Hi,
Le mardi 19 mars 2019 à 22:57 +0100, Maxime Ripard a écrit :
> drm_format_horz_chroma_subsampling and drm_format_vert_chroma_subsampling
> are basically a lookup in the drm_format_info table plus an access to the
> hsub and vsub fields 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 these functions 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.
>
> This is amplified by the fact that most of the time the callers will have
> to retrieve both the vsub and hsub fields, meaning that they would perform
> twice the lookup.
Cheers for nuking these two as well!
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>
Cheers,
Paul
> Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 9 +----
> drivers/gpu/drm/drm_fourcc.c | 34 +------------------
> drivers/gpu/drm/imx/ipuv3-plane.c | 15 +++-----
> drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 9 +----
> drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c | 24 +++++--------
> drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c | 2 +-
> drivers/gpu/drm/msm/msm_fb.c | 8 +---
> drivers/gpu/drm/rockchip/rockchip_drm_fb.c | 9 +----
> drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 13 ++-----
> drivers/gpu/drm/tegra/fb.c | 9 +----
> drivers/gpu/drm/vc4/vc4_plane.c | 13 ++-----
> include/drm/drm_fourcc.h | 2 +-
> 12 files changed, 37 insertions(+), 110 deletions(-)
>
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> index e836e2de35ce..fdd607ad27fe 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
> @@ -603,8 +603,6 @@ static int atmel_hlcdc_plane_atomic_check(struct drm_plane *p,
> const struct drm_display_mode *mode;
> struct drm_crtc_state *crtc_state;
> unsigned int tmp;
> - int hsub = 1;
> - int vsub = 1;
> int ret;
> int i;
>
> @@ -642,13 +640,10 @@ static int atmel_hlcdc_plane_atomic_check(struct drm_plane *p,
> if (state->nplanes > ATMEL_HLCDC_LAYER_MAX_PLANES)
> return -EINVAL;
>
> - hsub = drm_format_horz_chroma_subsampling(fb->format->format);
> - vsub = drm_format_vert_chroma_subsampling(fb->format->format);
> -
> for (i = 0; i < state->nplanes; i++) {
> unsigned int offset = 0;
> - int xdiv = i ? hsub : 1;
> - int ydiv = i ? vsub : 1;
> + int xdiv = i ? fb->format->hsub : 1;
> + int ydiv = i ? fb->format->vsub : 1;
>
> state->bpp[i] = fb->format->cpp[i];
> if (!state->bpp[i])
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 22c7fa459f65..04be330b7cae 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -326,40 +326,6 @@ int drm_format_plane_cpp(uint32_t format, int plane)
> EXPORT_SYMBOL(drm_format_plane_cpp);
>
> /**
> - * drm_format_horz_chroma_subsampling - get the horizontal chroma subsampling factor
> - * @format: pixel format (DRM_FORMAT_*)
> - *
> - * Returns:
> - * The horizontal chroma subsampling factor for the
> - * specified pixel format.
> - */
> -int drm_format_horz_chroma_subsampling(uint32_t format)
> -{
> - const struct drm_format_info *info;
> -
> - info = drm_format_info(format);
> - return info ? info->hsub : 1;
> -}
> -EXPORT_SYMBOL(drm_format_horz_chroma_subsampling);
> -
> -/**
> - * drm_format_vert_chroma_subsampling - get the vertical chroma subsampling factor
> - * @format: pixel format (DRM_FORMAT_*)
> - *
> - * Returns:
> - * The vertical chroma subsampling factor for the
> - * specified pixel format.
