[PATCH 16/20] drm/amd/display: Fix encoder disable logic

[Alex Hung]

From: Nicholas Susanto <nicholas.susa...@amd.com>

[WHY]
DENTIST hangs when OTG is off and encoder is on. We were not
disabling the encoder properly when switching from extended mode to
external monitor only.

[HOW]
Disable the encoder using an existing enable/disable fifo helper instead
of enc35_stream_encoder_enable.

Cc: Mario Limonciello <mario.limoncie...@amd.com>
Cc: Alex Deucher <alexander.deuc...@amd.com>
Cc: sta...@vger.kernel.org
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>
Acked-by: Alex Hung <alex.h...@amd.com>
Signed-off-by: Nicholas Susanto <nicholas.susa...@amd.com>
---
 .../amd/display/dc/dcn35/dcn35_dio_stream_encoder.c    | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn35/dcn35_dio_stream_encoder.c 
b/drivers/gpu/drm/amd/display/dc/dcn35/dcn35_dio_stream_encoder.c
index 001f9eb66920..62a8f0b56006 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn35/dcn35_dio_stream_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn35/dcn35_dio_stream_encoder.c
@@ -261,12 +261,6 @@ static void enc35_stream_encoder_enable(
                        /* invalid mode ! */
                        ASSERT_CRITICAL(false);
                }
-
-               REG_UPDATE(DIG_FE_CLK_CNTL, DIG_FE_CLK_EN, 1);
-               REG_UPDATE(DIG_FE_EN_CNTL, DIG_FE_ENABLE, 1);
-       } else {
-               REG_UPDATE(DIG_FE_EN_CNTL, DIG_FE_ENABLE, 0);
-               REG_UPDATE(DIG_FE_CLK_CNTL, DIG_FE_CLK_EN, 0);
        }
 }
 
@@ -436,6 +430,8 @@ static void enc35_disable_fifo(struct stream_encoder *enc)
        struct dcn10_stream_encoder *enc1 = DCN10STRENC_FROM_STRENC(enc);
 
        REG_UPDATE(DIG_FIFO_CTRL0, DIG_FIFO_ENABLE, 0);
+       REG_UPDATE(DIG_FE_EN_CNTL, DIG_FE_ENABLE, 0);
+       REG_UPDATE(DIG_FE_CLK_CNTL, DIG_FE_CLK_EN, 0);
 }
 
 static void enc35_enable_fifo(struct stream_encoder *enc)
@@ -443,6 +439,8 @@ static void enc35_enable_fifo(struct stream_encoder *enc)
        struct dcn10_stream_encoder *enc1 = DCN10STRENC_FROM_STRENC(enc);
 
        REG_UPDATE(DIG_FIFO_CTRL0, DIG_FIFO_READ_START_LEVEL, 0x7);
+       REG_UPDATE(DIG_FE_CLK_CNTL, DIG_FE_CLK_EN, 1);
+       REG_UPDATE(DIG_FE_EN_CNTL, DIG_FE_ENABLE, 1);
 
        enc35_reset_fifo(enc, true);
        enc35_reset_fifo(enc, false);
-- 
2.42.0