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