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b3728905dc
Provide drm_sysfb_get_format(), a helper that finds a specific DRM format from a list of pixel formats. The new function builds upon drm_sysfb_get_format_si(), which finds the DRM format from a given instance of struct screen_info. Now get the screen_info's pixel format in the caller. Allows for matching pixel formats in drivers without screen_info. Convert the callers in efidrm and vesadrm to the new interface. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Acked-by: Julius Werner <jwerner@chromium.org> Link: https://patch.msgid.link/20260217155836.96267-11-tzimmermann@suse.de
60 lines
1.4 KiB
C
60 lines
1.4 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/module.h>
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#include <drm/drm_print.h>
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#include "drm_sysfb_helper.h"
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int drm_sysfb_get_validated_int(struct drm_device *dev, const char *name,
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u64 value, u32 max)
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{
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if (value > min(max, INT_MAX)) {
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drm_warn(dev, "%s of %llu exceeds maximum of %u\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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EXPORT_SYMBOL(drm_sysfb_get_validated_int);
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int drm_sysfb_get_validated_int0(struct drm_device *dev, const char *name,
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u64 value, u32 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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}
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return drm_sysfb_get_validated_int(dev, name, value, max);
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}
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EXPORT_SYMBOL(drm_sysfb_get_validated_int0);
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const struct drm_format_info *drm_sysfb_get_format(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 pixel_format *pixel)
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{
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const struct drm_format_info *format = NULL;
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size_t i;
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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);
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MODULE_DESCRIPTION("Helpers for DRM sysfb drivers");
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MODULE_LICENSE("GPL");
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