drm/i915/rkl: Disable PSR2

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 <[e-mail]>
Cc: Rodrigo Vivi <[e-mail]>
Signed-off-by: José Roberto de Souza <[e-mail]>
Signed-off-by: Matt Roper <[e-mail]>
Reviewed-by: Rodrigo Vivi <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/display/intel_psr.c

···
 	}
 
 	/*
+	 * 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
 	 * over PSR2.

drivers/gpu/drm/i915/i915_drv.h

···
 #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)

drivers/gpu/drm/i915/i915_pci.c

···
 	.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, \
···
 	.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, \
···
 	.cpu_transcoder_mask = BIT(TRANSCODER_A) | BIT(TRANSCODER_B) |
 		BIT(TRANSCODER_C),
 	.require_force_probe = 1,
+	.display.has_psr_hw_tracking = 0,
 	.engine_mask =
 		BIT(RCS0) | BIT(BCS0) | BIT(VECS0) | BIT(VCS0),
 };

drivers/gpu/drm/i915/intel_device_info.h

···
 	func(has_modular_fia); \
 	func(has_overlay); \
 	func(has_psr); \
+	func(has_psr_hw_tracking); \
 	func(overlay_needs_physical); \
 	func(supports_tv);