diff mbox series

[2/4] drm/panfrost: Set clocks on/off during system sleep on MediaTek SoCs

Message ID 20231030132257.85379-3-angelogioacchino.delregno@collabora.com (mailing list archive)
State New, archived
Headers show
Series drm/panfrost: Turn off clocks and regulators in PM | expand

Commit Message

AngeloGioacchino Del Regno Oct. 30, 2023, 1:22 p.m. UTC
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 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 full
system sleep .resume() handler (.resume() -> .runtime_resume() -> done):

Average Panfrost-only system sleep resume time, before: 110372ns
Average Panfrost-only system sleep resume time, after:  114186ns

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/panfrost/panfrost_drv.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 7cabf4e3d1f2..82f3c5fe9c58 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -734,6 +734,7 @@  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" };
@@ -742,6 +743,7 @@  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 };
@@ -752,6 +754,7 @@  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[] = {