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Diffstat (limited to 'drivers/gpu/drm/vc4/vc4_hdmi.h')
| -rw-r--r-- | drivers/gpu/drm/vc4/vc4_hdmi.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h index 006142fe8d4e..cf9bb21a8ef7 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.h +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h @@ -183,6 +183,20 @@ struct vc4_hdmi { * @hw_lock: Spinlock protecting device register access. */ spinlock_t hw_lock; + + /** + * @mutex: Mutex protecting the driver access across multiple + * frameworks (KMS, ALSA). + * + * NOTE: While supported, CEC has been left out since + * cec_s_phys_addr_from_edid() might call .adap_enable and lead to a + * reentrancy issue between .get_modes (or .detect) and .adap_enable. + * Since we don't share any state between the CEC hooks and KMS', it's + * not a big deal. The only trouble might come from updating the CEC + * clock divider which might be affected by a modeset, but CEC should + * be resilient to that. + */ + struct mutex mutex; }; static inline struct vc4_hdmi * |