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drm/xlnx: 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>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://lore.kernel.org/r/20250821081918.79786-26-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2025-08-21 10:17:32 +02:00
parent a8f81ee99f
commit d861831836
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/xlnx/zynqmp_kms.c
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@ -19,6 +19,7 @@
#include <drm/drm_crtc.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
#include <drm/drm_dumb_buffers.h>
#include <drm/drm_encoder.h>
#include <drm/drm_fbdev_dma.h>
#include <drm/drm_fourcc.h>
@ -363,10 +364,12 @@ static int zynqmp_dpsub_dumb_create(struct drm_file *file_priv,
struct drm_mode_create_dumb *args)
{
struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm);
unsigned int pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
int ret;
/* Enforce the alignment constraints of the DMA engine. */
args->pitch = ALIGN(pitch, dpsub->dma_align);
ret = drm_mode_size_dumb(drm, args, dpsub->dma_align, 0);
if (ret)
return ret;
return drm_gem_dma_dumb_create_internal(file_priv, drm, args);
}