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drm/amd/display: On clock init, maintain DISPCLK freq

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[Why]
On init if a display is connected, we need to maintain the DISPCLK
frequency Even though DPG_EN=1, the display still requires the correct
timing or it could cause audio corruption (if DISPCLK freq is reduced).

[How]
Read the current DISPCLK freq and request the same value to ensure the
timing is valid and unchanged.

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Chris Park <chris.park@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Chris Park 2024-06-04 14:25:14 -04:00 committed by Alex Deucher
parent 3a69c1702f
commit 3838c67365
2 changed files with 27 additions and 1 deletions
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17
drivers/gpu/drm/amd/display/dc/clk_mgr/dcn401/dcn401_clk_mgr.c
View File

@ -1459,6 +1459,22 @@ static int dcn401_get_dtb_ref_freq_khz(struct clk_mgr *clk_mgr_base)
return dtb_ref_clk_khz;
}
static int dcn401_get_dispclk_from_dentist(struct clk_mgr *clk_mgr_base)
{
struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base);
uint32_t dispclk_wdivider;
int disp_divider;
REG_GET(DENTIST_DISPCLK_CNTL, DENTIST_DISPCLK_WDIVIDER, &dispclk_wdivider);
disp_divider = dentist_get_divider_from_did(dispclk_wdivider);
/* Return DISPCLK freq in Khz */
if (disp_divider)
return (DENTIST_DIVIDER_RANGE_SCALE_FACTOR * clk_mgr->base.dentist_vco_freq_khz) / disp_divider;
return 0;
}
static struct clk_mgr_funcs dcn401_funcs = {
.get_dp_ref_clk_frequency = dce12_get_dp_ref_freq_khz,
.get_dtb_ref_clk_frequency = dcn401_get_dtb_ref_freq_khz,
@ -1472,6 +1488,7 @@ static struct clk_mgr_funcs dcn401_funcs = {
.are_clock_states_equal = dcn401_are_clock_states_equal,
.enable_pme_wa = dcn401_enable_pme_wa,
.is_smu_present = dcn401_is_smu_present,
.get_dispclk_from_dentist = dcn401_get_dispclk_from_dentist,
};
struct clk_mgr_internal *dcn401_clk_mgr_construct(

11
drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
View File

@ -57,7 +57,16 @@ static void dcn401_initialize_min_clocks(struct dc *dc)
clocks->socclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].socclk_mhz * 1000;
clocks->dramclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].memclk_mhz * 1000;
clocks->dppclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].dppclk_mhz * 1000;
clocks->dispclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].dispclk_mhz * 1000;
if (dc->debug.disable_boot_optimizations) {
clocks->dispclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].dispclk_mhz * 1000;
} else {
/* Even though DPG_EN = 1 for the connected display, it still requires the
* correct timing so we cannot set DISPCLK to min freq or it could cause
* audio corruption. Read current DISPCLK from DENTIST and request the same
* freq to ensure that the timing is valid and unchanged.
*/
clocks->dispclk_khz = dc->clk_mgr->funcs->get_dispclk_from_dentist(dc->clk_mgr);
}
clocks->ref_dtbclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].dtbclk_mhz * 1000;
clocks->fclk_p_state_change_support = true;
clocks->p_state_change_support = true;