drm/stm: ltdc: remove reload interrupt

The reload interrupt is not used by the driver. To avoid
unnecessary calls of the interrupt routine, don't enable it.
Solve small typo and add mask to simplify the driver.

Signed-off-by: Yannick Fertre <yannick.fertre@foss.st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240712131453.98597-1-yannick.fertre@foss.st.com
Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>

drivers/gpu/drm/stm/ltdc.c

@@ -170,6 +170,7 @@
 #define IER_RRIE	BIT(3)		/* Register Reload Interrupt Enable */
 #define IER_FUEIE	BIT(6)		/* Fifo Underrun Error Interrupt Enable */
 #define IER_CRCIE	BIT(7)		/* CRC Error Interrupt Enable */
+#define IER_MASK (IER_LIE | IER_FUWIE | IER_TERRIE | IER_RRIE | IER_FUEIE | IER_CRCIE)
 
 #define CPSR_CYPOS	GENMASK(15, 0)	/* Current Y position */
 
@@ -781,7 +782,7 @@ static void ltdc_crtc_atomic_enable(struct drm_crtc *crtc,
 	regmap_write(ldev->regmap, LTDC_BCCR, BCCR_BCBLACK);
 
 	/* Enable IRQ */
-	regmap_set_bits(ldev->regmap, LTDC_IER, IER_FUWIE | IER_FUEIE | IER_RRIE | IER_TERRIE);
+	regmap_set_bits(ldev->regmap, LTDC_IER, IER_FUWIE | IER_FUEIE | IER_TERRIE);
 
 	/* Commit shadow registers = update planes at next vblank */
 	if (!ldev->caps.plane_reg_shadow)
@@ -805,8 +806,8 @@ static void ltdc_crtc_atomic_disable(struct drm_crtc *crtc,
 	for (layer_index = 0; layer_index < ldev->caps.nb_layers; layer_index++)
 		regmap_write_bits(ldev->regmap, LTDC_L1CR + layer_index * LAY_OFS, LXCR_MASK, 0);
 
-	/* disable IRQ */
-	regmap_clear_bits(ldev->regmap, LTDC_IER, IER_FUWIE | IER_FUEIE | IER_RRIE | IER_TERRIE);
+	/* Disable IRQ */
+	regmap_clear_bits(ldev->regmap, LTDC_IER, IER_FUWIE | IER_FUEIE | IER_TERRIE);
 
 	/* immediately commit disable of layers before switching off LTDC */
 	if (!ldev->caps.plane_reg_shadow)
@@ -1987,13 +1988,8 @@ int ltdc_load(struct drm_device *ddev)
 		goto err;
 	}
 
-	/* Disable interrupts */
-	if (ldev->caps.fifo_threshold)
-		regmap_clear_bits(ldev->regmap, LTDC_IER, IER_LIE | IER_RRIE | IER_FUWIE |
-				  IER_TERRIE);
-	else
-		regmap_clear_bits(ldev->regmap, LTDC_IER, IER_LIE | IER_RRIE | IER_FUWIE |
-				  IER_TERRIE | IER_FUEIE);
+	/* Disable all interrupts */
+	regmap_clear_bits(ldev->regmap, LTDC_IER, IER_MASK);
 
 	DRM_DEBUG_DRIVER("ltdc hw version 0x%08x\n", ldev->caps.hw_version);