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drm/ssd130x: Remove hardcoded bits-per-pixel in ssd130x_buf_alloc()

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The driver only supports OLED controllers that have a native DRM_FORMAT_C1
pixel format and that is why it has harcoded a division of the width by 8.

But the driver might be extended to support devices that have a different
pixel format. So it's better to use the struct drm_format_info helpers to
compute the size of the buffer, used to store the pixels in native format.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230609170941.1150941-6-javierm@redhat.com
This commit is contained in:
Javier Martinez Canillas 2023-06-09 19:09:40 +02:00
parent 49d7d581ce
commit e254b584db
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GPG Key ID: C751E590D63F3D69
1 changed files with 9 additions and 2 deletions
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11
drivers/gpu/drm/solomon/ssd130x.c
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@ -150,9 +150,16 @@ static int ssd130x_buf_alloc(struct ssd130x_device *ssd130x)
{ {
unsigned int page_height = ssd130x->device_info->page_height; unsigned int page_height = ssd130x->device_info->page_height;
unsigned int pages = DIV_ROUND_UP(ssd130x->height, page_height); unsigned int pages = DIV_ROUND_UP(ssd130x->height, page_height);
const struct drm_format_info *fi;
unsigned int pitch;
ssd130x->buffer = kcalloc(DIV_ROUND_UP(ssd130x->width, 8), fi = drm_format_info(DRM_FORMAT_C1);
ssd130x->height, GFP_KERNEL); if (!fi)
return -EINVAL;
pitch = drm_format_info_min_pitch(fi, 0, ssd130x->width);
ssd130x->buffer = kcalloc(pitch, ssd130x->height, GFP_KERNEL);
if (!ssd130x->buffer) if (!ssd130x->buffer)
return -ENOMEM; return -ENOMEM;