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| author | Petri Gynther <pgynther@google.com> | 2024-03-15 11:18:38 -0700 |
|---|---|---|
| committer | Petri Gynther <pgynther@google.com> | 2024-03-15 14:19:08 -0700 |
| commit | ab192d3d7ce698a5b6907e439ceea16edab6f279 (patch) | |
| tree | 3f18b6215208dedfdbbcefe0d4324dda7cecac83 | |
| parent | aad4bf72150f7f3e9e6d5fa786074cdc9ba941e3 (diff) | |
| download | display-android-gs-shusky-5.15-android14-qpr3-beta.tar.gz | |
drm: samsung: fix DP CTS test 4.2.2.2 failureandroid-u-qpr3-beta-2.1_r0.8android-gs-shusky-5.15-android14-qpr3-beta
Bug: 329876567
Signed-off-by: Petri Gynther <pgynther@google.com>
Change-Id: I130cf4b5378edfcafcd56d7539875e149389c263
| -rw-r--r-- | samsung/exynos_drm_dp.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/samsung/exynos_drm_dp.c b/samsung/exynos_drm_dp.c index 597fce7..97786f2 100644 --- a/samsung/exynos_drm_dp.c +++ b/samsung/exynos_drm_dp.c @@ -955,6 +955,20 @@ static int dp_link_up(struct dp_device *dp) } } + /* + * Sanity-check DP_DPCD_REV and DP_MAX_LINK_RATE values. + * + * Per DP CTS test 4.2.2.2, on future sinks, these values can be + * higher than 0x14 (DPCD r1.4) and 0x1E (HBR3). + * + * If connected to such sink, adjust the max link rate to HBR3. + */ + if (dpcd[DP_DPCD_REV] > DP_DPCD_REV_14 && dpcd[DP_MAX_LINK_RATE] > DP_LINK_BW_8_1) { + dp_info(dp, "DP Sink: DPCD_%X MAX_LINK_RATE 0x%X, adjust max to HBR3\n", + dpcd[DP_DPCD_REV], dpcd[DP_MAX_LINK_RATE]); + dpcd[DP_MAX_LINK_RATE] = DP_LINK_BW_8_1; + } + /* Fill Sink Capabilities */ dp_fill_sink_caps(dp, dpcd); |