Mikulas Patocka 972754cfae matroxfb: perform a dummy read of M_STATUS ...

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 <[email protected]>
Cc: [email protected]
Signed-off-by: Tomi Valkeinen <[email protected]>

2014-05-23 13:44:25 +03:00

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g450_pll.c

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g450_pll.h

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i2c-matroxfb.c

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Makefile

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matroxfb_accel.c

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matroxfb_accel.h

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matroxfb_base.c

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matroxfb_base.h

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matroxfb_crtc2.c

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matroxfb_crtc2.h

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matroxfb_DAC1064.c

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matroxfb_DAC1064.h

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matroxfb_g450.c

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matroxfb_g450.h

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matroxfb_maven.c

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matroxfb_maven.h

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matroxfb_misc.c

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matroxfb_misc.h

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matroxfb_Ti3026.c

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matroxfb_Ti3026.h

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