drm/radeon/kms: add ioport register access

This is required for the NB_MISC regs on rs780/rs880 which
means HDMI/DVI/DP ports using PCIEPHY won't work without
it. It might also help with s/r (asic init) issues on other
atombios cards.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=28774
and similar issues reported by Alberto Milone.

[airlied: Squash io fix patch]

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Tested-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/gpu/drm/radeon/atom.c b/drivers/gpu/drm/radeon/atom.c
index bded8704326e..8e421f644a54 100644
--- a/drivers/gpu/drm/radeon/atom.c
+++ b/drivers/gpu/drm/radeon/atom.c
@@ -108,12 +108,11 @@ static uint32_t atom_iio_execute(struct atom_context *ctx, int base,
                         base++;
                         break;
                 case ATOM_IIO_READ:
-                        temp = ctx->card->reg_read(ctx->card, CU16(base + 1));
+                        temp = ctx->card->ioreg_read(ctx->card, CU16(base + 1));
                         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);
+                        ctx->card->ioreg_write(ctx->card, CU16(base + 1), temp);
                         base += 3;
                         break;
                 case ATOM_IIO_CLEAR: