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authorNagaraju, Vathsala <vathsala.nagaraju@intel.com>2017-01-02 17:00:58 +0530
committerRodrigo Vivi <rodrigo.vivi@intel.com>2017-01-12 16:35:20 -0800
commit340c93c0a32acc916bb7655926398b8591e0a30b (patch)
tree2b6c6b77f03acbab1ad9d64f7d851f4fbbe1377b /drivers/gpu/drm/i915/intel_psr.c
parentf40c484b78a3f9d4e469a11e7c6047ea6cb6f3b6 (diff)
drm/i915/psr: enable ALPM for psr2
As per edp1.4 spec , alpm is required for psr2 operation as it's used for all psr2 main link power down management and alpm enable bit must be set for psr2 operation. Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Cc: Jim Bride <jim.bride@linux.intel.com> Signed-off-by: vathsala nagaraju <vathsala.nagaraju@intel.com> Signed-off-by: Patil Deepti <deepti.patil@intel.com> Reviewed-by: Jim Bride <jim.bride@linux.intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1483356663-32668-6-git-send-email-vathsala.nagaraju@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_psr.c')
-rw-r--r--drivers/gpu/drm/i915/intel_psr.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index d57ec780959a..36c404511883 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -209,7 +209,11 @@ static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
drm_dp_dpcd_writeb(&intel_dp->aux,
DP_SINK_DEVICE_AUX_FRAME_SYNC_CONF,
DP_AUX_FRAME_SYNC_ENABLE);
-
+ /* Enable ALPM at sink for psr2 */
+ if (dev_priv->psr.psr2_support && dev_priv->psr.alpm)
+ drm_dp_dpcd_writeb(&intel_dp->aux,
+ DP_RECEIVER_ALPM_CONFIG,
+ DP_ALPM_ENABLE);
if (dev_priv->psr.link_standby)
drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE);