937
commit 3598706b52
2 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/i915/intel_dp.c
View File

@ -303,7 +303,7 @@ intel_dp_aux_wait_done(struct intel_dp *intel_dp, bool has_aux_irq)
#define C (((status = I915_READ_NOTRACE(ch_ctl)) & DP_AUX_CH_CTL_SEND_BUSY) == 0)
if (has_aux_irq)
done = wait_event_timeout(dev_priv->gmbus_wait_queue, C,
msecs_to_jiffies(10));
msecs_to_jiffies_timeout(10));
else
done = wait_for_atomic(C, 10) == 0;
if (!done)

3
drivers/gpu/drm/i915/intel_i2c.c
View File

@ -263,7 +263,8 @@ gmbus_wait_idle(struct drm_i915_private *dev_priv)
/* Important: The hw handles only the first bit, so set only one! */
I915_WRITE(GMBUS4 + reg_offset, GMBUS_IDLE_EN);
ret = wait_event_timeout(dev_priv->gmbus_wait_queue, C, 10);
ret = wait_event_timeout(dev_priv->gmbus_wait_queue, C,
msecs_to_jiffies_timeout(10));
I915_WRITE(GMBUS4 + reg_offset, 0);