drm/amd/display: prefer preferred link cap over verified link settings

[why]
when preferred link cap is set, we should always use
preferred in all validation.
we should not use preferred for some validation but use
verified for others.

[how]
create getter function that gets verified link cap.
if preferred is set, return preferred link settings instead.

Signed-off-by: Wenjing Liu <Wenjing.Liu@amd.com>
Reviewed-by: Nikola Cornij <Nikola.Cornij@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 51b85a8..2b1cd8b 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -597,6 +597,15 @@ uint32_t dc_link_bandwidth_kbps(
 
 }
 
+const struct dc_link_settings *dc_link_get_verified_link_cap(
+               const struct dc_link *link)
+{
+       if (link->preferred_link_setting.lane_count != LANE_COUNT_UNKNOWN &&
+                       link->preferred_link_setting.link_rate != LINK_RATE_UNKNOWN)
+               return &link->preferred_link_setting;
+       return &link->verified_link_cap;
+}
+
 static void destruct(struct dc *dc)
 {
        dc_release_state(dc->current_state);

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 0d8ef8f..acb4f82 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -1549,7 +1549,7 @@ bool dp_validate_mode_timing(
                return true;
 
        /* We always use verified link settings */
-       link_setting = &link->verified_link_cap;
+       link_setting = dc_link_get_verified_link_cap(link);
 
        /* TODO: DYNAMIC_VALIDATION needs to be implemented */
        /*if (flags.DYNAMIC_VALIDATION == 1 &&

diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h
index 7b61fb7..4e26d6e 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dc_link.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_link.h
@@ -250,6 +250,9 @@ uint32_t dc_link_bandwidth_kbps(
        const struct dc_link *link,
        const struct dc_link_settings *link_setting);
 
+const struct dc_link_settings *dc_link_get_verified_link_cap(
+               const struct dc_link *link);
+
 bool dc_submit_i2c(
                struct dc *dc,
                uint32_t link_index,