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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
This commit is contained in:
Nagaraju, Vathsala 2017-01-02 17:00:58 +05:30 committed by Rodrigo Vivi
parent f40c484b78
commit 340c93c0a3
3 changed files with 16 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -1156,6 +1156,7 @@ struct i915_psr {
bool link_standby;
bool y_cord_support;
bool colorimetry_support;
bool alpm;
};
enum intel_pch {

10
drivers/gpu/drm/i915/intel_dp.c
View File

@ -3060,6 +3060,14 @@ static bool intel_dp_get_colorimetry_status(struct intel_dp *intel_dp)
return dprx & DP_VSC_SDP_EXT_FOR_COLORIMETRY_SUPPORTED;
}
bool intel_dp_get_alpm_status(struct intel_dp *intel_dp)
{
uint8_t alpm_caps = 0;
drm_dp_dpcd_readb(&intel_dp->aux, DP_RECEIVER_ALPM_CAP, &alpm_caps);
return alpm_caps & DP_ALPM_CAP;
}
/* These are source-specific values. */
uint8_t
intel_dp_voltage_max(struct intel_dp *intel_dp)
@ -3644,6 +3652,8 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp)
intel_dp_get_y_cord_status(intel_dp);
dev_priv->psr.colorimetry_support =
intel_dp_get_colorimetry_status(intel_dp);
dev_priv->psr.alpm =
intel_dp_get_alpm_status(intel_dp);
}
}

6
drivers/gpu/drm/i915/intel_psr.c
View File

@ -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);