[PATCH] drm/panfrost: reset the Amlogic GXM GPU on runtime resume

[PATCH] drm/panfrost: reset the Amlogic GXM GPU on runtime resume

[Christian Hewitt]

After its first runtime suspend, every power-off of the Mali-T820 in
Amlogic GXM SoCs times out and floods the log with shader, tiler and L2
power transition timeouts. Following a soft reset the cores report not
ready but PWRTRANS never clears, however long the driver waits.

The transitions complete normally when the GPU comes out of a hardware
reset, as it does at probe. Use runtime PM with reset and clock control
for GXM so the GPU is reset on every resume.

Fixes: 22aa1a209018 ("drm/panfrost: Really power off GPU cores in panfrost_gpu_power_off()")
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
---
 drivers/gpu/drm/panfrost/panfrost_drv.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 36cc2e67a308..df8a41a9a70f 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -1092,6 +1092,13 @@ static const struct panfrost_compatible amlogic_data = {
 	.vendor_quirk = panfrost_gpu_amlogic_quirk,
 };
 
+static const struct panfrost_compatible amlogic_gxm_data = {
+	.num_supplies = ARRAY_SIZE(default_supplies) - 1,
+	.supply_names = default_supplies,
+	.vendor_quirk = panfrost_gpu_amlogic_quirk,
+	.pm_features = BIT(GPU_PM_RT),
+};
+
 static const char * const mediatek_pm_domains[] = { "core0", "core1", "core2",
 						    "core3", "core4" };
 /*
@@ -1156,7 +1163,7 @@ static const struct panfrost_compatible mediatek_mt8370_data = {
 static const struct of_device_id dt_match[] = {
 	/* Set first to probe before the generic compatibles */
 	{ .compatible = "amlogic,meson-gxm-mali",
-	  .data = &amlogic_data, },
+	  .data = &amlogic_gxm_data, },
 	{ .compatible = "amlogic,meson-g12a-mali",
 	  .data = &amlogic_data, },
 	{ .compatible = "renesas,r9a08g046-mali", .data = &default_pm_rt_data },
-- 
2.43.0