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drm/tilcdc: Register cpufreq notifier after we have initialized crtc 

Register cpufreq notifier after we have initialized the crtc and
unregister it before we remove the ctrc. Receiving a cpufreq notify
without crtc causes a crash.

Reported-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Jyri Sarha <jsarha@ti.com>
hifive-unleashed-5.1
Jyri Sarha 2018-12-12 19:26:32 +02:00
parent 8fe28cb58b
commit 432973fd3a
1 changed files with 17 additions and 17 deletions
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34
drivers/gpu/drm/tilcdc/tilcdc_drv.c
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@ -184,6 +184,12 @@ static void tilcdc_fini(struct drm_device *dev)
{
struct tilcdc_drm_private *priv = dev->dev_private;
#ifdef CONFIG_CPU_FREQ
if (priv->freq_transition.notifier_call)
cpufreq_unregister_notifier(&priv->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
#endif
if (priv->crtc)
tilcdc_crtc_shutdown(priv->crtc);
@ -198,12 +204,6 @@ static void tilcdc_fini(struct drm_device *dev)
drm_mode_config_cleanup(dev);
tilcdc_remove_external_device(dev);
#ifdef CONFIG_CPU_FREQ
if (priv->freq_transition.notifier_call)
cpufreq_unregister_notifier(&priv->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
#endif
if (priv->clk)
clk_put(priv->clk);
@ -274,17 +274,6 @@ static int tilcdc_init(struct drm_driver *ddrv, struct device *dev)
goto init_failed;
}
#ifdef CONFIG_CPU_FREQ
priv->freq_transition.notifier_call = cpufreq_transition;
ret = cpufreq_register_notifier(&priv->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
if (ret) {
dev_err(dev, "failed to register cpufreq notifier\n");
priv->freq_transition.notifier_call = NULL;
goto init_failed;
}
#endif
if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
@ -361,6 +350,17 @@ static int tilcdc_init(struct drm_driver *ddrv, struct device *dev)
}
modeset_init(ddev);
#ifdef CONFIG_CPU_FREQ
priv->freq_transition.notifier_call = cpufreq_transition;
ret = cpufreq_register_notifier(&priv->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
if (ret) {
dev_err(dev, "failed to register cpufreq notifier\n");
priv->freq_transition.notifier_call = NULL;
goto init_failed;
}
#endif
if (priv->is_componentized) {
ret = component_bind_all(dev, ddev);
if (ret < 0)