drm: rcar-du: Fix comments to comply with the kernel coding style

To avoid mixing comment styles when new comments complying with the
kernel coding style are introduced, fix all multiline comments in one
go.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

drivers/gpu/drm/rcar-du/rcar_du_crtc.c

@@ -168,7 +168,8 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
 	u32 escr;
 	u32 div;
 
-	/* Compute the clock divisor and select the internal or external dot
+	/*
+	 * Compute the clock divisor and select the internal or external dot
 	 * clock based on the requested frequency.
 	 */
 	clk = clk_get_rate(rcrtc->clock);
@@ -261,12 +262,14 @@ void rcar_du_crtc_route_output(struct drm_crtc *crtc,
 	struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 	struct rcar_du_device *rcdu = rcrtc->group->dev;
 
-	/* Store the route from the CRTC output to the DU output. The DU will be
+	/*
+	 * Store the route from the CRTC output to the DU output. The DU will be
 	 * configured when starting the CRTC.
 	 */
 	rcrtc->outputs |= BIT(output);
 
-	/* Store RGB routing to DPAD0, the hardware will be configured when
+	/*
+	 * Store RGB routing to DPAD0, the hardware will be configured when
 	 * starting the CRTC.
 	 */
 	if (output == RCAR_DU_OUTPUT_DPAD0)
@@ -342,7 +345,8 @@ static void rcar_du_crtc_update_planes(struct rcar_du_crtc *rcrtc)
 		}
 	}
 
-	/* Update the planes to display timing and dot clock generator
+	/*
+	 * Update the planes to display timing and dot clock generator
 	 * associations.
 	 *
 	 * Updating the DPTSR register requires restarting the CRTC group,
@@ -450,7 +454,8 @@ static void rcar_du_crtc_start(struct rcar_du_crtc *rcrtc)
 	/* Start with all planes disabled. */
 	rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR, 0);
 
-	/* Select master sync mode. This enables display operation in master
+	/*
+	 * Select master sync mode. This enables display operation in master
 	 * sync mode (with the HSYNC and VSYNC signals configured as outputs and
 	 * actively driven).
 	 */
@@ -478,7 +483,8 @@ static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
 	if (!rcrtc->started)
 		return;
 
-	/* Disable all planes and wait for the change to take effect. This is
+	/*
+	 * Disable all planes and wait for the change to take effect. This is
 	 * required as the DSnPR registers are updated on vblank, and no vblank
 	 * will occur once the CRTC is stopped. Disabling planes when starting
 	 * the CRTC thus wouldn't be enough as it would start scanning out
@@ -491,7 +497,8 @@ static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
 	rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR, 0);
 	drm_crtc_wait_one_vblank(crtc);
 
-	/* Disable vertical blanking interrupt reporting. We first need to wait
+	/*
+	 * Disable vertical blanking interrupt reporting. We first need to wait
 	 * for page flip completion before stopping the CRTC as userspace
 	 * expects page flips to eventually complete.
 	 */
@@ -502,7 +509,8 @@ static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
 	if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
 		rcar_du_vsp_disable(rcrtc);
 
-	/* Select switch sync mode. This stops display operation and configures
+	/*
+	 * Select switch sync mode. This stops display operation and configures
 	 * the HSYNC and VSYNC signals as inputs.
 	 */
 	rcar_du_crtc_clr_set(rcrtc, DSYSR, DSYSR_TVM_MASK, DSYSR_TVM_SWITCH);

