Merge tag 'du-next-20220707' of git://linuxtv.org/pinchartl/media into drm-next

Miscellaneous R-Car DU fixes and enhancements

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/YtIEWkE0nk/8nhUc@pendragon.ideasonboard.com

24 files changed, 64 insertions, 37 deletions

diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.c b/drivers/gpu/drm/rcar-du/rcar_cmm.c
index 382d53f8a22e..e2a67dda4658 100644
--- a/drivers/gpu/drm/rcar-du/rcar_cmm.c
+++ b/drivers/gpu/drm/rcar-du/rcar_cmm.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * rcar_cmm.c -- R-Car Display Unit Color Management Module
+ * R-Car Display Unit Color Management Module
  *
  * Copyright (C) 2019 Jacopo Mondi <jacopo+renesas@jmondi.org>
  */
diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.h b/drivers/gpu/drm/rcar-du/rcar_cmm.h
index b5f7ec6db04a..628072acc98b 100644
--- a/drivers/gpu/drm/rcar-du/rcar_cmm.h
+++ b/drivers/gpu/drm/rcar-du/rcar_cmm.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
- * rcar_cmm.h -- R-Car Display Unit Color Management Module
+ * R-Car Display Unit Color Management Module
  *
  * Copyright (C) 2019 Jacopo Mondi <jacopo+renesas@jmondi.org>
  */
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index f361a604337f..621bbccb95d4 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * rcar_du_crtc.c  --  R-Car Display Unit CRTCs
+ * R-Car Display Unit CRTCs
  *
  * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
@@ -300,6 +300,11 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
 	     | DSMR_DIPM_DISP | DSMR_CSPM;
 	rcar_du_crtc_write(rcrtc, DSMR, dsmr);
 
+	/*
+	 * When the CMM is enabled, an additional offset of 25 pixels must be
+	 * subtracted from the HDS (horizontal display start) and HDE
+	 * (horizontal display end) registers.
+	 */
 	hdse_offset = 19;
 	if (rcrtc->group->cmms_mask & BIT(rcrtc->index % 2))
 		hdse_offset += 25;
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
index 66e8839db708..d0f38a8b3561 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
- * rcar_du_crtc.h  --  R-Car Display Unit CRTCs
+ * R-Car Display Unit CRTCs
  *
  * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
index 957ea97541d5..70d85610d720 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * rcar_du_drv.c  --  R-Car Display Unit DRM driver
+ * R-Car Display Unit DRM driver
  *
  * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
@@ -55,6 +55,7 @@ static const struct rcar_du_device_info rzg1_du_r8a7743_info = {
 		},
 	},
 	.num_lvds = 1,
+	.num_rpf = 4,
 };
 
 static const struct rcar_du_device_info rzg1_du_r8a7745_info = {
@@ -77,6 +78,7 @@ static const struct rcar_du_device_info rzg1_du_r8a7745_info = {
 			.port = 1,
 		},
 	},
+	.num_rpf = 4,
 };
 
 static const struct rcar_du_device_info rzg1_du_r8a77470_info = {
@@ -104,6 +106,7 @@ static const struct rcar_du_device_info rzg1_du_r8a77470_info = {
 			.port = 2,
 		},
 	},
+	.num_rpf = 4,
 };
 
 static const struct rcar_du_device_info rcar_du_r8a774a1_info = {
@@ -133,6 +136,7 @@ static const struct rcar_du_device_info rcar_du_r8a774a1_info = {
 		},
 	},
 	.num_lvds = 1,
+	.num_rpf = 5,
 	.dpll_mask =  BIT(1),
 };
 
@@ -163,6 +167,7 @@ static const struct rcar_du_device_info rcar_du_r8a774b1_info = {
 		},
 	},
 	.num_lvds = 1,
+	.num_rpf = 5,
 	.dpll_mask =  BIT(1),
 };
 
@@ -190,6 +195,7 @@ static const struct rcar_du_device_info rcar_du_r8a774c0_info = {
 		},
 	},
 	.num_lvds = 2,
+	.num_rpf = 4,
 	.lvds_clk_mask =  BIT(1) | BIT(0),
 };
 
