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x86: fsp: Set up an MTRR for the graphics frame buffer

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The FSP-S may do this but at least for coral it does not. Set this up so
that graphics is not deathly slow.

It isn't clear whether the FSP is expected to set up MTRR. It is not
mentioned in the APL FSP document.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-12-06 21:42:19 -07:00 committed by Bin Meng
parent cf87d3b503
commit e98791ab80
1 changed files with 4 additions and 0 deletions
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4
arch/x86/lib/fsp/fsp_graphics.c
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@ -8,6 +8,7 @@
#include <vbe.h>
#include <video.h>
#include <asm/fsp/fsp_support.h>
#include <asm/mtrr.h>
DECLARE_GLOBAL_DATA_PTR;
@ -97,6 +98,9 @@ static int fsp_video_probe(struct udevice *dev)
if (ret)
goto err;
mtrr_add_request(MTRR_TYPE_WRCOMB, vesa->phys_base_ptr, 256 << 20);
mtrr_commit(true);
printf("%dx%dx%d\n", uc_priv->xsize, uc_priv->ysize,
vesa->bits_per_pixel);