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matroxfb: perform a dummy read of M_STATUS

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I had occasional screen corruption with the matrox framebuffer driver and
I found out that the reason for the corruption is that the hardware
blitter accesses the videoram while it is being written to.

The matrox driver has a macro WaitTillIdle() that should wait until the
blitter is idle, but it sometimes doesn't work. I added a dummy read
mga_inl(M_STATUS) to WaitTillIdle() to fix the problem. The dummy read
will flush the write buffer in the PCI chipset, and the next read of
M_STATUS will return the hardware status.

Since applying this patch, I had no screen corruption at all.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Mikulas Patocka 2014-05-15 06:58:24 -04:00 committed by Tomi Valkeinen
parent 80c68c1e2e
commit 972754cfae
1 changed files with 1 additions and 1 deletions
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2
drivers/video/fbdev/matrox/matroxfb_base.h
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@ -698,7 +698,7 @@ void matroxfb_unregister_driver(struct matroxfb_driver* drv);
#define mga_fifo(n) do {} while ((mga_inl(M_FIFOSTATUS) & 0xFF) < (n))
#define WaitTillIdle() do {} while (mga_inl(M_STATUS) & 0x10000)
#define WaitTillIdle() do { mga_inl(M_STATUS); do {} while (mga_inl(M_STATUS) & 0x10000); } while (0)
/* code speedup */
#ifdef CONFIG_FB_MATROX_MILLENIUM