xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/amd/display: clear underflow on optc unblank

Browse Source 
[why]
Underflow is asserted due to some timing condition which does not
actually result in visible underflow (i.e. it occurs while blanked).

[how]
Force clear underflow occured bit whenver we unblank.

Signed-off-by: Jun Lei <Jun.Lei@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jun Lei
2018-10-24 11:39:55 -04:00
committed by Alex Deucher
parent 6263f0fd06
commit 3ce224421b
1 changed files with 9 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
View File

@@ -359,20 +359,19 @@ void optc1_set_blank_data_double_buffer(struct timing_generator *optc, bool enab
static void optc1_unblank_crtc(struct timing_generator *optc)
{
struct optc *optc1 = DCN10TG_FROM_TG(optc);
uint32_t vertical_interrupt_enable = 0;
REG_GET(OTG_VERTICAL_INTERRUPT2_CONTROL,
OTG_VERTICAL_INTERRUPT2_INT_ENABLE, &vertical_interrupt_enable);
/* temporary work around for vertical interrupt, once vertical interrupt enabled,
* this check will be removed.
*/
if (vertical_interrupt_enable)
optc1_set_blank_data_double_buffer(optc, true);
REG_UPDATE_2(OTG_BLANK_CONTROL,
OTG_BLANK_DATA_EN, 0,
OTG_BLANK_DE_MODE, 0);
/* W/A for automated testing
* Automated testing will fail underflow test as there
* sporadic underflows which occur during the optc blank
* sequence. As a w/a, clear underflow on unblank.
* This prevents the failure, but will not mask actual
* underflow that affect real use cases.
*/
optc1_clear_optc_underflow(optc);
}
/**