[ 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@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Jun Lei <jun.lei@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
{
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;
{
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);
DPPCLK0_DTO_PHASE, 0,
DPPCLK0_DTO_MODULO, 1);
}
+
+ dccg->dpp_clock_gated[dpp_inst] = !clock_on;
}
static const struct dccg_funcs dccg314_funcs = {
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 */