> - */
> -int drm_format_vert_chroma_subsampling(uint32_t format)
> -{
> - const struct drm_format_info *info;
> -
> - info = drm_format_info(format);
> - return info ? info->vsub : 1;
> -}
> -EXPORT_SYMBOL(drm_format_vert_chroma_subsampling);
> -
> -/**
> * drm_format_plane_width - width of the plane given the first plane
> * @width: width of the first plane
> * @format: pixel format
> diff --git a/drivers/gpu/drm/imx/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3-plane.c
> index 21e964f6ab5c..2530143281b2 100644
> --- a/drivers/gpu/drm/imx/ipuv3-plane.c
> +++ b/drivers/gpu/drm/imx/ipuv3-plane.c
> @@ -115,8 +115,8 @@ drm_plane_state_to_ubo(struct drm_plane_state *state)
> cma_obj = drm_fb_cma_get_gem_obj(fb, 1);
> BUG_ON(!cma_obj);
>
> - x /= drm_format_horz_chroma_subsampling(fb->format->format);
> - y /= drm_format_vert_chroma_subsampling(fb->format->format);
> + x /= fb->format->hsub;
> + y /= fb->format->vsub;
>
> return cma_obj->paddr + fb->offsets[1] + fb->pitches[1] * y +
> fb->format->cpp[1] * x - eba;
> @@ -134,8 +134,8 @@ drm_plane_state_to_vbo(struct drm_plane_state *state)
> cma_obj = drm_fb_cma_get_gem_obj(fb, 2);
> BUG_ON(!cma_obj);
>
> - x /= drm_format_horz_chroma_subsampling(fb->format->format);
> - y /= drm_format_vert_chroma_subsampling(fb->format->format);
> + x /= fb->format->hsub;
> + y /= fb->format->vsub;
>
> return cma_obj->paddr + fb->offsets[2] + fb->pitches[2] * y +
> fb->format->cpp[2] * x - eba;
> @@ -348,7 +348,6 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
> struct drm_framebuffer *old_fb = old_state->fb;
> unsigned long eba, ubo, vbo, old_ubo, old_vbo, alpha_eba;
> bool can_position = (plane->type == DRM_PLANE_TYPE_OVERLAY);
> - int hsub, vsub;
> int ret;
>
> /* Ok to disable */
> @@ -467,10 +466,8 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
> * The x/y offsets must be even in case of horizontal/vertical
> * chroma subsampling.
> */
> - hsub = drm_format_horz_chroma_subsampling(fb->format->format);
> - vsub = drm_format_vert_chroma_subsampling(fb->format->format);
> - if (((state->src.x1 >> 16) & (hsub - 1)) ||
> - ((state->src.y1 >> 16) & (vsub - 1)))
> + if (((state->src.x1 >> 16) & (fb->format->hsub - 1)) ||
> + ((state->src.y1 >> 16) & (fb->format->vsub - 1)))
> return -EINVAL;
> break;
> case DRM_FORMAT_RGB565_A8:
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> index 6aefcd6db46b..a9492c488441 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> @@ -553,14 +553,9 @@ static void _dpu_plane_setup_scaler(struct dpu_plane *pdpu,
> struct dpu_plane_state *pstate,
> const struct dpu_format *fmt, bool color_fill)
> {
> - uint32_t chroma_subsmpl_h, chroma_subsmpl_v;
> + const struct drm_format_info *info = drm_format_info(fmt->base.pixel_format);
>
> /* don't chroma subsample if decimating */
> - chroma_subsmpl_h =
> - drm_format_horz_chroma_subsampling(fmt->base.pixel_format);
> - chroma_subsmpl_v =
> - drm_format_vert_chroma_subsampling(fmt->base.pixel_format);
> -
> /* update scaler. calculate default config for QSEED3 */
> _dpu_plane_setup_scaler3(pdpu, pstate,
> drm_rect_width(&pdpu->pipe_cfg.src_rect),
> @@ -568,7 +563,7 @@ static void _dpu_plane_setup_scaler(struct dpu_plane *pdpu,
> drm_rect_width(&pdpu->pipe_cfg.dst_rect),
> drm_rect_height(&pdpu->pipe_cfg.dst_rect),
> &pstate->scaler3_cfg, fmt,
> - chroma_subsmpl_h, chroma_subsmpl_v);
