drm: Remove users of drm_format_num_planes

drm_format_num_planes() is basically a lookup in the drm_format_info table
plus an access to the num_planes field of the appropriate entry.

Most drivers are using this function while having access to the entry
already, which means that we will perform an unnecessary lookup. Removing
the call to drm_format_num_planes is therefore more efficient.

Some drivers will not have access to that entry in the function, but in
this case the overhead is minimal (we just have to call drm_format_info()
to perform the lookup) and we can even avoid multiple, inefficient lookups
in some places that need multiple fields from the drm_format_info
structure.
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/5ffcec9d14a50ed538e37d565f546802452ee672.1558002671.git-series.maxime.ripard@bootlin.com

drivers/gpu/drm/arm/malidp_mw.c

@@ -158,7 +158,7 @@ malidp_mw_encoder_atomic_check(struct drm_encoder *encoder,
 		return -EINVAL;
 	}
 
-	n_planes = drm_format_num_planes(fb->format->format);
+	n_planes = fb->format->num_planes;
 	for (i = 0; i < n_planes; i++) {
 		struct drm_gem_cma_object *obj = drm_fb_cma_get_gem_obj(fb, i);
 		/* memory write buffers are never rotated */

drivers/gpu/drm/armada/armada_fb.c

@@ -87,6 +87,7 @@ struct armada_framebuffer *armada_framebuffer_create(struct drm_device *dev,
 struct drm_framebuffer *armada_fb_create(struct drm_device *dev,
 	struct drm_file *dfile, const struct drm_mode_fb_cmd2 *mode)
 {
+	const struct drm_format_info *info = drm_get_format_info(dev, mode);
 	struct armada_gem_object *obj;
 	struct armada_framebuffer *dfb;
 	int ret;
@@ -97,7 +98,7 @@ struct drm_framebuffer *armada_fb_create(struct drm_device *dev,
 		mode->pitches[2]);
 
 	/* We can only handle a single plane at the moment */
-	if (drm_format_num_planes(mode->pixel_format) > 1 &&
+	if (info->num_planes > 1 &&
 	    (mode->handles[0] != mode->handles[1] ||
 	     mode->handles[0] != mode->handles[2])) {
 		ret = -EINVAL;

drivers/gpu/drm/drm_fourcc.c

@@ -332,22 +332,6 @@ drm_get_format_info(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_get_format_info);
 
-/**
- * drm_format_num_planes - get the number of planes for format
- * @format: pixel format (DRM_FORMAT_*)
- *
- * Returns:
- * The number of planes used by the specified pixel format.
- */
-int drm_format_num_planes(uint32_t format)
-{
-	const struct drm_format_info *info;
-
-	info = drm_format_info(format);
-	return info ? info->num_planes : 1;
-}
-EXPORT_SYMBOL(drm_format_num_planes);
-
 /**
  * drm_format_plane_cpp - determine the bytes per pixel value
  * @format: pixel format (DRM_FORMAT_*)

drivers/gpu/drm/mediatek/mtk_drm_fb.c

@@ -32,10 +32,11 @@ static struct drm_framebuffer *mtk_drm_framebuffer_init(struct drm_device *dev,
 					const struct drm_mode_fb_cmd2 *mode,
 					struct drm_gem_object *obj)
 {
+	const struct drm_format_info *info = drm_get_format_info(dev, mode);
 	struct drm_framebuffer *fb;
 	int ret;
 
-	if (drm_format_num_planes(mode->pixel_format) != 1)
+	if (info->num_planes != 1)
 		return ERR_PTR(-EINVAL);
 
 	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
@@ -88,6 +89,7 @@ struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
 					       struct drm_file *file,
 					       const struct drm_mode_fb_cmd2 *cmd)
 {
+	const struct drm_format_info *info = drm_get_format_info(dev, cmd);
 	struct drm_framebuffer *fb;
 	struct drm_gem_object *gem;
 	unsigned int width = cmd->width;
@@ -95,7 +97,7 @@ struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
 	unsigned int size, bpp;
 	int ret;
 
