github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-04 12:35:52 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

drm/panfrost: Set clocks on/off during system sleep on MediaTek SoCs

Browse Source 
All of the MediaTek SoCs supported by Panfrost can switch the clocks
off and on during system sleep to save some power without any user
experience penalty.

Measurements taken on multiple MediaTek SoCs (MT8183/8186/8192/8195)
show that adding this will not prolong the time that is required to
resume the system in any meaningful way.

As an example, for MT8195 - a "before" with only runtime PM operations
(so, without turning on/off GPU clocks), and an "after" executing both
the system sleep .resume() handler and .runtime_resume() (so the time
refers to T_Resume + T_Runtime_Resume):

Average Panfrost-only system sleep resume time, before: ~28000ns
Average Panfrost-only system sleep resume time, after:  ~33500ns

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231109102543.42971-5-angelogioacchino.delregno@collabora.com
This commit is contained in:
AngeloGioacchino Del Regno 2023-11-09 11:25:41 +01:00 committed by Steven Price
parent 56e76c0179
commit 32f175d426
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/panfrost/panfrost_drv.c
View File

@ -730,6 +730,7 @@ static const struct panfrost_compatible mediatek_mt8183_b_data = {
.supply_names = mediatek_mt8183_b_supplies,
.num_pm_domains = ARRAY_SIZE(mediatek_mt8183_pm_domains),
.pm_domain_names = mediatek_mt8183_pm_domains,
.pm_features = BIT(GPU_PM_CLK_DIS),
};
static const char * const mediatek_mt8186_pm_domains[] = { "core0", "core1" };
@ -738,6 +739,7 @@ static const struct panfrost_compatible mediatek_mt8186_data = {
.supply_names = mediatek_mt8183_b_supplies,
.num_pm_domains = ARRAY_SIZE(mediatek_mt8186_pm_domains),
.pm_domain_names = mediatek_mt8186_pm_domains,
.pm_features = BIT(GPU_PM_CLK_DIS),
};
static const char * const mediatek_mt8192_supplies[] = { "mali", NULL };
@ -748,6 +750,7 @@ static const struct panfrost_compatible mediatek_mt8192_data = {
.supply_names = mediatek_mt8192_supplies,
.num_pm_domains = ARRAY_SIZE(mediatek_mt8192_pm_domains),
.pm_domain_names = mediatek_mt8192_pm_domains,
.pm_features = BIT(GPU_PM_CLK_DIS),
};
static const struct of_device_id dt_match[] = {