linux-kernel - [PATCH 5.7 015/376] drm/amd/display: fix virtual signal dsc setup

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Message-Id: <20200619141711.088125888@linuxfoundation.org>
Date:   Fri, 19 Jun 2020 16:28:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>,
        Eric Bernstein <Eric.Bernstein@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 015/376] drm/amd/display: fix virtual signal dsc setup

From: Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>

[ Upstream commit d5bef51f084fccafa984b114ff74a01a64a0e2e3 ]

This prevents dpcd access on virtual links.

Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>
Reviewed-by: Eric Bernstein <Eric.Bernstein@....com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
index 51e0ee6e7695..6590f51caefa 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
@@ -400,7 +400,7 @@ static bool dp_set_dsc_on_rx(struct pipe_ctx *pipe_ctx, bool enable)
 	struct dc_stream_state *stream = pipe_ctx->stream;
 	bool result = false;
 
-	if (IS_FPGA_MAXIMUS_DC(dc->ctx->dce_environment))
+	if (dc_is_virtual_signal(stream->signal) || IS_FPGA_MAXIMUS_DC(dc->ctx->dce_environment))
 		result = true;
 	else
 		result = dm_helpers_dp_write_dsc_enable(dc->ctx, stream, enable);
-- 
2.25.1