@@ -220,6 +226,7 @@ static const struct rcar_du_device_info rcar_du_r8a774e1_info = {
 		},
 	},
 	.num_lvds = 1,
+	.num_rpf = 5,
 	.dpll_mask =  BIT(1),
 };
 
@@ -272,6 +279,7 @@ static const struct rcar_du_device_info rcar_du_r8a7790_info = {
 		},
 	},
 	.num_lvds = 2,
+	.num_rpf = 4,
 };
 
 /* M2-W (r8a7791) and M2-N (r8a7793) are identical */
@@ -297,6 +305,7 @@ static const struct rcar_du_device_info rcar_du_r8a7791_info = {
 		},
 	},
 	.num_lvds = 1,
+	.num_rpf = 4,
 };
 
 static const struct rcar_du_device_info rcar_du_r8a7792_info = {
@@ -317,6 +326,7 @@ static const struct rcar_du_device_info rcar_du_r8a7792_info = {
 			.port = 1,
 		},
 	},
+	.num_rpf = 4,
 };
 
 static const struct rcar_du_device_info rcar_du_r8a7794_info = {
@@ -340,6 +350,7 @@ static const struct rcar_du_device_info rcar_du_r8a7794_info = {
 			.port = 1,
 		},
 	},
+	.num_rpf = 4,
 };
 
 static const struct rcar_du_device_info rcar_du_r8a7795_info = {
@@ -373,6 +384,7 @@ static const struct rcar_du_device_info rcar_du_r8a7795_info = {
 		},
 	},
 	.num_lvds = 1,
+	.num_rpf = 5,
 	.dpll_mask =  BIT(2) | BIT(1),
 };
 
@@ -403,6 +415,7 @@ static const struct rcar_du_device_info rcar_du_r8a7796_info = {
 		},
 	},
 	.num_lvds = 1,
+	.num_rpf = 5,
 	.dpll_mask =  BIT(1),
 };
 
@@ -433,6 +446,7 @@ static const struct rcar_du_device_info rcar_du_r8a77965_info = {
 		},
 	},
 	.num_lvds = 1,
+	.num_rpf = 5,
 	.dpll_mask =  BIT(1),
 };
 
@@ -459,6 +473,7 @@ static const struct rcar_du_device_info rcar_du_r8a77970_info = {
 		},
 	},
 	.num_lvds = 1,
+	.num_rpf = 5,
 };
 
 static const struct rcar_du_device_info rcar_du_r8a7799x_info = {
@@ -486,6 +501,7 @@ static const struct rcar_du_device_info rcar_du_r8a7799x_info = {
 		},
 	},
 	.num_lvds = 2,
+	.num_rpf = 5,
 	.lvds_clk_mask =  BIT(1) | BIT(0),
 };
 
@@ -505,6 +521,7 @@ static const struct rcar_du_device_info rcar_du_r8a779a0_info = {
 			.port = 1,
 		},
 	},
+	.num_rpf = 5,
 	.dsi_clk_mask =  BIT(1) | BIT(0),
 };
 
