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Message-ID: <21e514f6-4519-6c16-d93f-e35abca80d2a@suse.de>
Date: Mon, 11 Jul 2022 10:42:34 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Geert Uytterhoeven <geert@...ux-m68k.org>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org,
Javier Martinez Canillas <javierm@...hat.com>
Subject: Re: [PATCH v3 06/10] drm/fb-helper: Add support for DRM_FORMAT_C[124]
Hi
Am 08.07.22 um 20:20 schrieb Geert Uytterhoeven:
> Add support for color-indexed frame buffer formats with two, four, and
> sixteen colors to the DRM framebuffer helper functions:
> 1. Add support for 1, 2, and 4 bits per pixel to the damage helper,
> 2. For color-indexed modes, the length of the color bitfields must be
> set to the color depth, else the logo code may pick a logo with too
> many colors. Drop the incorrect DAC width comment, which
> originates from the i915 driver.
> 3. Accept C[124] modes when validating or filling in struct
> fb_var_screeninfo, and use the correct number of bits per pixel.
> 4. Set the visual to FB_VISUAL_PSEUDOCOLOR for all color-indexed
> modes.
>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>
> ---
> If "[PATCH] drm/fb-helper: Remove helpers to change frame buffer
> config"[1] is accepted, the changes to drm_fb_helper_check_var() can
> just be removed.
>
> v3:
> - Fix FB_VISUAL_TRUECOLOR,
> - Add Reviewed-by,
>
> v2:
> - Use drm_format_info_bpp() helper instead of deprecated .depth field
> or format-dependent calculations,
> - Use new .is_color_indexed field instead of checking against a list
> of formats.
>
> [1] Link: https://lore.kernel.org/r/20220629105658.1373770-1-geert@linux-m68k.org
> ---
> drivers/gpu/drm/drm_fb_helper.c | 101 ++++++++++++++++++++++++--------
> 1 file changed, 75 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 1705e8d345aba50a..5098efb374fe64ed 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -376,12 +376,31 @@ static void drm_fb_helper_damage_blit_real(struct drm_fb_helper *fb_helper,
> struct iosys_map *dst)
> {
> struct drm_framebuffer *fb = fb_helper->fb;
> - unsigned int cpp = fb->format->cpp[0];
> - size_t offset = clip->y1 * fb->pitches[0] + clip->x1 * cpp;
> - void *src = fb_helper->fbdev->screen_buffer + offset;
> - size_t len = (clip->x2 - clip->x1) * cpp;
> + size_t offset = clip->y1 * fb->pitches[0];
> + size_t len = clip->x2 - clip->x1;
drm_rect_width() please.
> unsigned int y;
> + void *src;
>
> + switch (drm_format_info_bpp(fb->format, 0)) {
> + case 1:
> + offset += clip->x1 / 8;
> + len = DIV_ROUND_UP(len + clip->x1 % 8, 8);
> + break;
> + case 2:
> + offset += clip->x1 / 4;
> + len = DIV_ROUND_UP(len + clip->x1 % 4, 4);
> + break;
> + case 4:
> + offset += clip->x1 / 2;
> + len = DIV_ROUND_UP(len + clip->x1 % 2, 2);
> + break;
> + default:
> + offset += clip->x1 * fb->format->cpp[0];
> + len *= fb->format->cpp[0];
> + break;
> + }
> +
> + src = fb_helper->fbdev->screen_buffer + offset;
> iosys_map_incr(dst, offset); /* go to first pixel within clip rect */
>
> for (y = clip->y1; y < clip->y2; y++) {
> @@ -1273,19 +1292,23 @@ static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1,
> }
>
> static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var,
> - u8 depth)
> + const struct drm_format_info *format)
> {
> - switch (depth) {
> - case 8:
> + u8 depth = format->depth;
> +
> + if (format->is_color_indexed) {
> var->red.offset = 0;
> var->green.offset = 0;
> var->blue.offset = 0;
> - var->red.length = 8; /* 8bit DAC */
> - var->green.length = 8;
> - var->blue.length = 8;
> + var->red.length = depth;
> + var->green.length = depth;
> + var->blue.length = depth;
> var->transp.offset = 0;
> var->transp.length = 0;
> - break;
> + return;
> + }
> +
> + switch (depth) {
> case 15:
> var->red.offset = 10;
> var->green.offset = 5;
> @@ -1340,7 +1363,9 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
> {
> struct drm_fb_helper *fb_helper = info->par;
> struct drm_framebuffer *fb = fb_helper->fb;
> + const struct drm_format_info *format = fb->format;
> struct drm_device *dev = fb_helper->dev;
> + unsigned int bpp;
>
> if (in_dbg_master())
> return -EINVAL;
> @@ -1350,22 +1375,33 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
> var->pixclock = 0;
> }
>
> - if ((drm_format_info_block_width(fb->format, 0) > 1) ||
> - (drm_format_info_block_height(fb->format, 0) > 1))
> - return -EINVAL;
> + switch (format->format) {
> + case DRM_FORMAT_C1:
> + case DRM_FORMAT_C2:
> + case DRM_FORMAT_C4:
> + /* supported format with sub-byte pixels */
> + break;
> +
> + default:
> + if ((drm_format_info_block_width(format, 0) > 1) ||
> + (drm_format_info_block_height(format, 0) > 1))
> + return -EINVAL;
> + break;
> + }
>
> /*
> * Changes struct fb_var_screeninfo are currently not pushed back
> * to KMS, hence fail if different settings are requested.
