[PATCH 1/9] drm/i915: Disable PSR in Apple panels

["José Roberto de Souza" <jose.souza@intel.com>]

i915 yet don't support PSR in Apple panels, so lets keep it disabled
while we work on that.

Fixes: 598c6cfe0690 (drm/i915/psr: Enable PSR1 on gen-9+ HW)
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 drivers/gpu/drm/drm_dp_helper.c  | 2 ++
 drivers/gpu/drm/i915/intel_psr.c | 6 ++++++
 include/drm/drm_dp_helper.h      | 1 +
 3 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 6d483487f2b4..6b5a19d3e347 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1273,6 +1273,8 @@ static const struct dpcd_quirk dpcd_quirk_list[] = {
 	{ OUI(0x00, 0x22, 0xb9), DEVICE_ID_ANY, true, BIT(DP_DPCD_QUIRK_CONSTANT_N) },
 	/* LG LP140WF6-SPM1 eDP panel */
 	{ OUI(0x00, 0x22, 0xb9), DEVICE_ID('s', 'i', 'v', 'a', 'r', 'T'), false, BIT(DP_DPCD_QUIRK_CONSTANT_N) },
+	/* Apple panels needs some additional handling to support PSR */
+	{ OUI(0x00, 0x10, 0xfa), DEVICE_ID_ANY, false, BIT(DP_DPCD_QUIRK_PSR_NOT_CURRENTLY_SUPPORTED) }
 };
 
 #undef OUI
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 572e626eadff..f5d27a02eb28 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -274,6 +274,12 @@ void intel_psr_init_dpcd(struct intel_dp *intel_dp)
 		DRM_DEBUG_KMS("Panel lacks power state control, PSR cannot be enabled\n");
 		return;
 	}
+
+	if (drm_dp_has_quirk(&intel_dp->desc, DP_DPCD_QUIRK_PSR_NOT_CURRENTLY_SUPPORTED)) {
+		DRM_DEBUG_KMS("PSR support not currently available for this panel\n");
+		return;
+	}
+
 	dev_priv->psr.sink_support = true;
 	dev_priv->psr.sink_sync_latency =
 		intel_dp_get_sink_sync_latency(intel_dp);
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 3314e91f6eb3..db516c48cda3 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1364,6 +1364,7 @@ enum drm_dp_quirk {
 	 * to 16 bits. So will give a constant value (0x8000) for compatability.
 	 */
 	DP_DPCD_QUIRK_CONSTANT_N,
+	DP_DPCD_QUIRK_PSR_NOT_CURRENTLY_SUPPORTED,
 };
 
 /**
-- 
2.19.2

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