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drm/loongson: Compute dumb-buffer sizes with drm_mode_size_dumb()

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Call drm_mode_size_dumb() to compute dumb-buffer scanline pitch and
buffer size. Align the pitch according to hardware requirements.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Cc: Sui Jingfeng <sui.jingfeng@linux.dev>
Link: https://lore.kernel.org/r/20250821081918.79786-12-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2025-08-21 10:17:18 +02:00
parent b1d0e470f8
commit 5d03809440
1 changed files with 8 additions and 21 deletions
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29
drivers/gpu/drm/loongson/lsdc_gem.c
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@ -6,6 +6,7 @@
#include <linux/dma-buf.h>
#include <drm/drm_debugfs.h>
#include <drm/drm_dumb_buffers.h>
#include <drm/drm_file.h>
#include <drm/drm_gem.h>
#include <drm/drm_prime.h>
@ -204,45 +205,31 @@ int lsdc_dumb_create(struct drm_file *file, struct drm_device *ddev,
const struct lsdc_desc *descp = ldev->descp;
u32 domain = LSDC_GEM_DOMAIN_VRAM;
struct drm_gem_object *gobj;
size_t size;
u32 pitch;
u32 handle;
int ret;
if (!args->width || !args->height)
return -EINVAL;
if (args->bpp != 32 && args->bpp != 16)
return -EINVAL;
pitch = args->width * args->bpp / 8;
pitch = ALIGN(pitch, descp->pitch_align);
size = pitch * args->height;
size = ALIGN(size, PAGE_SIZE);
ret = drm_mode_size_dumb(ddev, args, descp->pitch_align, 0);
if (ret)
return ret;
/* Maximum single bo size allowed is the half vram size available */
if (size > ldev->vram_size / 2) {
drm_err(ddev, "Requesting(%zuMiB) failed\n", size >> 20);
if (args->size > ldev->vram_size / 2) {
drm_err(ddev, "Requesting(%zuMiB) failed\n", (size_t)(args->size >> PAGE_SHIFT));
return -ENOMEM;
}
gobj = lsdc_gem_object_create(ddev, domain, size, false, NULL, NULL);
gobj = lsdc_gem_object_create(ddev, domain, args->size, false, NULL, NULL);
if (IS_ERR(gobj)) {
drm_err(ddev, "Failed to create gem object\n");
return PTR_ERR(gobj);
}
ret = drm_gem_handle_create(file, gobj, &handle);
ret = drm_gem_handle_create(file, gobj, &args->handle);
/* drop reference from allocate, handle holds it now */
drm_gem_object_put(gobj);
if (ret)
return ret;
args->pitch = pitch;
args->size = size;
args->handle = handle;
return 0;
}