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drm/amd/display: Force uclk to max for every state

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Workaround for now to avoid underflow.

The uclk switch time should really be bumped up to 404, but doing so
would expose p-state hang issues for higher bandwidth display
configurations.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2019-07-05 16:54:28 -04:00 committed by Alex Deucher
parent 6a5d487754
commit 02316e963a
2 changed files with 13 additions and 3 deletions
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6
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c
View File

@ -911,11 +911,11 @@ void dm_pp_get_funcs(
/* todo set_pme_wa_enable cause 4k@6ohz display not light up */
funcs->nv_funcs.set_pme_wa_enable = NULL;
/* todo debug waring message */
funcs->nv_funcs.set_hard_min_uclk_by_freq = NULL;
funcs->nv_funcs.set_hard_min_uclk_by_freq = pp_nv_set_hard_min_uclk_by_freq;
/* todo compare data with window driver*/
funcs->nv_funcs.get_maximum_sustainable_clocks = NULL;
funcs->nv_funcs.get_maximum_sustainable_clocks = pp_nv_get_maximum_sustainable_clocks;
/*todo compare data with window driver */
funcs->nv_funcs.get_uclk_dpm_states = NULL;
funcs->nv_funcs.get_uclk_dpm_states = pp_nv_get_uclk_dpm_states;
break;
#endif
default:

10
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
View File

@ -2576,6 +2576,9 @@ static void cap_soc_clocks(
&& max_clocks.uClockInKhz != 0)
bb->clock_limits[i].dram_speed_mts = (max_clocks.uClockInKhz / 1000) * 16;
// HACK: Force every uclk to max for now to "disable" uclk switching.
bb->clock_limits[i].dram_speed_mts = (max_clocks.uClockInKhz / 1000) * 16;
if ((bb->clock_limits[i].fabricclk_mhz > (max_clocks.fabricClockInKhz / 1000))
&& max_clocks.fabricClockInKhz != 0)
bb->clock_limits[i].fabricclk_mhz = (max_clocks.fabricClockInKhz / 1000);
@ -2783,6 +2786,8 @@ static bool init_soc_bounding_box(struct dc *dc,
le32_to_cpu(bb->vmm_page_size_bytes);
dcn2_0_soc.dram_clock_change_latency_us =
fixed16_to_double_to_cpu(bb->dram_clock_change_latency_us);
// HACK!! Lower uclock latency switch time so we don't switch
dcn2_0_soc.dram_clock_change_latency_us = 10;
dcn2_0_soc.writeback_dram_clock_change_latency_us =
fixed16_to_double_to_cpu(bb->writeback_dram_clock_change_latency_us);
dcn2_0_soc.return_bus_width_bytes =
@ -2824,6 +2829,7 @@ static bool init_soc_bounding_box(struct dc *dc,
struct pp_smu_nv_clock_table max_clocks = {0};
unsigned int uclk_states[8] = {0};
unsigned int num_states = 0;
int i;
enum pp_smu_status status;
bool clock_limits_available = false;
bool uclk_states_available = false;
@ -2845,6 +2851,10 @@ static bool init_soc_bounding_box(struct dc *dc,
clock_limits_available = (status == PP_SMU_RESULT_OK);
}
// HACK: Use the max uclk_states value for all elements.
for (i = 0; i < num_states; i++)
uclk_states[i] = uclk_states[num_states - 1];
if (clock_limits_available && uclk_states_available && num_states)
update_bounding_box(dc, &dcn2_0_soc, &max_clocks, uclk_states, num_states);
else if (clock_limits_available)