-	if (drm_format_num_planes(cmd->pixel_format) != 1)
+	if (info->num_planes != 1)
 		return ERR_PTR(-EINVAL);
 
 	gem = drm_gem_object_lookup(file, cmd->handles[0]);

drivers/gpu/drm/meson/meson_overlay.c

@@ -458,7 +458,7 @@ static void meson_overlay_atomic_update(struct drm_plane *plane,
 	}
 
 	/* Update Canvas with buffer address */
-	priv->viu.vd1_planes = drm_format_num_planes(fb->format->format);
+	priv->viu.vd1_planes = fb->format->num_planes;
 
 	switch (priv->viu.vd1_planes) {
 	case 3:

drivers/gpu/drm/msm/disp/dpu1/dpu_formats.c

@@ -1040,10 +1040,11 @@ int dpu_format_check_modified_format(
 		const struct drm_mode_fb_cmd2 *cmd,
 		struct drm_gem_object **bos)
 {
-	int ret, i, num_base_fmt_planes;
+	const struct drm_format_info *info;
 	const struct dpu_format *fmt;
 	struct dpu_hw_fmt_layout layout;
 	uint32_t bos_total_size = 0;
+	int ret, i;
 
 	if (!msm_fmt || !cmd || !bos) {
 		DRM_ERROR("invalid arguments\n");
@@ -1051,14 +1052,16 @@ int dpu_format_check_modified_format(
 	}
 
 	fmt = to_dpu_format(msm_fmt);
-	num_base_fmt_planes = drm_format_num_planes(fmt->base.pixel_format);
+	info = drm_format_info(fmt->base.pixel_format);
+	if (!info)
+		return -EINVAL;
 
 	ret = dpu_format_get_plane_sizes(fmt, cmd->width, cmd->height,
 			&layout, cmd->pitches);
 	if (ret)
 		return ret;
 
-	for (i = 0; i < num_base_fmt_planes; i++) {
+	for (i = 0; i < info->num_planes; i++) {
 		if (!bos[i]) {
 			DRM_ERROR("invalid handle for plane %d\n", i);
 			return -EINVAL;

drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c

@@ -127,13 +127,14 @@ uint32_t mdp5_smp_calculate(struct mdp5_smp *smp,
 		const struct mdp_format *format,
 		u32 width, bool hdecim)
 {
+	const struct drm_format_info *info = drm_format_info(format->base.pixel_format);
 	struct mdp5_kms *mdp5_kms = get_kms(smp);
 	int rev = mdp5_cfg_get_hw_rev(mdp5_kms->cfg);
 	int i, hsub, nplanes, nlines;
 	u32 fmt = format->base.pixel_format;
 	uint32_t blkcfg = 0;
 
-	nplanes = drm_format_num_planes(fmt);
+	nplanes = info->num_planes;
 	hsub = drm_format_horz_chroma_subsampling(fmt);
 
 	/* different if BWC (compressed framebuffer?) enabled: */

drivers/gpu/drm/msm/msm_fb.c

@@ -106,9 +106,11 @@ const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
 struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
 		struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
 {
+	const struct drm_format_info *info = drm_get_format_info(dev,
+								 mode_cmd);
 	struct drm_gem_object *bos[4] = {0};
 	struct drm_framebuffer *fb;
-	int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);
+	int ret, i, n = info->num_planes;
 
 	for (i = 0; i < n; i++) {
 		bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
@@ -135,6 +137,8 @@ struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 {
+	const struct drm_format_info *info = drm_get_format_info(dev,
+								 mode_cmd);
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_kms *kms = priv->kms;
 	struct msm_framebuffer *msm_fb = NULL;
@@ -147,7 +151,7 @@ static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 			dev, mode_cmd, mode_cmd->width, mode_cmd->height,
 			(char *)&mode_cmd->pixel_format);
 
