diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2481-drm-amd-display-set-cp25201-to-use-TPS4.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2481-drm-amd-display-set-cp25201-to-use-TPS4.patch | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2481-drm-amd-display-set-cp25201-to-use-TPS4.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2481-drm-amd-display-set-cp25201-to-use-TPS4.patch new file mode 100644 index 00000000..b974bca6 --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/2481-drm-amd-display-set-cp25201-to-use-TPS4.patch @@ -0,0 +1,57 @@ +From 7b1edf5200a14e04821abb7fa93c628982f6d105 Mon Sep 17 00:00:00 2001 +From: Wenjing Liu <Wenjing.Liu@amd.com> +Date: Thu, 14 Sep 2017 18:50:32 -0400 +Subject: [PATCH 2481/4131] drm/amd/display: set cp25201 to use TPS4 + +[Description] +hbr2 compliance eye output is unstable +(toggling on and off) with debugger break. +This caueses intermittent PHY automation failure. +Need to look into the root cause later + +Signed-off-by: Wenjing Liu <Wenjing.Liu@amd.com> +Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> +Acked-by: Harry Wentland <Harry.Wentland@amd.com> +--- + drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 16 ++++++++++++++-- + 1 file changed, 14 insertions(+), 2 deletions(-) + +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 b735782..ced4248 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 +@@ -1700,6 +1700,12 @@ static void dp_test_send_link_training(struct dc_link *link) + dp_retrain_link_dp_test(link, &link_settings, false); + } + ++/* TODO hbr2 compliance eye output is unstable ++ * (toggling on and off) with debugger break ++ * This caueses intermittent PHY automation failure ++ * Need to look into the root cause */ ++static uint8_t force_tps4_for_cp2520 = 1; ++ + static void dp_test_send_phy_test_pattern(struct dc_link *link) + { + union phy_test_pattern dpcd_test_pattern; +@@ -1758,10 +1764,16 @@ static void dp_test_send_phy_test_pattern(struct dc_link *link) + test_pattern = DP_TEST_PATTERN_80BIT_CUSTOM; + break; + case PHY_TEST_PATTERN_CP2520_1: +- test_pattern = DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE; ++ /* CP2520 pattern is unstable, temporarily use TPS4 instead */ ++ test_pattern = (force_tps4_for_cp2520 == 1) ? ++ DP_TEST_PATTERN_TRAINING_PATTERN4 : ++ DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE; + break; + case PHY_TEST_PATTERN_CP2520_2: +- test_pattern = DP_TEST_PATTERN_CP2520_2; ++ /* CP2520 pattern is unstable, temporarily use TPS4 instead */ ++ test_pattern = (force_tps4_for_cp2520 == 1) ? ++ DP_TEST_PATTERN_TRAINING_PATTERN4 : ++ DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE; + break; + case PHY_TEST_PATTERN_CP2520_3: + test_pattern = DP_TEST_PATTERN_TRAINING_PATTERN4; +-- +2.7.4 + |