> */
> - if (var->bits_per_pixel > fb->format->cpp[0] * 8 ||
> + bpp = drm_format_info_bpp(format, 0);
> + if (var->bits_per_pixel > bpp ||
> var->xres > fb->width || var->yres > fb->height ||
> var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
> drm_dbg_kms(dev, "fb requested width/height/bpp can't fit in current fb "
> "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
> var->xres, var->yres, var->bits_per_pixel,
> var->xres_virtual, var->yres_virtual,
> - fb->width, fb->height, fb->format->cpp[0] * 8);
> + fb->width, fb->height, bpp);
> return -EINVAL;
> }
>
> @@ -1380,13 +1416,13 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
> !var->blue.length && !var->transp.length &&
> !var->red.msb_right && !var->green.msb_right &&
> !var->blue.msb_right && !var->transp.msb_right) {
> - drm_fb_helper_fill_pixel_fmt(var, fb->format->depth);
> + drm_fb_helper_fill_pixel_fmt(var, format);
> }
>
> /*
> * Likewise, bits_per_pixel should be rounded up to a supported value.
> */
> - var->bits_per_pixel = fb->format->cpp[0] * 8;
> + var->bits_per_pixel = bpp;
>
> /*
> * drm fbdev emulation doesn't support changing the pixel format at all,
> @@ -1722,11 +1758,11 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
> }
>
> static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
> - uint32_t depth)
> + bool is_color_indexed)
> {
> info->fix.type = FB_TYPE_PACKED_PIXELS;
> - info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
> - FB_VISUAL_TRUECOLOR;
> + info->fix.visual = is_color_indexed ? FB_VISUAL_PSEUDOCOLOR
> + : FB_VISUAL_TRUECOLOR;
> info->fix.mmio_start = 0;
> info->fix.mmio_len = 0;
> info->fix.type_aux = 0;
> @@ -1743,19 +1779,31 @@ static void drm_fb_helper_fill_var(struct fb_info *info,
> uint32_t fb_width, uint32_t fb_height)
> {
> struct drm_framebuffer *fb = fb_helper->fb;
> + const struct drm_format_info *format = fb->format;
> +
> + switch (format->format) {
> + case DRM_FORMAT_C1:
> + case DRM_FORMAT_C2:
> + case DRM_FORMAT_C4:
> + /* supported format with sub-byte pixels */
> + break;
> +
> + default:
> + WARN_ON((drm_format_info_block_width(format, 0) > 1) ||
> + (drm_format_info_block_height(format, 0) > 1));
> + break;
> + }
>
> - WARN_ON((drm_format_info_block_width(fb->format, 0) > 1) ||
> - (drm_format_info_block_height(fb->format, 0) > 1));
> info->pseudo_palette = fb_helper->pseudo_palette;
> info->var.xres_virtual = fb->width;
> info->var.yres_virtual = fb->height;
> - info->var.bits_per_pixel = fb->format->cpp[0] * 8;
> + info->var.bits_per_pixel = drm_format_info_bpp(format, 0);
> info->var.accel_flags = FB_ACCELF_TEXT;
> info->var.xoffset = 0;
> info->var.yoffset = 0;
> info->var.activate = FB_ACTIVATE_NOW;
>
> - drm_fb_helper_fill_pixel_fmt(&info->var, fb->format->depth);
> + drm_fb_helper_fill_pixel_fmt(&info->var, format);
>
> info->var.xres = fb_width;
> info->var.yres = fb_height;
> @@ -1780,7 +1828,8 @@ void drm_fb_helper_fill_info(struct fb_info *info,
> {
> struct drm_framebuffer *fb = fb_helper->fb;
>
> - drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
> + drm_fb_helper_fill_fix(info, fb->pitches[0],
> + fb->format->is_color_indexed);
> drm_fb_helper_fill_var(info, fb_helper,
> sizes->fb_width, sizes->fb_height);
>
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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