drivers/gpu/drm/rcar-du/rcar_du_drv.c

@@ -39,7 +39,8 @@ static const struct rcar_du_device_info rcar_du_r8a7779_info = {
 	.features = 0,
 	.num_crtcs = 2,
 	.routes = {
-		/* R8A7779 has two RGB outputs and one (currently unsupported)
+		/*
+		 * R8A7779 has two RGB outputs and one (currently unsupported)
 		 * TCON output.
 		 */
 		[RCAR_DU_OUTPUT_DPAD0] = {
@@ -61,7 +62,8 @@ static const struct rcar_du_device_info rcar_du_r8a7790_info = {
 	.quirks = RCAR_DU_QUIRK_ALIGN_128B | RCAR_DU_QUIRK_LVDS_LANES,
 	.num_crtcs = 3,
 	.routes = {
-		/* R8A7790 has one RGB output, two LVDS outputs and one
+		/*
+		 * R8A7790 has one RGB output, two LVDS outputs and one
 		 * (currently unsupported) TCON output.
 		 */
 		[RCAR_DU_OUTPUT_DPAD0] = {
@@ -87,7 +89,8 @@ static const struct rcar_du_device_info rcar_du_r8a7791_info = {
 		  | RCAR_DU_FEATURE_EXT_CTRL_REGS,
 	.num_crtcs = 2,
 	.routes = {
-		/* R8A779[13] has one RGB output, one LVDS output and one
+		/*
+		 * R8A779[13] has one RGB output, one LVDS output and one
 		 * (currently unsupported) TCON output.
 		 */
 		[RCAR_DU_OUTPUT_DPAD0] = {
@@ -127,7 +130,8 @@ static const struct rcar_du_device_info rcar_du_r8a7794_info = {
 		  | RCAR_DU_FEATURE_EXT_CTRL_REGS,
 	.num_crtcs = 2,
 	.routes = {
-		/* R8A7794 has two RGB outputs and one (currently unsupported)
+		/*
+		 * R8A7794 has two RGB outputs and one (currently unsupported)
 		 * TCON output.
 		 */
 		[RCAR_DU_OUTPUT_DPAD0] = {
@@ -149,7 +153,8 @@ static const struct rcar_du_device_info rcar_du_r8a7795_info = {
 		  | RCAR_DU_FEATURE_VSP1_SOURCE,
 	.num_crtcs = 4,
 	.routes = {
-		/* R8A7795 has one RGB output, two HDMI outputs and one
+		/*
+		 * R8A7795 has one RGB output, two HDMI outputs and one
 		 * LVDS output.
 		 */
 		[RCAR_DU_OUTPUT_DPAD0] = {
@@ -180,7 +185,8 @@ static const struct rcar_du_device_info rcar_du_r8a7796_info = {
 		  | RCAR_DU_FEATURE_VSP1_SOURCE,
 	.num_crtcs = 3,
 	.routes = {
-		/* R8A7796 has one RGB output, one LVDS output and one
+		/*
+		 * R8A7796 has one RGB output, one LVDS output and one
 		 * (currently unsupported) HDMI output.
 		 */
 		[RCAR_DU_OUTPUT_DPAD0] = {
@@ -341,7 +347,8 @@ static int rcar_du_probe(struct platform_device *pdev)
 
 	ddev->irq_enabled = 1;
 
-	/* Register the DRM device with the core and the connectors with
+	/*
+	 * Register the DRM device with the core and the connectors with
 	 * sysfs.
 	 */
 	ret = drm_dev_register(ddev, 0);

drivers/gpu/drm/rcar-du/rcar_du_group.c

@@ -64,7 +64,8 @@ static void rcar_du_group_setup_defr8(struct rcar_du_group *rgrp)
 	if (rcdu->info->gen < 3) {
 		defr8 |= DEFR8_DEFE8;
 
-		/* On Gen2 the DEFR8 register for the first group also controls
+		/*
+		 * On Gen2 the DEFR8 register for the first group also controls
 		 * RGB output routing to DPAD0 and VSPD1 routing to DU0/1/2 for
 		 * DU instances that support it.
 		 */
@@ -75,7 +76,8 @@ static void rcar_du_group_setup_defr8(struct rcar_du_group *rgrp)
 				defr8 |= DEFR8_VSCS;
 		}
 	} else {
-		/* On Gen3 VSPD routing can't be configured, but DPAD routing
+		/*
+		 * On Gen3 VSPD routing can't be configured, but DPAD routing
 		 * needs to be set despite having a single option available.
 		 */
 		u32 crtc = ffs(possible_crtcs) - 1;
@@ -124,7 +126,8 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp)
 	if (rcdu->info->gen >= 3)
 		rcar_du_group_write(rgrp, DEFR10, DEFR10_CODE | DEFR10_DEFE10);
 
-	/* Use DS1PR and DS2PR to configure planes priorities and connects the
+	/*
+	 * Use DS1PR and DS2PR to configure planes priorities and connects the
 	 * superposition 0 to DU0 pins. DU1 pins will be configured dynamically.
 	 */
 	rcar_du_group_write(rgrp, DORCR, DORCR_PG1D_DS1 | DORCR_DPRS);
@@ -177,7 +180,8 @@ static void __rcar_du_group_start_stop(struct rcar_du_group *rgrp, bool start)
 
 void rcar_du_group_start_stop(struct rcar_du_group *rgrp, bool start)
 {
-	/* Many of the configuration bits are only updated when the display
+	/*
+	 * Many of the configuration bits are only updated when the display
 	 * reset (DRES) bit in DSYSR is set to 1, disabling *both* CRTCs. Some
 	 * of those bits could be pre-configured, but others (especially the
 	 * bits related to plane assignment to display timing controllers) need
@@ -213,7 +217,8 @@ int rcar_du_set_dpad0_vsp1_routing(struct rcar_du_device *rcdu)
 	if (!rcar_du_has(rcdu, RCAR_DU_FEATURE_EXT_CTRL_REGS))
 		return 0;
 
