diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.19.8/0803-drm-amd-display-clear-underflow-on-optc-unblank.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.19.8/0803-drm-amd-display-clear-underflow-on-optc-unblank.patch | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.19.8/0803-drm-amd-display-clear-underflow-on-optc-unblank.patch b/common/recipes-kernel/linux/linux-yocto-4.19.8/0803-drm-amd-display-clear-underflow-on-optc-unblank.patch new file mode 100644 index 00000000..300abf5d --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.19.8/0803-drm-amd-display-clear-underflow-on-optc-unblank.patch @@ -0,0 +1,58 @@ +From a16a4fbbf58769146c0d3da13fa5a1277f629e75 Mon Sep 17 00:00:00 2001 +From: Jun Lei <Jun.Lei@amd.com> +Date: Wed, 24 Oct 2018 11:39:55 -0400 +Subject: [PATCH 0803/2940] drm/amd/display: clear underflow on optc unblank + +[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> +--- + .../gpu/drm/amd/display/dc/dcn10/dcn10_optc.c | 19 +++++++++---------- + 1 file changed, 9 insertions(+), 10 deletions(-) + +diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c +index 7c76f4016ba8..7c138615f17d 100644 +--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c ++++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c +@@ -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); + } + + /** +-- +2.17.1 + |