drm/i915: Reorder intel_psr2_config_valid()

Future patches will bring PSR2 selective fetch configuration
validation but most of the configuration checks will be used for HW
tracking and selective fetch so the reoder was necessary.
Reviewed-by: NGwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Signed-off-by: NJosé Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200626010151.221388-2-jose.souza@intel.com

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

@@ -681,21 +681,6 @@ 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
@@ -707,6 +692,12 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 		return false;
 	}
 
+	if (crtc_state->crc_enabled) {
+		drm_dbg_kms(&dev_priv->drm,
+			    "PSR2 not enabled because it would inhibit pipe CRC calculation\n");
+		return false;
+	}
+
 	if (INTEL_GEN(dev_priv) >= 12) {
 		psr_max_h = 5120;
 		psr_max_v = 3200;
@@ -721,14 +712,6 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 		max_bpp = 24;
 	}
 
-	if (crtc_hdisplay > psr_max_h || crtc_vdisplay > psr_max_v) {
-		drm_dbg_kms(&dev_priv->drm,
-			    "PSR2 not enabled, resolution %dx%d > max supported %dx%d\n",
-			    crtc_hdisplay, crtc_vdisplay,
-			    psr_max_h, psr_max_v);
-		return false;
-	}
-
 	if (crtc_state->pipe_bpp > max_bpp) {
 		drm_dbg_kms(&dev_priv->drm,
 			    "PSR2 not enabled, pipe bpp %d > max supported %d\n",
@@ -749,9 +732,26 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 		return false;
 	}
 
-	if (crtc_state->crc_enabled) {
+	/*
+	 * 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,
-			    "PSR2 not enabled because it would inhibit pipe CRC calculation\n");
+			    "No PSR2 HW tracking in the platform\n");
+		return false;
+	}
+
+	if (crtc_hdisplay > psr_max_h || crtc_vdisplay > psr_max_v) {
+		drm_dbg_kms(&dev_priv->drm,
+			    "PSR2 not enabled, resolution %dx%d > max supported %dx%d\n",
+			    crtc_hdisplay, crtc_vdisplay,
+			    psr_max_h, psr_max_v);
 		return false;
 	}