Hi Geert Am 15.02.22 um 17:52 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 depths 1/2/4 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 supported
color-indexed modes.
Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_fb_helper.c | 120 +++++++++++++++++++++++++-------
1 file changed, 93 insertions(+), 27 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index ed43b987d306afce..a4afed0de1570841 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -376,12 +376,34 @@ 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;
unsigned int y;
+ void *src;
+ switch (fb->format->depth) {
The depth field is deprecated. It's probably better to use fb->format->format and test against 4CC codes.
+ case 1: + offset += clip->x1 / 8; + len = DIV_ROUND_UP(len + clip->x1 % 8, 8); + break; +
Style: no empty lines here.
+ 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; +
Can we handle case C8 like C[124]? Seems cleaner to me.
+ 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++) {@@ -1231,19 +1253,30 @@ 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) -{ - switch (depth) { - case 8: + const struct drm_format_info *format) +{ + u8 depth = format->depth; + + switch (format->format) { + // FIXME Perhaps + // #define DRM_FORMAT_C0 fourcc_code('C', '0', ' ', ' ')
What is C0?
+ // if ((format & fourcc_code(0xff, 0xf8, 0xff, 0xff) == DRM_FORMAT_C0) ... + case DRM_FORMAT_C1: + case DRM_FORMAT_C2: + case DRM_FORMAT_C4: + case DRM_FORMAT_C8: 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; @@ -1298,7 +1331,9 @@ 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; @@ -1308,22 +1343,34 @@ 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: + bpp = format->depth; + break;
Added C8 here would be more consistent.
+ + default: + if ((drm_format_info_block_width(format, 0) > 1) || + (drm_format_info_block_height(format, 0) > 1)) + return -EINVAL; + + bpp = format->cpp[0] * 8; + 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 || + 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; }@@ -1338,13 +1385,13 @@ 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, @@ -1680,11 +1727,20 @@ 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) + uint32_t format) { info->fix.type = FB_TYPE_PACKED_PIXELS; - info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR : - FB_VISUAL_TRUECOLOR; + switch (format) { + case DRM_FORMAT_C1: + case DRM_FORMAT_C2: + case DRM_FORMAT_C4: + case DRM_FORMAT_C8: + info->fix.visual = FB_VISUAL_PSEUDOCOLOR; + break; + default: + info->fix.visual = FB_VISUAL_TRUECOLOR; + break; + } info->fix.mmio_start = 0; info->fix.mmio_len = 0; info->fix.type_aux = 0; @@ -1701,19 +1757,29 @@ 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;- 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; + switch (format->format) { + case DRM_FORMAT_C1: + case DRM_FORMAT_C2: + case DRM_FORMAT_C4: + info->var.bits_per_pixel = format->depth; + break;
C8.The fbdev helpers look correct to me. I'm not so sure about the usage of the format info; especially the depth field. The docs say that the field is deprecated and should be 0. Maybe depth can be handled within fbdev?
Best regards Thomas
+ + default: + WARN_ON((drm_format_info_block_width(format, 0) > 1) || + (drm_format_info_block_height(format, 0) > 1)); + info->var.bits_per_pixel = format->cpp[0] * 8; + } 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; @@ -1738,7 +1804,7 @@ 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->format); 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
Attachment:
OpenPGP_signature
Description: OpenPGP digital signature
