From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Eric Yang <Eric.Yang2@amd.com>,
        Pavle Kotarac <Pavle.Kotarac@amd.com>,
        Daniel Wheeler <daniel.wheeler@amd.com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.15 088/177] drm/amd/display: Set exit_optimized_pwr_state for DCN31
Date:   Mon, 20 Dec 2021 15:33:58 +0100
Message-Id: <20211220143043.076129992@linuxfoundation.org>
In-Reply-To: <20211220143040.058287525@linuxfoundation.org>
References: <20211220143040.058287525@linuxfoundation.org>
User-Agent: quilt/0.66
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>

[ Upstream commit 7e4d2f30df3fb48f75ce9e96867d42bdddab83ac ]

[Why]
SMU now respects the PHY refclk disable request from driver.

This causes a hang during hotplug when PHY refclk was disabled
because it's not being re-enabled and the transmitter control
starts on dc_link_detect.

[How]
We normally would re-enable the clk with exit_optimized_pwr_state
but this is only set on DCN21 and DCN301. Set it for dcn31 as well.

This fixes DMCUB timeouts in the PHY.

Fixes: 64b1d0e8d500 ("drm/amd/display: Add DCN3.1 HWSEQ")

Reviewed-by: Eric Yang <Eric.Yang2@amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/amd/display/dc/dcn31/dcn31_init.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_init.c b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_init.c
index 40011cd3c8ef0..ac8fb202fd5ee 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_init.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_init.c
@@ -100,6 +100,7 @@ static const struct hw_sequencer_funcs dcn31_funcs = {
 	.z10_save_init = dcn31_z10_save_init,
 	.is_abm_supported = dcn31_is_abm_supported,
 	.set_disp_pattern_generator = dcn30_set_disp_pattern_generator,
+	.exit_optimized_pwr_state = dcn21_exit_optimized_pwr_state,
 	.update_visual_confirm_color = dcn20_update_visual_confirm_color,
 };
 
-- 
2.33.0