> + info->hsub, info->vsub);
> }
>
> /**
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
> index be13140967b4..9d9fb6c5fd68 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
> @@ -650,10 +650,10 @@ static int calc_scalex_steps(struct drm_plane *plane,
> uint32_t pixel_format, uint32_t src, uint32_t dest,
> uint32_t phasex_steps[COMP_MAX])
> {
> + const struct drm_format_info *info = drm_format_info(pixel_format);
> struct mdp5_kms *mdp5_kms = get_kms(plane);
> struct device *dev = mdp5_kms->dev->dev;
> uint32_t phasex_step;
> - unsigned int hsub;
> int ret;
>
> ret = calc_phase_step(src, dest, &phasex_step);
> @@ -662,11 +662,9 @@ static int calc_scalex_steps(struct drm_plane *plane,
> return ret;
> }
>
> - hsub = drm_format_horz_chroma_subsampling(pixel_format);
> -
> phasex_steps[COMP_0] = phasex_step;
> phasex_steps[COMP_3] = phasex_step;
> - phasex_steps[COMP_1_2] = phasex_step / hsub;
> + phasex_steps[COMP_1_2] = phasex_step / info->hsub;
>
> return 0;
> }
> @@ -675,10 +673,10 @@ static int calc_scaley_steps(struct drm_plane *plane,
> uint32_t pixel_format, uint32_t src, uint32_t dest,
> uint32_t phasey_steps[COMP_MAX])
> {
> + const struct drm_format_info *info = drm_format_info(pixel_format);
> struct mdp5_kms *mdp5_kms = get_kms(plane);
> struct device *dev = mdp5_kms->dev->dev;
> uint32_t phasey_step;
> - unsigned int vsub;
> int ret;
>
> ret = calc_phase_step(src, dest, &phasey_step);
> @@ -687,11 +685,9 @@ static int calc_scaley_steps(struct drm_plane *plane,
> return ret;
> }
>
> - vsub = drm_format_vert_chroma_subsampling(pixel_format);
> -
> phasey_steps[COMP_0] = phasey_step;
> phasey_steps[COMP_3] = phasey_step;
> - phasey_steps[COMP_1_2] = phasey_step / vsub;
> + phasey_steps[COMP_1_2] = phasey_step / info->vsub;
>
> return 0;
> }
> @@ -699,8 +695,9 @@ static int calc_scaley_steps(struct drm_plane *plane,
> static uint32_t get_scale_config(const struct mdp_format *format,
> uint32_t src, uint32_t dst, bool horz)
> {
> + const struct drm_format_info *info = drm_format_info(format->base.pixel_format);
> bool scaling = format->is_yuv ? true : (src != dst);
> - uint32_t sub, pix_fmt = format->base.pixel_format;
> + uint32_t sub;
> uint32_t ya_filter, uv_filter;
> bool yuv = format->is_yuv;
>
> @@ -708,8 +705,7 @@ static uint32_t get_scale_config(const struct mdp_format *format,
> return 0;
>
> if (yuv) {
> - sub = horz ? drm_format_horz_chroma_subsampling(pix_fmt) :
> - drm_format_vert_chroma_subsampling(pix_fmt);
> + sub = horz ? info->hsub : info->vsub;
> uv_filter = ((src / sub) <= dst) ?
> SCALE_FILTER_BIL : SCALE_FILTER_PCMN;
> }
> @@ -754,7 +750,7 @@ static void mdp5_write_pixel_ext(struct mdp5_kms *mdp5_kms, enum mdp5_pipe pipe,
> uint32_t src_w, int pe_left[COMP_MAX], int pe_right[COMP_MAX],
> uint32_t src_h, int pe_top[COMP_MAX], int pe_bottom[COMP_MAX])
> {
> - uint32_t pix_fmt = format->base.pixel_format;
> + const struct drm_format_info *info = drm_format_info(format->base.pixel_format);
> uint32_t lr, tb, req;
> int i;
>
> @@ -763,8 +759,8 @@ static void mdp5_write_pixel_ext(struct mdp5_kms *mdp5_kms, enum mdp5_pipe pipe,
> uint32_t roi_h = src_h;
>
> if (format->is_yuv && i == COMP_1_2) {
> - roi_w /= drm_format_horz_chroma_subsampling(pix_fmt);
> - roi_h /= drm_format_vert_chroma_subsampling(pix_fmt);
> + roi_w /= info->hsub;
> + roi_h /= info->vsub;
> }
>
> lr = (pe_left[i] >= 0) ?