-	/* RGB output routing to DPAD0 and VSP1D routing to DU0/1/2 are
+	/*
+	 * RGB output routing to DPAD0 and VSP1D routing to DU0/1/2 are
 	 * configured in the DEFR8 register of the first group. As this function
 	 * can be called with the DU0 and DU1 CRTCs disabled, we need to enable
 	 * the first group clock before accessing the register.
@@ -236,7 +241,8 @@ int rcar_du_group_set_routing(struct rcar_du_group *rgrp)
 
 	dorcr &= ~(DORCR_PG2T | DORCR_DK2S | DORCR_PG2D_MASK);
 
-	/* Set the DPAD1 pins sources. Select CRTC 0 if explicitly requested and
+	/*
+	 * Set the DPAD1 pins sources. Select CRTC 0 if explicitly requested and
 	 * CRTC 1 in all other cases to avoid cloning CRTC 0 to DPAD0 and DPAD1
 	 * by default.
 	 */

drivers/gpu/drm/rcar-du/rcar_du_kms.c

@@ -96,7 +96,8 @@ static const struct rcar_du_format_info rcar_du_format_infos[] = {
 		.pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
 		.edf = PnDDCR4_EDF_NONE,
 	},
-	/* The following formats are not supported on Gen2 and thus have no
+	/*
+	 * The following formats are not supported on Gen2 and thus have no
 	 * associated .pnmr or .edf settings.
 	 */
 	{
@@ -153,7 +154,8 @@ int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev,
 	unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 	unsigned int align;
 
-	/* The R8A7779 DU requires a 16 pixels pitch alignment as documented,
+	/*
+	 * The R8A7779 DU requires a 16 pixels pitch alignment as documented,
 	 * but the R8A7790 DU seems to require a 128 bytes pitch alignment.
 	 */
 	if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
@@ -419,7 +421,8 @@ static int rcar_du_properties_init(struct rcar_du_device *rcdu)
 	if (rcdu->props.alpha == NULL)
 		return -ENOMEM;
 
-	/* The color key is expressed as an RGB888 triplet stored in a 32-bit
+	/*
+	 * The color key is expressed as an RGB888 triplet stored in a 32-bit
 	 * integer in XRGB8888 format. Bit 24 is used as a flag to disable (0)
 	 * or enable source color keying (1).
 	 */
@@ -461,7 +464,8 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 	if (ret < 0)
 		return ret;
 
-	/* Initialize vertical blanking interrupts handling. Start with vblank
+	/*
+	 * Initialize vertical blanking interrupts handling. Start with vblank
 	 * disabled for all CRTCs.
 	 */
 	ret = drm_vblank_init(dev, (1 << rcdu->info->num_crtcs) - 1);
@@ -481,7 +485,8 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 		rgrp->index = i;
 		rgrp->num_crtcs = min(rcdu->num_crtcs - 2 * i, 2U);
 
-		/* If we have more than one CRTCs in this group pre-associate
+		/*
+		 * If we have more than one CRTCs in this group pre-associate
 		 * the low-order planes with CRTC 0 and the high-order planes
 		 * with CRTC 1 to minimize flicker occurring when the
 		 * association is changed.
@@ -537,7 +542,8 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 
 	num_encoders = ret;
 
-	/* Set the possible CRTCs and possible clones. There's always at least
+	/*
+	 * Set the possible CRTCs and possible clones. There's always at least
 	 * one way for all encoders to clone each other, set all bits in the
 	 * possible clones field.
 	 */

drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c

@@ -59,7 +59,8 @@ static void rcar_du_lvdsenc_start_gen2(struct rcar_du_lvdsenc *lvds,
 
 	rcar_lvds_write(lvds, LVDPLLCR, pllcr);
 
-	/* Select the input, hardcode mode 0, enable LVDS operation and turn
+	/*
+	 * Select the input, hardcode mode 0, enable LVDS operation and turn
 	 * bias circuitry on.
 	 */
 	lvdcr0 = (lvds->mode << LVDCR0_LVMD_SHIFT) | LVDCR0_BEN | LVDCR0_LVEN;
@@ -73,7 +74,8 @@ static void rcar_du_lvdsenc_start_gen2(struct rcar_du_lvdsenc *lvds,
 			LVDCR1_CHSTBY_GEN2(1) | LVDCR1_CHSTBY_GEN2(0) |
 			LVDCR1_CLKSTBY_GEN2);
 
