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drm/amd/display: Disconnect phantom pipe OPP from OPTC being disabled 

[ Upstream commit 7bdbfb4e36e34eb788e44f27666bf0a2b3b90803 ]

[Why]
If an OPP is used for a different OPTC without first being disconnected
from the previous OPTC, unexpected behaviour can occur. This also
applies to phantom pipes, which is what the current logic missed.

[How]
Disconnect OPPs from OPTC for phantom pipes before disabling OTG master.

Also move the disconnection to before the OTG master disable, since the
register is double buffered.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: George Shen <george.shen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: b4e05bb1dec5 ("drm/amd/display: Clear OPTC mem select on disable")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
George Shen 2023-12-17 17:17:57 -05:00 committed by Greg Kroah-Hartman
parent ae62f1dde6
commit 6a1cb68b98
1 changed files with 13 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/gpu/drm/amd/display/dc/dcn32/dcn32_optc.c
View File

@ -142,12 +142,6 @@ static bool optc32_disable_crtc(struct timing_generator *optc)
{
struct optc *optc1 = DCN10TG_FROM_TG(optc);
/* disable otg request until end of the first line
* in the vertical blank region
*/
REG_UPDATE(OTG_CONTROL,
OTG_MASTER_EN, 0);
REG_UPDATE_5(OPTC_DATA_SOURCE_SELECT,
OPTC_SEG0_SRC_SEL, 0xf,
OPTC_SEG1_SRC_SEL, 0xf,
@ -155,6 +149,12 @@ static bool optc32_disable_crtc(struct timing_generator *optc)
OPTC_SEG3_SRC_SEL, 0xf,
OPTC_NUM_OF_INPUT_SEGMENT, 0);
/* disable otg request until end of the first line
* in the vertical blank region
*/
REG_UPDATE(OTG_CONTROL,
OTG_MASTER_EN, 0);
REG_UPDATE(CONTROL,
VTG0_ENABLE, 0);
@ -181,6 +181,13 @@ static void optc32_disable_phantom_otg(struct timing_generator *optc)
{
struct optc *optc1 = DCN10TG_FROM_TG(optc);
REG_UPDATE_5(OPTC_DATA_SOURCE_SELECT,
OPTC_SEG0_SRC_SEL, 0xf,
OPTC_SEG1_SRC_SEL, 0xf,
OPTC_SEG2_SRC_SEL, 0xf,
OPTC_SEG3_SRC_SEL, 0xf,
OPTC_NUM_OF_INPUT_SEGMENT, 0);
REG_UPDATE(OTG_CONTROL, OTG_MASTER_EN, 0);
}