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
index 101f42df86ea..bfad7775d9a1 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
- * rcar_du_drv.h  --  R-Car Display Unit DRM driver
+ * R-Car Display Unit DRM driver
  *
  * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
@@ -69,6 +69,7 @@ struct rcar_du_output_routing {
  * @channels_mask: bit mask of available DU channels
  * @routes: array of CRTC to output routes, indexed by output (RCAR_DU_OUTPUT_*)
  * @num_lvds: number of internal LVDS encoders
+ * @num_rpf: number of RPFs in VSP
  * @dpll_mask: bit mask of DU channels equipped with a DPLL
  * @dsi_clk_mask: bitmask of channels that can use the DSI clock as dot clock
  * @lvds_clk_mask: bitmask of channels that can use the LVDS clock as dot clock
@@ -80,6 +81,7 @@ struct rcar_du_device_info {
 	unsigned int channels_mask;
 	struct rcar_du_output_routing routes[RCAR_DU_OUTPUT_MAX];
 	unsigned int num_lvds;
+	unsigned int num_rpf;
 	unsigned int dpll_mask;
 	unsigned int dsi_clk_mask;
 	unsigned int lvds_clk_mask;
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
index abf8022eb884..60d6be78323b 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * rcar_du_encoder.c  --  R-Car Display Unit Encoder
+ * R-Car Display Unit Encoder
  *
  * Copyright (C) 2013-2014 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.h b/drivers/gpu/drm/rcar-du/rcar_du_encoder.h
index 73560563fb31..e5ec8fbb3979 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
- * rcar_du_encoder.h  --  R-Car Display Unit Encoder
+ * R-Car Display Unit Encoder
  *
  * Copyright (C) 2013-2014 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_group.c b/drivers/gpu/drm/rcar-du/rcar_du_group.c
index 8665a1dd2186..1fe8581577ed 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_group.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_group.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * rcar_du_group.c  --  R-Car Display Unit Channels Pair
+ * R-Car Display Unit Channels Pair
  *
  * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_group.h b/drivers/gpu/drm/rcar-du/rcar_du_group.h
index e9906609c635..55649ad86a10 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_group.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_group.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
- * rcar_du_group.c  --  R-Car Display Unit Planes and CRTCs Group
+ * R-Car Display Unit Planes and CRTCs Group
  *
  * Copyright (C) 2013-2014 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index 0f09e1ee0390..761451ee5263 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * rcar_du_kms.c  --  R-Car Display Unit Mode Setting
+ * R-Car Display Unit Mode Setting
  *
  * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.h b/drivers/gpu/drm/rcar-du/rcar_du_kms.h
index 789154e19535..f31afeeee05a 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
- * rcar_du_kms.h  --  R-Car Display Unit Mode Setting
+ * R-Car Display Unit Mode Setting
  *
  * Copyright (C) 2013-2014 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.c b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
index e98b76db703a..501d79367e3e 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_plane.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * rcar_du_plane.c  --  R-Car Display Unit Planes
+ * R-Car Display Unit Planes
  *
  * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
@@ -512,6 +512,18 @@ static void rcar_du_plane_setup_format_gen3(struct rcar_du_group *rgrp,
 
 	rcar_du_plane_write(rgrp, index, PnDDCR4,
 			    state->format->edf | PnDDCR4_CODE);
+
+	/*
+	 * On Gen3, some DU channels have two planes, each being wired to a
+	 * separate VSPD instance. The DU can then blend two planes. While
+	 * this feature isn't used by the driver, issues related to alpha
+	 * blending (such as incorrect colors or planes being invisible) may
+	 * still occur if the PnALPHAR register has a stale value. Set the
+	 * register to 0 to avoid this.
+	 */
+
+	/* TODO: Check if alpha-blending should be disabled in PnMR. */
+	rcar_du_plane_write(rgrp, index, PnALPHAR, 0);
 }
 
 static void rcar_du_plane_setup_format(struct rcar_du_group *rgrp,
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.h b/drivers/gpu/drm/rcar-du/rcar_du_plane.h
index 81bbf207ad0e..f9893d7d6dfc 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_plane.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
- * rcar_du_plane.h  --  R-Car Display Unit Planes
+ * R-Car Display Unit Planes
  *
  * Copyright (C) 2013-2014 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_regs.h b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
index 1cdaa51eb9ac..c1bcb0e8b5b4 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_regs.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * rcar_du_regs.h  --  R-Car Display Unit Registers Definitions
+ * R-Car Display Unit Registers Definitions
  *
  * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
index e778fd52f890..dbc68cdabcff 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * rcar_du_vsp.h  --  R-Car Display Unit VSP-Based Compositor
+ * R-Car Display Unit VSP-Based Compositor
  *
  * Copyright (C) 2015 Renesas Electronics Corporation
  *
@@ -407,11 +407,7 @@ int rcar_du_vsp_init(struct rcar_du_vsp *vsp, struct device_node *np,
 	if (ret < 0)
 		return ret;
 
