drm/radeon/kms: read back register before writing in IIO.
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>
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@ -107,6 +107,7 @@ static uint32_t atom_iio_execute(struct atom_context *ctx, int base,
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base += 3;
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break;
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case ATOM_IIO_WRITE:
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(void)ctx->card->reg_read(ctx->card, CU16(base + 1));
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ctx->card->reg_write(ctx->card, CU16(base + 1), temp);
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base += 3;
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break;
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