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Subject[PATCH AUTOSEL 5.4 100/350] drm/amd/display: Fix dongle_caps containing stale information.
Date
From: David Galiffi <david.galiffi@amd.com>

[ Upstream commit dd998291dbe92106d8c4a7581c409b356928d711 ]

[WHY]

During detection:
function: get_active_converter_info populates link->dpcd_caps.dongle_caps
only when dpcd_rev >= DPCD_REV_11 and DWN_STRM_PORTX_TYPE is
DOWN_STREAM_DETAILED_HDMI or DOWN_STREAM_DETAILED_DP_PLUS_PLUS.
Otherwise, it is not cleared, and stale information remains.

During mode validation:
function: dp_active_dongle_validate_timing reads
link->dpcd_caps.dongle_caps->dongle_type to determine the maximum
pixel clock to support. This information is now stale and no longer
valid.

[HOW]
dp_active_dongle_validate_timing should be using
link->dpcd_caps->dongle_type instead.

Signed-off-by: David Galiffi <david.galiffi@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@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/core/dc_link.c | 2 +-
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index de1b61595ffbf..efc1d30544bb6 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -2219,7 +2219,7 @@ static bool dp_active_dongle_validate_timing(
break;
}

- if (dongle_caps->dongle_type != DISPLAY_DONGLE_DP_HDMI_CONVERTER ||
+ if (dpcd_caps->dongle_type != DISPLAY_DONGLE_DP_HDMI_CONVERTER ||
dongle_caps->extendedCapValid == false)
return true;

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 9e261dbf2e493..5a583707d198a 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -2545,6 +2545,7 @@ static void get_active_converter_info(
uint8_t data, struct dc_link *link)
{
union dp_downstream_port_present ds_port = { .byte = data };
+ memset(&link->dpcd_caps.dongle_caps, 0, sizeof(link->dpcd_caps.dongle_caps));

/* decode converter info*/
if (!ds_port.fields.PORT_PRESENT) {
--
2.20.1
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