-	/* Turn the PLL on, wait for the startup delay, and turn the output
+	/*
+	 * Turn the PLL on, wait for the startup delay, and turn the output
 	 * on.
 	 */
 	lvdcr0 |= LVDCR0_PLLON;
@@ -140,7 +142,8 @@ static int rcar_du_lvdsenc_start(struct rcar_du_lvdsenc *lvds,
 	if (ret < 0)
 		return ret;
 
-	/* Hardcode the channels and control signals routing for now.
+	/*
+	 * Hardcode the channels and control signals routing for now.
 	 *
 	 * HSYNC -> CTRL0
 	 * VSYNC -> CTRL1
@@ -202,7 +205,8 @@ void rcar_du_lvdsenc_atomic_check(struct rcar_du_lvdsenc *lvds,
 {
 	struct rcar_du_device *rcdu = lvds->dev;
 
-	/* The internal LVDS encoder has a restricted clock frequency operating
+	/*
+	 * The internal LVDS encoder has a restricted clock frequency operating
 	 * range (30MHz to 150MHz on Gen2, 25.175MHz to 148.5MHz on Gen3). Clamp
 	 * the clock accordingly.
 	 */

drivers/gpu/drm/rcar-du/rcar_du_plane.c

@@ -57,7 +57,8 @@ static bool rcar_du_plane_needs_realloc(struct rcar_du_plane *plane,
 
 	cur_state = to_rcar_plane_state(plane->plane.state);
 
-	/* Lowering the number of planes doesn't strictly require reallocation
+	/*
+	 * Lowering the number of planes doesn't strictly require reallocation
 	 * as the extra hardware plane will be freed when committing, but doing
 	 * so could lead to more fragmentation.
 	 */
@@ -155,7 +156,8 @@ int rcar_du_atomic_check_planes(struct drm_device *dev,
 		dev_dbg(rcdu->dev, "%s: checking plane (%u,%tu)\n", __func__,
 			plane->group->index, plane - plane->group->planes);
 
-		/* If the plane is being disabled we don't need to go through
+		/*
+		 * If the plane is being disabled we don't need to go through
 		 * the full reallocation procedure. Just mark the hardware
 		 * plane(s) as freed.
 		 */
@@ -168,7 +170,8 @@ int rcar_du_atomic_check_planes(struct drm_device *dev,
 			continue;
 		}
 
-		/* If the plane needs to be reallocated mark it as such, and
+		/*
+		 * If the plane needs to be reallocated mark it as such, and
 		 * mark the hardware plane(s) as free.
 		 */
 		if (rcar_du_plane_needs_realloc(plane, plane_state)) {
@@ -186,7 +189,8 @@ int rcar_du_atomic_check_planes(struct drm_device *dev,
 	if (!needs_realloc)
 		return 0;
 
-	/* Grab all plane states for the groups that need reallocation to ensure
+	/*
+	 * Grab all plane states for the groups that need reallocation to ensure
 	 * locking and avoid racy updates. This serializes the update operation,
 	 * but there's not much we can do about it as that's the hardware
 	 * design.
@@ -211,7 +215,8 @@ int rcar_du_atomic_check_planes(struct drm_device *dev,
 			if (IS_ERR(s))
 				return PTR_ERR(s);
 
-			/* If the plane has been freed in the above loop its
+			/*
+			 * If the plane has been freed in the above loop its
 			 * hardware planes must not be added to the used planes
 			 * bitmask. However, the current state doesn't reflect
 			 * the free state yet, as we've modified the new state
@@ -259,14 +264,16 @@ int rcar_du_atomic_check_planes(struct drm_device *dev,
 		dev_dbg(rcdu->dev, "%s: allocating plane (%u,%tu)\n", __func__,
 			plane->group->index, plane - plane->group->planes);
 
-		/* Skip planes that are being disabled or don't need to be
+		/*
+		 * Skip planes that are being disabled or don't need to be
 		 * reallocated.
 		 */
 		if (!plane_state->format ||
 		    !rcar_du_plane_needs_realloc(plane, plane_state))
 			continue;
 
-		/* Try to allocate the plane from the free planes currently
+		/*
+		 * Try to allocate the plane from the free planes currently
 		 * associated with the target CRTC to avoid restarting the CRTC
 		 * group and thus minimize flicker. If it fails fall back to
 		 * allocating from all free planes.
@@ -351,14 +358,16 @@ static void rcar_du_plane_setup_scanout(struct rcar_du_group *rgrp,
 		dma[1] = 0;
 	}
 