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
> index 72ab8d89efa4..b30b2f4efc60 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c
> @@ -135,7 +135,7 @@ uint32_t mdp5_smp_calculate(struct mdp5_smp *smp,
> uint32_t blkcfg = 0;
>
> nplanes = info->num_planes;
> - hsub = drm_format_horz_chroma_subsampling(fmt);
> + hsub = info->hsub;
>
> /* different if BWC (compressed framebuffer?) enabled: */
> nlines = 2;
> diff --git a/drivers/gpu/drm/msm/msm_fb.c b/drivers/gpu/drm/msm/msm_fb.c
> index 432beddafb9e..f69c0afd6ec6 100644
> --- a/drivers/gpu/drm/msm/msm_fb.c
> +++ b/drivers/gpu/drm/msm/msm_fb.c
> @@ -145,16 +145,12 @@ static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
> struct drm_framebuffer *fb;
> const struct msm_format *format;
> int ret, i, n;
> - unsigned int hsub, vsub;
>
> DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
> dev, mode_cmd, mode_cmd->width, mode_cmd->height,
> (char *)&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);
> -
> format = kms->funcs->get_format(kms, mode_cmd->pixel_format,
> mode_cmd->modifier[0]);
> if (!format) {
> @@ -180,8 +176,8 @@ static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
> }
>
> for (i = 0; i < n; i++) {
> - unsigned int width = mode_cmd->width / (i ? hsub : 1);
> - unsigned int height = mode_cmd->height / (i ? vsub : 1);
> + unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
> + unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
> unsigned int min_size;
>
> min_size = (height - 1) * mode_cmd->pitches[i]
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> index 606d176d5d96..c318fae28581 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> @@ -79,18 +79,13 @@ rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
> 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 = 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);
> -
> for (i = 0; i < num_planes; i++) {
> - unsigned int width = mode_cmd->width / (i ? hsub : 1);
> - unsigned int height = mode_cmd->height / (i ? vsub : 1);
> + unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
> + unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
> unsigned int min_size;
>
> obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index c7d4c6073ea5..88c3902057f3 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -317,21 +317,18 @@ static void scl_vop_cal_scl_fac(struct vop *vop, const struct vop_win_data *win,
> uint32_t src_w, uint32_t src_h, uint32_t dst_w,
> uint32_t dst_h, uint32_t pixel_format)
> {
> + const struct drm_format_info *info = drm_format_info(pixel_format);
> uint16_t yrgb_hor_scl_mode, yrgb_ver_scl_mode;
> uint16_t cbcr_hor_scl_mode = SCALE_NONE;
> uint16_t cbcr_ver_scl_mode = SCALE_NONE;
> - int hsub = drm_format_horz_chroma_subsampling(pixel_format);
> - int vsub = drm_format_vert_chroma_subsampling(pixel_format);
> - const struct drm_format_info *info;
> bool is_yuv = false;
> - uint16_t cbcr_src_w = src_w / hsub;
> - uint16_t cbcr_src_h = src_h / vsub;
> + uint16_t cbcr_src_w = src_w / info->hsub;
> + uint16_t cbcr_src_h = src_h / info->vsub;
> uint16_t vsu_mode;
> uint16_t lb_mode;
> uint32_t val;
> int vskiplines;
>
> - info = drm_format_info(pixel_format);
>
> if (info->is_yuv)
> is_yuv = true;
> @@ -819,8 +816,8 @@ static void vop_plane_atomic_update(struct drm_plane *plane,
> (state->rotation & DRM_MODE_REFLECT_X) ? 1 : 0);
>
> if (is_yuv) {
> - int hsub = drm_format_horz_chroma_subsampling(fb->format->format);
