Commit 23115b05 authored Nov 12, 2009 by Dave Airlie Committed by Dave Airlie Nov 24, 2009

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>

parent ef630627

drivers/gpu/drm/radeon/atom.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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;