This is a note to let you know that I've just added the patch titled
drm/amd/display: Skip DPP DTO update if root clock is gated
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-display-skip-dpp-dto-update-if-root-clock-is.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 75c703a42deab228c90780b5a91c999e82e6d3d1
Author: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Date: Fri Apr 28 11:23:50 2023 -0400
drm/amd/display: Skip DPP DTO update if root clock is gated
[ Upstream commit 30f90f3c1c2c63c2fa44f61233737d27b72637c2 ]
[Why]
Hardware implements root clock gating by utilizing the DPP DTO registers
with a special case of DTO enabled, phase = 0, modulo = 1. This
conflicts with our policy to always update the DPPDTO for cases where
it's expected to be disabled.
The pipes unexpectedly enter a higher power state than expected because
of this programming flow.
[How]
Guard the upper layers of HWSS against this hardware quirk with
programming the register with an internal state flag in DCCG.
While technically acting as global state for the DCCG, HWSS shouldn't be
expected to understand the hardware quirk for having DTO disabled
causing more power than DTO enabled with this specific setting.
This also prevents sequencing errors from occuring in the future if
we have to program DPP DTO in multiple locations.
Acked-by: Stylon Wang <stylon.wang@xxxxxxx>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Reviewed-by: Jun Lei <jun.lei@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_dccg.c b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_dccg.c
index 4c2fdfea162f5..65c1d754e2d6b 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_dccg.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_dccg.c
@@ -47,6 +47,14 @@ void dccg31_update_dpp_dto(struct dccg *dccg, int dpp_inst, int req_dppclk)
{
struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg);
+ if (dccg->dpp_clock_gated[dpp_inst]) {
+ /*
+ * Do not update the DPPCLK DTO if the clock is stopped.
+ * It is treated the same as if the pipe itself were in PG.
+ */
+ return;
+ }
+
if (dccg->ref_dppclk && req_dppclk) {
int ref_dppclk = dccg->ref_dppclk;
int modulo, phase;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dccg.c b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dccg.c
index de7bfba2c1798..6ba24d5848b20 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dccg.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dccg.c
@@ -322,6 +322,9 @@ static void dccg314_dpp_root_clock_control(
{
struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg);
+ if (dccg->dpp_clock_gated[dpp_inst] == clock_on)
+ return;
+
if (clock_on) {
/* turn off the DTO and leave phase/modulo at max */
REG_UPDATE(DPPCLK_DTO_CTRL, DPPCLK_DTO_ENABLE[dpp_inst], 0);
@@ -335,6 +338,8 @@ static void dccg314_dpp_root_clock_control(
DPPCLK0_DTO_PHASE, 0,
DPPCLK0_DTO_MODULO, 1);
}
+
+ dccg->dpp_clock_gated[dpp_inst] = !clock_on;
}
static const struct dccg_funcs dccg314_funcs = {
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h b/drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h
index ad6acd1b34e1d..9651cccb084a3 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h
@@ -68,6 +68,7 @@ struct dccg {
const struct dccg_funcs *funcs;
int pipe_dppclk_khz[MAX_PIPES];
int ref_dppclk;
+ bool dpp_clock_gated[MAX_PIPES];
//int dtbclk_khz[MAX_PIPES];/* TODO needs to be removed */
//int audio_dtbclk_khz;/* TODO needs to be removed */
//int ref_dtbclk_khz;/* TODO needs to be removed */
