[PATCH] drm/panfrost: Gate the RK3399 GPU clock in runtime suspend

[Igor Velkov via B4 Relay]

From: Igor Velkov <iav at iav.lv>

The RK3399 Mali-T860 matches arm,mali-t860 and gets default_data, so
panfrost enables aclk_gpu at probe and keeps it enabled until unbind;
runtime suspend powers the GPU off but leaves the clock on.

On ROCK Pi 4A restore from hibernation hangs in genpd_restore_noirq()
of the GPU while panfrost is bound. With the clock gated in runtime
suspend, as on the Allwinner H616 and the Renesas parts, it restores.

Match rockchip,rk3399-mali to default_pm_rt_data.

Signed-off-by: Igor Velkov <iav at iav.lv>
---
Tested on ROCK Pi 4A, drm-misc-next 33ed26235db9 with the rkvdec fix [1]
applied: hibernation with HDMI active restores 6 of 6 with this patch
(once right after glmark2-es2-drm), and hangs 2 of 2 without it.
[1] fixes the same kind of hang in rkvdec, which otherwise hits first.

[1] https://lore.kernel.org/r/20261030-rkvdec-runtime-pm-clocks-v1-1-fb2c5b629e79@iav.lv
---
 drivers/gpu/drm/panfrost/panfrost_drv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 7c348a0bf1ee..21a9a12abefc 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -983,6 +983,7 @@ static const struct of_device_id dt_match[] = {
 	  .data = &amlogic_data, },
 	{ .compatible = "renesas,r9a08g046-mali", .data = &default_pm_rt_data },
 	{ .compatible = "renesas,r9a09g047-mali", .data = &default_pm_rt_data },
+	{ .compatible = "rockchip,rk3399-mali", .data = &default_pm_rt_data },
 	{ .compatible = "arm,mali-t604", .data = &default_data, },
 	{ .compatible = "arm,mali-t624", .data = &default_data, },
 	{ .compatible = "arm,mali-t628", .data = &default_data, },

---
base-commit: 33ed26235db93162935d1719bc6f538c384a2fd8
change-id: 20261030-panfrost-rk3399-pm-rt-cea3fc1790d9

Best regards,
-- 
Igor Velkov <iav at iav.lv>