[PATCH 10/36] drm/amd/display: Disable GSL when enabling phantom pipe

[Hamza Mahfooz]

From: Alvin Lee <Alvin.Lee2 at amd.com>

[Description]
When enabling phantom pipe on a pipe that was previously
using immediate flip, we have to disable GSL or this will
prevent the update from taking place right away on the phantom
pipe when we enable it in FW

Reviewed-by: Jun Lei <Jun.Lei at amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz at amd.com>
Signed-off-by: Alvin Lee <Alvin.Lee2 at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hubp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hubp.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hubp.c
index 2038cbda33f7..830562f4139d 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hubp.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hubp.c
@@ -79,6 +79,8 @@ void hubp32_phantom_hubp_post_enable(struct hubp *hubp)
 	uint32_t reg_val;
 	struct dcn20_hubp *hubp2 = TO_DCN20_HUBP(hubp);
 
+	/* For phantom pipe enable, disable GSL */
+	REG_UPDATE(DCSURF_FLIP_CONTROL2, SURFACE_GSL_ENABLE, 0);
 	REG_UPDATE(DCHUBP_CNTL, HUBP_BLANK_EN, 1);
 	reg_val = REG_READ(DCHUBP_CNTL);
 	if (reg_val) {
-- 
2.37.2