-	n = drm_format_num_planes(mode_cmd->pixel_format);
+	n = info->num_planes;
 	hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
 	vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
 

drivers/gpu/drm/omapdrm/omap_fb.c

@@ -298,7 +298,9 @@ void omap_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
 struct drm_framebuffer *omap_framebuffer_create(struct drm_device *dev,
 		struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
 {
-	unsigned int num_planes = drm_format_num_planes(mode_cmd->pixel_format);
+	const struct drm_format_info *info = drm_get_format_info(dev,
+								 mode_cmd);
+	unsigned int num_planes = info->num_planes;
 	struct drm_gem_object *bos[4];
 	struct drm_framebuffer *fb;
 	int i;

drivers/gpu/drm/rockchip/rockchip_drm_fb.c

@@ -74,19 +74,19 @@ static struct drm_framebuffer *
 rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 			const struct drm_mode_fb_cmd2 *mode_cmd)
 {
+	const struct drm_format_info *info = drm_get_format_info(dev,
+								 mode_cmd);
 	struct drm_framebuffer *fb;
 	struct drm_gem_object *objs[ROCKCHIP_MAX_FB_BUFFER];
 	struct drm_gem_object *obj;
 	unsigned int hsub;
 	unsigned int vsub;
-	int num_planes;
+	int num_planes = min_t(int, info->num_planes, ROCKCHIP_MAX_FB_BUFFER);
 	int ret;
 	int i;
 
 	hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
 	vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
-	num_planes = min(drm_format_num_planes(mode_cmd->pixel_format),
-			 ROCKCHIP_MAX_FB_BUFFER);
 
 	for (i = 0; i < num_planes; i++) {
 		unsigned int width = mode_cmd->width / (i ? hsub : 1);

drivers/gpu/drm/tegra/fb.c

@@ -131,6 +131,7 @@ struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 					struct drm_file *file,
 					const struct drm_mode_fb_cmd2 *cmd)
 {
+	const struct drm_format_info *info = drm_get_format_info(drm, cmd);
 	unsigned int hsub, vsub, i;
 	struct tegra_bo *planes[4];
 	struct drm_gem_object *gem;
@@ -140,7 +141,7 @@ struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 	hsub = drm_format_horz_chroma_subsampling(cmd->pixel_format);
 	vsub = drm_format_vert_chroma_subsampling(cmd->pixel_format);
 
-	for (i = 0; i < drm_format_num_planes(cmd->pixel_format); i++) {
+	for (i = 0; i < info->num_planes; i++) {
 		unsigned int width = cmd->width / (i ? hsub : 1);
 		unsigned int height = cmd->height / (i ? vsub : 1);
 		unsigned int size, bpp;

drivers/gpu/drm/vc4/vc4_plane.c

@@ -592,7 +592,7 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
 	u32 ctl0_offset = vc4_state->dlist_count;
 	const struct hvs_format *format = vc4_get_hvs_format(fb->format->format);
 	u64 base_format_mod = fourcc_mod_broadcom_mod(fb->modifier);
-	int num_planes = drm_format_num_planes(format->drm);
+	int num_planes = fb->format->num_planes;
 	u32 h_subsample, v_subsample;
 	bool mix_plane_alpha;
 	bool covers_screen;

drivers/gpu/drm/zte/zx_plane.c

@@ -199,7 +199,6 @@ static void zx_vl_plane_atomic_update(struct drm_plane *plane,
 	u32 dst_x, dst_y, dst_w, dst_h;
 	uint32_t format;
 	int fmt;
-	int num_planes;
 	int i;
 
 	if (!fb)
@@ -218,9 +217,8 @@ static void zx_vl_plane_atomic_update(struct drm_plane *plane,
 	dst_h = drm_rect_height(dst);
 
 	/* Set up data address registers for Y, Cb and Cr planes */
-	num_planes = drm_format_num_planes(format);
 	paddr_reg = layer + VL_Y;
-	for (i = 0; i < num_planes; i++) {
+	for (i = 0; i < fb->format->num_planes; i++) {
 		cma_obj = drm_fb_cma_get_gem_obj(fb, i);
 		paddr = cma_obj->paddr + fb->offsets[i];
 		paddr += src_y * fb->pitches[i];

include/drm/drm_fourcc.h

@@ -268,7 +268,6 @@ drm_get_format_info(struct drm_device *dev,
 uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth);
 uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
 				     uint32_t bpp, uint32_t depth);
-int drm_format_num_planes(uint32_t format);
 int drm_format_plane_cpp(uint32_t format, int plane);
 int drm_format_horz_chroma_subsampling(uint32_t format);
 int drm_format_vert_chroma_subsampling(uint32_t format);