Similar to DSC DPCD registers, let us cache
FEC_CAPABLE register to avoid using stale
values. With this we can avoid aux reads
everytime and instead read the cached values.
Suggested-by: Jani Nikula <jani.nik...@linux.intel.com>
Cc: Jani Nikula <jani.nik...@linux.intel.com>
Cc: Ville Syrjala <ville.syrj...@linux.intel.com>
Cc: Manasi Navare <manasi.d.nav...@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.sriva...@intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 8 ++++++++
drivers/gpu/drm/i915/intel_drv.h | 1 +
2 files changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index dcc5a207fcbd..8a0e0a0b26f6 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4163,8 +4163,10 @@ static void intel_dp_get_dsc_sink_cap(struct intel_dp
*intel_dp)
/*
*Clear the cached register set to avoid using stale values
* for the sinks that do not support DSC.
+ * Similarly, clear the cached FEC register.
*/
memset(intel_dp->dsc_dpcd, 0, sizeof(intel_dp->dsc_dpcd));
+ memset(intel_dp->fec_dpcd, 0, sizeof(intel_dp->fec_dpcd));
/* Cache the DSC DPCD if eDP or DP rev >= 1.4 */
if (intel_dp->dpcd[DP_DPCD_REV] >= 0x14 ||
@@ -4179,6 +4181,12 @@ static void intel_dp_get_dsc_sink_cap(struct intel_dp
*intel_dp)
(int)sizeof(intel_dp->dsc_dpcd),
intel_dp->dsc_dpcd);
}
+ /* FEC is supported only on DP 1.4 */
+ if (!intel_dp_is_edp(intel_dp) && intel_dp->dpcd[DP_DPCD_REV] >= 0x14) {
+ if (drm_dp_dpcd_readb(&intel_dp->aux, DP_FEC_CAPABILITY,
+ intel_dp->fec_dpcd) < 0)
+ DRM_ERROR("Failed to read FEC DPCD register\n");
+ }
}
static bool
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 7b4af8cba279..b87ea052c9ca 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1086,6 +1086,7 @@ struct intel_dp {
uint8_t downstream_ports[DP_MAX_DOWNSTREAM_PORTS];
uint8_t edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE];
+ u8 fec_dpcd[1];
/* source rates */
int num_source_rates;
const int *source_rates;
--
2.17.1
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