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| author | Ville Syrjälä | 2014-06-27 18:49:57 +0200 |
|---|---|---|
| committer | Daniel Vetter | 2014-08-08 17:43:56 +0200 |
| commit | 3dd7b97458e8aa2d8985b46622d226fa635071e7 (patch) | |
| tree | efa9cc74dc12fbd04aeafa498f9f9d3ecf9a4b3b /drivers/gpu/drm/i915/intel_pm.c | |
| parent | drm/i915: Add cherryview_update_wm() (diff) | |
| download | kernel-qcow2-linux-3dd7b97458e8aa2d8985b46622d226fa635071e7.tar.gz kernel-qcow2-linux-3dd7b97458e8aa2d8985b46622d226fa635071e7.tar.xz kernel-qcow2-linux-3dd7b97458e8aa2d8985b46622d226fa635071e7.zip | |
drm/i915: Hack to tie both common lanes together on chv
It looks like frobbing the cmnreset line on pne PHY disturbs the other
PHY on chv. The result is a black screen. On HDMI it's just a flash of
black, but DP usually falls over and can't get back up.
As a workaround set up the power domains so that both common lane
wells power up and down together. I also tried leaving the cmnreset
deasserted even the if the power well goes down but that didn't seem
acceptable to the PHY.
Reviewed-by: Rafael Barbalho <rafael.barbalho@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_pm.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_pm.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index da43e30ad60b..aaae22815965 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -6877,13 +6877,23 @@ static struct i915_power_well chv_power_wells[] = { #endif { .name = "dpio-common-bc", - .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS, + /* + * XXX: cmnreset for one PHY seems to disturb the other. + * As a workaround keep both powered on at the same + * time for now. + */ + .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS | CHV_DPIO_CMN_D_POWER_DOMAINS, .data = PUNIT_POWER_WELL_DPIO_CMN_BC, .ops = &chv_dpio_cmn_power_well_ops, }, { .name = "dpio-common-d", - .domains = CHV_DPIO_CMN_D_POWER_DOMAINS, + /* + * XXX: cmnreset for one PHY seems to disturb the other. + * As a workaround keep both powered on at the same + * time for now. + */ + .domains = CHV_DPIO_CMN_BC_POWER_DOMAINS | CHV_DPIO_CMN_D_POWER_DOMAINS, .data = PUNIT_POWER_WELL_DPIO_CMN_D, .ops = &chv_dpio_cmn_power_well_ops, }, |