[Intel-gfx] [PATCH v2 21/22] drm/i915/rkl: Disable PSR2

[Matt Roper]

From: José Roberto de Souza <jose.souza at intel.com>

RKL doesn't have PSR2 HW tracking, it was replaced by software/manual
tracking.  The driver is required to track the areas that needs update
and program hardware to send selective updates.

So until the software tracking is implemented, PSR2 needs to be disabled
for platforms without PSR2 HW tracking.

BSpec: 50422
BSpec: 50424

Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 15 +++++++++++++++
 drivers/gpu/drm/i915/i915_drv.h          |  2 ++
 drivers/gpu/drm/i915/i915_pci.c          |  3 +++
 drivers/gpu/drm/i915/intel_device_info.h |  1 +
 4 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index a0569fdfeb16..31a04570d262 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -678,6 +678,21 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 		return false;
 	}
 
+	/*
+	 * Some platforms lack PSR2 HW tracking and instead require manual
+	 * tracking by software.  In this case, the driver is required to track
+	 * the areas that need updates and program hardware to send selective
+	 * updates.
+	 *
+	 * So until the software tracking is implemented, PSR2 needs to be
+	 * disabled for platforms without PSR2 HW tracking.
+	 */
+	if (!HAS_PSR_HW_TRACKING(dev_priv)) {
+		drm_dbg_kms(&dev_priv->drm,
+			    "No PSR2 HW tracking in the platform\n");
+		return false;
+	}
+
 	/*
 	 * DSC and PSR2 cannot be enabled simultaneously. If a requested
 	 * resolution requires DSC to be enabled, priority is given to DSC
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 06802f2f1cd5..88b524399c8f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1618,6 +1618,8 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define HAS_DDI(dev_priv)		 (INTEL_INFO(dev_priv)->display.has_ddi)
 #define HAS_FPGA_DBG_UNCLAIMED(dev_priv) (INTEL_INFO(dev_priv)->has_fpga_dbg)
 #define HAS_PSR(dev_priv)		 (INTEL_INFO(dev_priv)->display.has_psr)
+#define HAS_PSR_HW_TRACKING(dev_priv) \
+	(INTEL_INFO(dev_priv)->display.has_psr_hw_tracking)
 #define HAS_TRANSCODER(dev_priv, trans)	 ((INTEL_INFO(dev_priv)->cpu_transcoder_mask & BIT(trans)) != 0)
 
 #define HAS_RC6(dev_priv)		 (INTEL_INFO(dev_priv)->has_rc6)
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 5a470bab2214..2c3b0a7d577d 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -536,6 +536,7 @@ static const struct intel_device_info vlv_info = {
 	.display.has_ddi = 1, \
 	.has_fpga_dbg = 1, \
 	.display.has_psr = 1, \
+	.display.has_psr_hw_tracking = 1, \
 	.display.has_dp_mst = 1, \
 	.has_rc6p = 0 /* RC6p removed-by HSW */, \
 	HSW_PIPE_OFFSETS, \
@@ -690,6 +691,7 @@ static const struct intel_device_info skl_gt4_info = {
 	.display.has_fbc = 1, \
 	.display.has_hdcp = 1, \
 	.display.has_psr = 1, \
+	.display.has_psr_hw_tracking = 1, \
 	.has_runtime_pm = 1, \
 	.display.has_csr = 1, \
 	.has_rc6 = 1, \
@@ -868,6 +870,7 @@ static const struct intel_device_info rkl_info = {
 	PLATFORM(INTEL_ROCKETLAKE),
 	.pipe_mask = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C),
 	.require_force_probe = 1,
+	.display.has_psr_hw_tracking = 0,
 	.engine_mask =
 		BIT(RCS0) | BIT(BCS0) | BIT(VECS0) | BIT(VCS0),
 };
diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index a126984cef7f..b336b50d3e0b 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -147,6 +147,7 @@ enum intel_ppgtt_type {
 	func(has_modular_fia); \
 	func(has_overlay); \
 	func(has_psr); \
+	func(has_psr_hw_tracking); \
 	func(overlay_needs_physical); \
 	func(supports_tv);
 
-- 
2.24.1