This seems necessary on Freescale i.MX95 Mali G310 to reliably resume from runtime PM suspend. Without this, if only the L2 is powered down on RPM entry, the GPU gets stuck and does not indicate the firmware is booted after RPM resume.
Signed-off-by: Marek Vasut <[email protected]> --- Cc: Boris Brezillon <[email protected]> Cc: Conor Dooley <[email protected]> Cc: David Airlie <[email protected]> Cc: Fabio Estevam <[email protected]> Cc: Krzysztof Kozlowski <[email protected]> Cc: Liviu Dudau <[email protected]> Cc: Maarten Lankhorst <[email protected]> Cc: Maxime Ripard <[email protected]> Cc: Pengutronix Kernel Team <[email protected]> Cc: Philipp Zabel <[email protected]> Cc: Rob Herring <[email protected]> Cc: Sascha Hauer <[email protected]> Cc: Sebastian Reichel <[email protected]> Cc: Shawn Guo <[email protected]> Cc: Simona Vetter <[email protected]> Cc: Steven Price <[email protected]> Cc: Thomas Zimmermann <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] --- drivers/gpu/drm/panthor/panthor_gpu.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/panthor/panthor_gpu.c b/drivers/gpu/drm/panthor/panthor_gpu.c index 671049020afaa..0f07ef7d9aea7 100644 --- a/drivers/gpu/drm/panthor/panthor_gpu.c +++ b/drivers/gpu/drm/panthor/panthor_gpu.c @@ -470,11 +470,12 @@ int panthor_gpu_soft_reset(struct panthor_device *ptdev) */ void panthor_gpu_suspend(struct panthor_device *ptdev) { - /* On a fast reset, simply power down the L2. */ - if (!ptdev->reset.fast) - panthor_gpu_soft_reset(ptdev); - else - panthor_gpu_power_off(ptdev, L2, 1, 20000); + /* + * Power off the L2 and soft reset the GPU, that makes + * iMX95 Mali G310 resume without firmware boot timeout. + */ + panthor_gpu_power_off(ptdev, L2, 1, 20000); + panthor_gpu_soft_reset(ptdev); panthor_gpu_irq_suspend(&ptdev->gpu->irq); } -- 2.47.2
