James Ausmus 23a7068ec5 drm/i915/cnl: Mask previous DDI - PLL mapping
Without masking out the old value, we can end up pointing the DDI to a
disabled PLL, which makes the system fall over. Mask out the previous
value before setting the PLL to DDI mapping.

This can be observed by running igt/testdisplay with both an eDP and
HDMI/DP output active.

v2: Add the Bugzilla link

Fixes: 555e38d273172 ("drm/i915/cnl: DDI - PLL mapping")
Testcase: igt/testdisplay
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103997
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Matt Atwood <matthew.s.atwood@intel.com>
Signed-off-by: James Ausmus <james.ausmus@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Tested-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171201021700.13504-1-james.ausmus@intel.com
2017-12-01 09:44:03 -08:00
..
2017-08-09 22:43:50 -07:00
2017-11-02 12:40:41 +10:00
2017-10-07 13:17:07 +02:00
2017-09-05 11:08:17 -07:00
2017-11-02 12:40:41 +10:00
2017-09-10 20:40:00 -07:00
2017-10-15 07:50:38 -04:00
2017-08-29 13:46:35 +02:00
2017-09-05 11:08:17 -07:00
2017-08-22 11:04:51 -07:00
2017-09-11 13:04:32 -07:00
2017-11-02 12:40:41 +10:00
2017-09-13 10:56:00 -07:00
2017-10-28 10:46:20 -07:00
2017-10-28 10:46:20 -07:00
2017-11-02 12:40:41 +10:00
2017-09-05 12:45:03 -07:00
2017-08-30 14:03:42 -06:00
2017-09-14 13:33:33 -07:00
2017-09-07 21:11:05 -07:00
2017-10-27 20:41:05 -07:00
2017-08-24 09:57:28 +02:00