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video: sandbox: Set a maximum frame-buffer size

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If U-Boot starts with the frame buffer set to 16bpp but then runs a test
that uses 32bpp, there is not enough space. Update the driver to use the
maximum possible frame-buffer size, to avoid this.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2021-11-19 13:23:48 -07:00 committed by Anatolij Gustschin
parent 4057e2772d
commit 301af2388a
1 changed files with 17 additions and 1 deletions
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18
drivers/video/sandbox_sdl.c
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@ -55,10 +55,26 @@ static void set_bpp(struct udevice *dev, enum video_log2_bpp l2bpp)
plat->bpix = l2bpp; plat->bpix = l2bpp;
uc_plat->size = plat->xres * plat->yres * (1 << plat->bpix) / 8; uc_plat->size = plat->xres * plat->yres * VNBYTES(plat->bpix);
/*
* Set up to the maximum size we'll ever need. This is a strange case.
* The video memory is allocated by video_post_bind() called from
* board_init_r(). If a test changes the reoslution so it needs more
* memory later (with sandbox_sdl_set_bpp()), it is too late to make
* the frame buffer larger.
*
* So use a maximum size here.
*/
uc_plat->size = max(uc_plat->size, 1920U * 1080 * VNBYTES(VIDEO_BPP32));
/* Allow space for two buffers, the lower one being the copy buffer */ /* Allow space for two buffers, the lower one being the copy buffer */
log_debug("Frame buffer size %x\n", uc_plat->size); log_debug("Frame buffer size %x\n", uc_plat->size);
/*
* If a copy framebuffer is used, double the size and use the last half
* as the copy, with the first half as the normal frame buffer.
*/
if (IS_ENABLED(CONFIG_VIDEO_COPY)) if (IS_ENABLED(CONFIG_VIDEO_COPY))
uc_plat->size *= 2; uc_plat->size *= 2;
} }