> - int vsub = drm_format_vert_chroma_subsampling(fb->format->format);
> + int hsub = fb->format->hsub;
> + int vsub = fb->format->vsub;
> int bpp = fb->format->cpp[1];
>
> uv_obj = fb->obj[1];
> diff --git a/drivers/gpu/drm/tegra/fb.c b/drivers/gpu/drm/tegra/fb.c
> index bc8f9afd1b5f..ddf2c764f24c 100644
> --- a/drivers/gpu/drm/tegra/fb.c
> +++ b/drivers/gpu/drm/tegra/fb.c
> @@ -132,18 +132,15 @@ struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
> const struct drm_mode_fb_cmd2 *cmd)
> {
> const struct drm_format_info *info = drm_get_format_info(dev, cmd);
> - unsigned int hsub, vsub, i;
> struct tegra_bo *planes[4];
> struct drm_gem_object *gem;
> struct drm_framebuffer *fb;
> + unsigned int i;
> int err;
>
> - hsub = drm_format_horz_chroma_subsampling(cmd->pixel_format);
> - vsub = drm_format_vert_chroma_subsampling(cmd->pixel_format);
> -
> 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 width = cmd->width / (i ? info->hsub : 1);
> + unsigned int height = cmd->height / (i ? info->vsub : 1);
> unsigned int size, bpp;
>
> gem = drm_gem_object_lookup(file, cmd->handles[i]);
> diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
> index 138a9ff23b70..6605c1b7370d 100644
> --- a/drivers/gpu/drm/vc4/vc4_plane.c
> +++ b/drivers/gpu/drm/vc4/vc4_plane.c
> @@ -310,10 +310,10 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
> struct drm_framebuffer *fb = state->fb;
> struct drm_gem_cma_object *bo = drm_fb_cma_get_gem_obj(fb, 0);
> u32 subpixel_src_mask = (1 << 16) - 1;
> - u32 format = fb->format->format;
> int num_planes = fb->format->num_planes;
> struct drm_crtc_state *crtc_state;
> - u32 h_subsample, v_subsample;
> + u32 h_subsample = fb->format->hsub;
> + u32 v_subsample = fb->format->vsub;
> int i, ret;
>
> crtc_state = drm_atomic_get_existing_crtc_state(state->state,
> @@ -328,9 +328,6 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
> if (ret)
> return ret;
>
> - h_subsample = drm_format_horz_chroma_subsampling(format);
> - v_subsample = drm_format_vert_chroma_subsampling(format);
> -
> for (i = 0; i < num_planes; i++)
> vc4_state->offsets[i] = bo->paddr + fb->offsets[i];
>
> @@ -538,7 +535,8 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
> 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 = fb->format->num_planes;
> - u32 h_subsample, v_subsample;
> + u32 h_subsample = fb->format->hsub;
> + u32 v_subsample = fb->format->vsub;
> bool mix_plane_alpha;
> bool covers_screen;
> u32 scl0, scl1, pitch0;
> @@ -568,9 +566,6 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
> scl1 = vc4_get_scl_field(state, 0);
> }
>
> - h_subsample = drm_format_horz_chroma_subsampling(format->drm);
> - v_subsample = drm_format_vert_chroma_subsampling(format->drm);
> -
> rotation = drm_rotation_simplify(state->rotation,
> DRM_MODE_ROTATE_0 |
> DRM_MODE_REFLECT_X |
> diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> index 41779b327d91..eeec449d6c6a 100644
> --- a/include/drm/drm_fourcc.h
> +++ b/include/drm/drm_fourcc.h
> @@ -269,8 +269,6 @@ 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_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);
> int drm_format_plane_width(int width, uint32_t format, int plane);
> int drm_format_plane_height(int height, uint32_t format, int plane);
> unsigned int drm_format_info_block_width(const struct drm_format_info *info,
--
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com
