From: Maxime Ripard maxime@cerno.tech
commit 258e483a4d5e97a6a8caa74381ddc1f395ac1c71 upstream.
The current code tries to handle the case where CONFIG_PM isn't selected by first calling our runtime_resume implementation and then properly report the power state to the runtime_pm core.
This allows to have a functionning device even if pm_runtime_get_* functions are nops.
However, the device power state if CONFIG_PM is enabled is RPM_SUSPENDED, and thus our vc4_hdmi_write() and vc4_hdmi_read() calls in the runtime_pm hooks will now report a warning since the device might not be properly powered.
Even more so, we need CONFIG_PM enabled since the previous RaspberryPi have a power domain that needs to be powered up for the HDMI controller to be usable.
The previous patch has created a dependency on CONFIG_PM, now we can just assume it's there and only call pm_runtime_resume_and_get() to make sure our device is powered in bind.
Link: https://lore.kernel.org/r/20220629123510.1915022-39-maxime@cerno.tech Acked-by: Thomas Zimmermann tzimmermann@suse.de Tested-by: Stefan Wahren stefan.wahren@i2se.com Signed-off-by: Maxime Ripard maxime@cerno.tech (cherry picked from commit 53565c28e6af2cef6bbf438c34250135e3564459) Signed-off-by: Maxime Ripard maxime@cerno.tech Cc: "Sudip Mukherjee (Codethink)" sudipm.mukherjee@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/vc4/vc4_hdmi.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -2219,17 +2219,15 @@ static int vc4_hdmi_bind(struct device * if (ret) goto err_put_ddc;
+ pm_runtime_enable(dev); + /* - * We need to have the device powered up at this point to call - * our reset hook and for the CEC init. + * We need to have the device powered up at this point to call + * our reset hook and for the CEC init. */ - ret = vc4_hdmi_runtime_resume(dev); + ret = pm_runtime_resume_and_get(dev); if (ret) - goto err_put_ddc; - - pm_runtime_get_noresume(dev); - pm_runtime_set_active(dev); - pm_runtime_enable(dev); + goto err_disable_runtime_pm;
if (vc4_hdmi->variant->reset) vc4_hdmi->variant->reset(vc4_hdmi); @@ -2278,6 +2276,7 @@ err_destroy_conn: err_destroy_encoder: drm_encoder_cleanup(encoder); pm_runtime_put_sync(dev); +err_disable_runtime_pm: pm_runtime_disable(dev); err_put_ddc: put_device(&vc4_hdmi->ddc->dev);