-	 /*
-	  * The VSP2D (Gen3) has 5 RPFs, but the VSP1D (Gen2) is limited to
-	  * 4 RPFs.
-	  */
-	num_planes = rcdu->info->gen >= 3 ? 5 : 4;
+	num_planes = rcdu->info->num_rpf;
 
 	vsp->planes = kcalloc(num_planes, sizeof(*vsp->planes), GFP_KERNEL);
 	if (!vsp->planes)
@@ -437,14 +433,9 @@ int rcar_du_vsp_init(struct rcar_du_vsp *vsp, struct device_node *np,
 		drm_plane_helper_add(&plane->plane,
 				     &rcar_du_vsp_plane_helper_funcs);
 
-		if (type == DRM_PLANE_TYPE_PRIMARY) {
-			drm_plane_create_zpos_immutable_property(&plane->plane,
-								 0);
-		} else {
-			drm_plane_create_alpha_property(&plane->plane);
-			drm_plane_create_zpos_property(&plane->plane, 1, 1,
-						       num_planes - 1);
-		}
+		drm_plane_create_alpha_property(&plane->plane);
+		drm_plane_create_zpos_property(&plane->plane, i, 0,
+					       num_planes - 1);
 
 		vsp->num_planes++;
 	}
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.h b/drivers/gpu/drm/rcar-du/rcar_du_vsp.h
index 9b4724159378..67630f0b6599 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
- * rcar_du_vsp.h  --  R-Car Display Unit VSP-Based Compositor
+ * R-Car Display Unit VSP-Based Compositor
  *
  * Copyright (C) 2015 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_writeback.c b/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
index 4fd6067f6fb4..25f50a297c11 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_writeback.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * rcar_du_writeback.c  --  R-Car Display Unit Writeback Support
+ * R-Car Display Unit Writeback Support
  *
  * Copyright (C) 2019 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  */
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_writeback.h b/drivers/gpu/drm/rcar-du/rcar_du_writeback.h
index fa87ebf8d21f..a71c9c08cafa 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_writeback.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_writeback.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
- * rcar_du_writeback.h  --  R-Car Display Unit Writeback Support
+ * R-Car Display Unit Writeback Support
  *
  * Copyright (C) 2019 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  */
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index 830aac0a2cb4..d85aa4bc7f84 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * rcar_lvds.c  --  R-Car LVDS Encoder
+ * R-Car LVDS Encoder
  *
  * Copyright (C) 2013-2018 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.h b/drivers/gpu/drm/rcar-du/rcar_lvds.h
index eb7c6ef03b00..3097bf749bec 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.h
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * rcar_lvds.h  --  R-Car LVDS Encoder
+ * R-Car LVDS Encoder
  *
  * Copyright (C) 2013-2018 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds_regs.h b/drivers/gpu/drm/rcar-du/rcar_lvds_regs.h
index 87149f2f8056..ab0406a27d33 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds_regs.h
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds_regs.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * rcar_lvds_regs.h  --  R-Car LVDS Interface Registers Definitions
+ * R-Car LVDS Interface Registers Definitions
  *
  * Copyright (C) 2013-2015 Renesas Electronics Corporation
  *
diff --git a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
index 31ed285073e0..62f7eb84ab01 100644
--- a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
+++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * rcar_mipi_dsi.c  --  R-Car MIPI DSI Encoder
+ * R-Car MIPI DSI Encoder
  *
  * Copyright (C) 2020 Renesas Electronics Corporation
  */
diff --git a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi_regs.h b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi_regs.h
index 0e7a9274749f..2eaca54636f3 100644
--- a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi_regs.h
+++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi_regs.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * rcar_mipi_dsi_regs.h  --  R-Car MIPI DSI Interface Registers Definitions
+ * R-Car MIPI DSI Interface Registers Definitions
  *
  * Copyright (C) 2020 Renesas Electronics Corporation
  */