From: Tony Cheng <tony.cheng@xxxxxxx>
REG_UPDATE_2 return the reg value it write out through MMIO
we need to do a REG_READ to confirm the value is written out
Signed-off-by: Tony Cheng <tony.cheng at amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
Acked-by: Harry Wentland <harry.wentland at amd.com>
---
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c
index 1984ac2eb740..2d843b2d5f86 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.c
@@ -42,13 +42,14 @@ void hubp1_set_blank(struct hubp *hubp, bool blank)
{
struct dcn10_hubp *hubp1 = TO_DCN10_HUBP(hubp);
uint32_t blank_en = blank ? 1 : 0;
- uint32_t reg_val = 0;
- reg_val = REG_UPDATE_2(DCHUBP_CNTL,
+ REG_UPDATE_2(DCHUBP_CNTL,
HUBP_BLANK_EN, blank_en,
HUBP_TTU_DISABLE, blank_en);
if (blank) {
+ uint32_t reg_val = REG_READ(DCHUBP_CNTL);
+
if (reg_val) {
/* init sequence workaround: in case HUBP is
* power gated, this wait would timeout.
--
2.14.1
