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drm/radeon/kms: read back register before writing in IIO.

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This fixes RH bugzilla #527874.

On resume the atom posting wasn't working, however vbe posting was
going fine, after 2 weeks over irc, and 8 hrs with the hardware,
I tracked it down to the memory device table and it access the MC
registers via IIO, it appears the rv515 atom iio table might not
be fully functional, so adding a readback before doing a write
either provides enough delay to make things resume correctly.

Thanks to Peng Huang at Red Hat for coming to Brisbane.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2009-11-12 15:53:44 +10:00 committed by Dave Airlie
parent ef63062716
commit 23115b0592
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/radeon/atom.c
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@ -107,6 +107,7 @@ static uint32_t atom_iio_execute(struct atom_context *ctx, int base,
base += 3;
break;
case ATOM_IIO_WRITE:
(void)ctx->card->reg_read(ctx->card, CU16(base + 1));
ctx->card->reg_write(ctx->card, CU16(base + 1), temp);
base += 3;
break;