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drm/amd/powerplay/smu7: add vblank check for mclk switching (v2) 

Check to make sure the vblank period is long enough to support
mclk switching.

v2: drop needless initial assignment (Nils)

bug: https://bugs.freedesktop.org/show_bug.cgi?id=96868

Cc: stable@vger.kernel.org
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2017-05-11 13:46:12 -04:00
parent ab03d9fe50
commit 14efcf11e9
1 changed files with 27 additions and 4 deletions
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31
drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
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@ -2655,6 +2655,28 @@ static int smu7_get_power_state_size(struct pp_hwmgr *hwmgr)
return sizeof(struct smu7_power_state);
}
static int smu7_vblank_too_short(struct pp_hwmgr *hwmgr,
uint32_t vblank_time_us)
{
struct smu7_hwmgr *data = (struct smu7_hwmgr *)(hwmgr->backend);
uint32_t switch_limit_us;
switch (hwmgr->chip_id) {
case CHIP_POLARIS10:
case CHIP_POLARIS11:
case CHIP_POLARIS12:
switch_limit_us = data->is_memory_gddr5 ? 190 : 150;
break;
default:
switch_limit_us = data->is_memory_gddr5 ? 450 : 150;
break;
}
if (vblank_time_us < switch_limit_us)
return true;
else
return false;
}
static int smu7_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
struct pp_power_state *request_ps,
@ -2669,6 +2691,7 @@ static int smu7_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
bool disable_mclk_switching;
bool disable_mclk_switching_for_frame_lock;
struct cgs_display_info info = {0};
struct cgs_mode_info mode_info = {0};
const struct phm_clock_and_voltage_limits *max_limits;
uint32_t i;
struct smu7_hwmgr *data = (struct smu7_hwmgr *)(hwmgr->backend);
@ -2677,6 +2700,7 @@ static int smu7_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
int32_t count;
int32_t stable_pstate_sclk = 0, stable_pstate_mclk = 0;
info.mode_info = &mode_info;
data->battery_state = (PP_StateUILabel_Battery ==
request_ps->classification.ui_label);
@ -2703,8 +2727,6 @@ static int smu7_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
cgs_get_active_displays_info(hwmgr->device, &info);
/*TO DO result = PHM_CheckVBlankTime(hwmgr, &vblankTooShort);*/
minimum_clocks.engineClock = hwmgr->display_config.min_core_set_clock;
minimum_clocks.memoryClock = hwmgr->display_config.min_mem_set_clock;
@ -2769,8 +2791,9 @@ static int smu7_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
PHM_PlatformCaps_DisableMclkSwitchingForFrameLock);
disable_mclk_switching = (1 < info.display_count) ||
disable_mclk_switching_for_frame_lock;
disable_mclk_switching = ((1 < info.display_count) ||
disable_mclk_switching_for_frame_lock ||
smu7_vblank_too_short(hwmgr, mode_info.vblank_time_us));
sclk = smu7_ps->performance_levels[0].engine_clock;
mclk = smu7_ps->performance_levels[0].memory_clock;