-	/* Memory pitch (expressed in pixels). Must be doubled for interlaced
+	/*
+	 * Memory pitch (expressed in pixels). Must be doubled for interlaced
 	 * operation with 32bpp formats.
 	 */
 	rcar_du_plane_write(rgrp, index, PnMWR,
 			    (interlaced && state->format->bpp == 32) ?
 			    pitch * 2 : pitch);
 
-	/* The Y position is expressed in raster line units and must be doubled
+	/*
+	 * The Y position is expressed in raster line units and must be doubled
 	 * for 32bpp formats, according to the R8A7790 datasheet. No mention of
 	 * doubling the Y position is found in the R8A7779 datasheet, but the
 	 * rule seems to apply there as well.
@@ -396,7 +405,8 @@ static void rcar_du_plane_setup_mode(struct rcar_du_group *rgrp,
 	u32 colorkey;
 	u32 pnmr;
 
-	/* The PnALPHAR register controls alpha-blending in 16bpp formats
+	/*
+	 * The PnALPHAR register controls alpha-blending in 16bpp formats
 	 * (ARGB1555 and XRGB1555).
 	 *
 	 * For ARGB, set the alpha value to 0, and enable alpha-blending when
@@ -413,7 +423,8 @@ static void rcar_du_plane_setup_mode(struct rcar_du_group *rgrp,
 
 	pnmr = PnMR_BM_MD | state->format->pnmr;
 
-	/* Disable color keying when requested. YUV formats have the
+	/*
+	 * Disable color keying when requested. YUV formats have the
 	 * PnMR_SPIM_TP_OFF bit set in their pnmr field, disabling color keying
 	 * automatically.
 	 */
@@ -457,7 +468,8 @@ static void rcar_du_plane_setup_format_gen2(struct rcar_du_group *rgrp,
 	u32 ddcr2 = PnDDCR2_CODE;
 	u32 ddcr4;
 
-	/* Data format
+	/*
+	 * Data format
 	 *
 	 * The data format is selected by the DDDF field in PnMR and the EDF
 	 * field in DDCR4.
@@ -589,7 +601,8 @@ static void rcar_du_plane_atomic_update(struct drm_plane *plane,
 
 	rcar_du_plane_setup(rplane);
 
-	/* Check whether the source has changed from memory to live source or
+	/*
+	 * Check whether the source has changed from memory to live source or
 	 * from live source to memory. The source has been configured by the
 	 * VSPS bit in the PnDDCR4 register. Although the datasheet states that
 	 * the bit is updated during vertical blanking, it seems that updates
@@ -726,7 +739,8 @@ int rcar_du_planes_init(struct rcar_du_group *rgrp)
 	unsigned int i;
 	int ret;
 
-	 /* Create one primary plane per CRTC in this group and seven overlay
+	 /*
+	  * Create one primary plane per CRTC in this group and seven overlay
 	  * planes.
 	  */
 	rgrp->num_planes = rgrp->num_crtcs + 7;

drivers/gpu/drm/rcar-du/rcar_du_plane.h

@@ -20,7 +20,8 @@
 struct rcar_du_format_info;
 struct rcar_du_group;
 
-/* The RCAR DU has 8 hardware planes, shared between primary and overlay planes.
+/*
+ * The RCAR DU has 8 hardware planes, shared between primary and overlay planes.
  * As using overlay planes requires at least one of the CRTCs being enabled, no
  * more than 7 overlay planes can be available. We thus create 1 primary plane
  * per CRTC and 7 overlay planes, for a total of up to 9 KMS planes.

drivers/gpu/drm/rcar-du/rcar_du_vsp.c

@@ -73,7 +73,8 @@ void rcar_du_vsp_enable(struct rcar_du_crtc *crtc)
 
 	__rcar_du_plane_setup(crtc->group, &state);
 
-	/* Ensure that the plane source configuration takes effect by requesting
+	/*
+	 * Ensure that the plane source configuration takes effect by requesting
 	 * a restart of the group. See rcar_du_plane_atomic_update() for a more
 	 * detailed explanation.
 	 *
@@ -417,7 +418,8 @@ int rcar_du_vsp_init(struct rcar_du_vsp *vsp)
 	if (ret < 0)
 		return ret;
 
-	 /* The VSP2D (Gen3) has 5 RPFs, but the VSP1D (Gen2) is limited to
+	 /*
+	  * The VSP2D (Gen3) has 5 RPFs, but the VSP1D (Gen2) is limited to
 	  * 4 RPFs.
 	  */
 	vsp->num_planes = rcdu->info->gen >= 3 ? 5 : 4;