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

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

drivers/gpu/drm/drm_dp_helper.c

+32 −0
Original line number Diff line number Diff line
@@ -860,3 +860,35 @@ void drm_dp_aux_unregister(struct drm_dp_aux *aux) 
	i2c_del_adapter(&aux->ddc);

}

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

include/drm/drm_dp_helper.h

+2 −0
Original line number Diff line number Diff line
@@ -657,6 +657,8 @@ struct edp_vsc_psr { 
#define EDP_VSC_PSR_UPDATE_RFB		(1<<1)

#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

drm_dp_max_link_rate(const u8 dpcd[DP_RECEIVER_CAP_SIZE])

{