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31eea29d72
Convert drm_sysfb_get_format_si() to lookup the screen_info color format as struct pixel_format with screen_info_pixel_format(). Then search the list of given formats for the screen_info format with pixel_format_equal(). Replaces custom code with helpers. The pixel-compare helper pixel_format_equal() also handles indexed color formats. Prepares for sysfb drivers to support color palettes. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://lore.kernel.org/r/20250714151513.309475-4-tzimmermann@suse.de
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/export.h>
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#include <linux/limits.h>
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#include <linux/minmax.h>
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#include <linux/screen_info.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_print.h>
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#include "drm_sysfb_helper.h"
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static s64 drm_sysfb_get_validated_size0(struct drm_device *dev, const char *name,
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u64 value, u64 max)
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{
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if (!value) {
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drm_warn(dev, "%s of 0 not allowed\n", name);
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return -EINVAL;
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} else if (value > min(max, S64_MAX)) {
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drm_warn(dev, "%s of %llu exceeds maximum of %llu\n", name, value, max);
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return -EINVAL;
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}
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return value;
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}
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int drm_sysfb_get_width_si(struct drm_device *dev, const struct screen_info *si)
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{
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return drm_sysfb_get_validated_int0(dev, "width", si->lfb_width, U16_MAX);
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}
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EXPORT_SYMBOL(drm_sysfb_get_width_si);
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int drm_sysfb_get_height_si(struct drm_device *dev, const struct screen_info *si)
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{
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return drm_sysfb_get_validated_int0(dev, "height", si->lfb_height, U16_MAX);
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}
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EXPORT_SYMBOL(drm_sysfb_get_height_si);
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struct resource *drm_sysfb_get_memory_si(struct drm_device *dev,
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const struct screen_info *si,
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struct resource *res)
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{
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ssize_t num;
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num = screen_info_resources(si, res, 1);
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if (!num) {
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drm_warn(dev, "memory resource not found\n");
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return NULL;
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}
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return res;
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}
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EXPORT_SYMBOL(drm_sysfb_get_memory_si);
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int drm_sysfb_get_stride_si(struct drm_device *dev, const struct screen_info *si,
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const struct drm_format_info *format,
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unsigned int width, unsigned int height, u64 size)
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{
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u64 lfb_linelength = si->lfb_linelength;
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if (!lfb_linelength)
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lfb_linelength = drm_format_info_min_pitch(format, 0, width);
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return drm_sysfb_get_validated_int0(dev, "stride", lfb_linelength, div64_u64(size, height));
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}
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EXPORT_SYMBOL(drm_sysfb_get_stride_si);
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u64 drm_sysfb_get_visible_size_si(struct drm_device *dev, const struct screen_info *si,
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unsigned int height, unsigned int stride, u64 size)
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{
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u64 vsize = PAGE_ALIGN(height * stride);
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return drm_sysfb_get_validated_size0(dev, "visible size", vsize, size);
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}
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EXPORT_SYMBOL(drm_sysfb_get_visible_size_si);
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const struct drm_format_info *drm_sysfb_get_format_si(struct drm_device *dev,
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const struct drm_sysfb_format *formats,
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size_t nformats,
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const struct screen_info *si)
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{
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const struct drm_format_info *format = NULL;
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struct pixel_format pixel;
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size_t i;
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int ret;
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ret = screen_info_pixel_format(si, &pixel);
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if (ret)
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return NULL;
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for (i = 0; i < nformats; ++i) {
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const struct drm_sysfb_format *f = &formats[i];
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if (pixel_format_equal(&pixel, &f->pixel)) {
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format = drm_format_info(f->fourcc);
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break;
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}
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}
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if (!format)
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drm_warn(dev, "No compatible color format found\n");
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return format;
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}
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EXPORT_SYMBOL(drm_sysfb_get_format_si);
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