Commit 6608804b authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Dave Airlie

drm/dp: Add drm_dp_psr_setup_time()

Add a small helper to parse the PSR setup time from the DPCD PSR
capabilities and return the value in microseconds.

v2: Don't waste so many bytes on the psr_setup_time_us[] table

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 44cee85a
...@@ -860,3 +860,35 @@ void drm_dp_aux_unregister(struct drm_dp_aux *aux) ...@@ -860,3 +860,35 @@ void drm_dp_aux_unregister(struct drm_dp_aux *aux)
i2c_del_adapter(&aux->ddc); i2c_del_adapter(&aux->ddc);
} }
EXPORT_SYMBOL(drm_dp_aux_unregister); EXPORT_SYMBOL(drm_dp_aux_unregister);
#define PSR_SETUP_TIME(x) [DP_PSR_SETUP_TIME_ ## x >> DP_PSR_SETUP_TIME_SHIFT] = (x)
/**
* drm_dp_psr_setup_time() - PSR setup in time usec
* @psr_cap: PSR capabilities from DPCD
*
* Returns:
* PSR setup time for the panel in microseconds, negative
* error code on failure.
*/
int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE])
{
static const u16 psr_setup_time_us[] = {
PSR_SETUP_TIME(330),
PSR_SETUP_TIME(275),
PSR_SETUP_TIME(165),
PSR_SETUP_TIME(110),
PSR_SETUP_TIME(55),
PSR_SETUP_TIME(0),
};
int i;
i = (psr_cap[1] & DP_PSR_SETUP_TIME_MASK) >> DP_PSR_SETUP_TIME_SHIFT;
if (i >= ARRAY_SIZE(psr_setup_time_us))
return -EINVAL;
return psr_setup_time_us[i];
}
EXPORT_SYMBOL(drm_dp_psr_setup_time);
#undef PSR_SETUP_TIME
...@@ -657,6 +657,8 @@ struct edp_vsc_psr { ...@@ -657,6 +657,8 @@ struct edp_vsc_psr {
#define EDP_VSC_PSR_UPDATE_RFB (1<<1) #define EDP_VSC_PSR_UPDATE_RFB (1<<1)
#define EDP_VSC_PSR_CRC_VALUES_VALID (1<<2) #define EDP_VSC_PSR_CRC_VALUES_VALID (1<<2)
int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE]);
static inline int static inline int
drm_dp_max_link_rate(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) drm_dp_max_link_rate(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{ {
......
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