diff options
| author | Imre Deak <imre.deak@intel.com> | 2017-11-29 19:51:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-16 20:06:59 +0100 |
| commit | a18ff97b8fff2c87c50f567749d9e7bb9349b3fa (patch) | |
| tree | d7047b9b655613cefe616988069a50a2b23d0f35 | |
| parent | 7217671ff5ad0ff2e147ebd890ee5625e0c7ff9d (diff) | |
| download | linux-stable-a18ff97b8fff2c87c50f567749d9e7bb9349b3fa.tar.gz linux-stable-a18ff97b8fff2c87c50f567749d9e7bb9349b3fa.tar.bz2 linux-stable-a18ff97b8fff2c87c50f567749d9e7bb9349b3fa.zip | |
drm/i915: Avoid PPS HW/SW state mismatch due to rounding
commit 5643205c6340b565a3be0fe0e7305dc4aa551c74 upstream.
We store a SW state of the t11_t12 timing in 100usec units but have to
program it in 100msec as required by HW. The rounding used during
programming means there will be a mismatch between the SW and HW states
of this value triggering a "PPS state mismatch" error. Avoid this by
storing the already rounded-up value in the SW state.
Note that we still calculate panel_power_cycle_delay with the finer
100usec granularity to avoid any needless waits using that version of
the delay.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103903
Cc: joks <joks@linux.pl>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171129175137.2889-1-imre.deak@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 158438bb0389..add4b2434aa3 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -5336,6 +5336,12 @@ intel_dp_init_panel_power_sequencer(struct drm_device *dev, */ final->t8 = 1; final->t9 = 1; + + /* + * HW has only a 100msec granularity for t11_t12 so round it up + * accordingly. + */ + final->t11_t12 = roundup(final->t11_t12, 100 * 10); } static void |