drm/v3d: Clean caches before runtime suspend

On runtime suspend, clean the V3D caches before suspending so all dirty
lines are written back to memory before the power domain is shut down.

Fixes several system hangs reported in [1][2][3].

Closes: https://github.com/raspberrypi/linux/issues/7381 [1]
Closes: https://github.com/raspberrypi/linux/issues/7396 [2]
Closes: https://github.com/raspberrypi/linux/issues/7397 [3]
Fixes: 458f2a712ab4 ("drm/v3d: Introduce Runtime Power Management")
Link: https://patch.msgid.link/20260530-v3d-fix-rpi4-freezes-v1-3-c2c8307da6ce@igalia.com
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>

diff --git a/drivers/gpu/drm/v3d/v3d_power.c b/drivers/gpu/drm/v3d/v3d_power.c
index 769e90032b042ab3471259d3f0ddd7c8a3f3f7b2..f7df6393d38fe3a83a4aa3e517c6b7a6add3c481 100644 (file)
--- a/drivers/gpu/drm/v3d/v3d_power.c
+++ b/drivers/gpu/drm/v3d/v3d_power.c
@@ -52,6 +52,8 @@ int v3d_power_suspend(struct device *dev)
 
        v3d_irq_disable(v3d);
 
+       v3d_clean_caches(v3d);
+
        ret = v3d_suspend_sms(v3d);
        if (ret) {
                v3d_irq_enable(v3d);