diff options
Diffstat (limited to 'common/recipes-kernel/linux/files/1071-drm-amd-dal-change-default-to-use-SW-i2c.patch')
| -rw-r--r-- | common/recipes-kernel/linux/files/1071-drm-amd-dal-change-default-to-use-SW-i2c.patch | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/files/1071-drm-amd-dal-change-default-to-use-SW-i2c.patch b/common/recipes-kernel/linux/files/1071-drm-amd-dal-change-default-to-use-SW-i2c.patch new file mode 100644 index 00000000..04202d6b --- /dev/null +++ b/common/recipes-kernel/linux/files/1071-drm-amd-dal-change-default-to-use-SW-i2c.patch @@ -0,0 +1,50 @@ +From 53638aa2435972cf5beaa818b623f02de111bd97 Mon Sep 17 00:00:00 2001 +From: Eric Yang <eric.yang2@amd.com> +Date: Thu, 17 Mar 2016 16:05:47 -0400 +Subject: [PATCH 1071/1110] drm/amd/dal: change default to use SW i2c + +Make SW i2c engine the default. However, since all dces except +dce80 do not create sw i2c engine, they will still use hw i2c. +This allow enabling/disabling of sw i2c through the feature flag +FEATURE_RESTORE_USAGE_I2C_SW_ENGINE. DCE80 is the only dce that +has sw i2c engine enabled right now due to bug in hw i2c. This +fixes EDID read failure on bonaire. No behaviour change on other +dces. + +Signed-off-by: Eric Yang <eric.yang2@amd.com> +Reviewed-by: Harry Wentland <harry.wentland@amd.com> +--- + drivers/gpu/drm/amd/dal/dc/i2caux/i2caux.c | 9 ++++++++- + 1 file changed, 8 insertions(+), 1 deletion(-) + +diff --git a/drivers/gpu/drm/amd/dal/dc/i2caux/i2caux.c b/drivers/gpu/drm/amd/dal/dc/i2caux/i2caux.c +index 2d394cf..a84901e 100644 +--- a/drivers/gpu/drm/amd/dal/dc/i2caux/i2caux.c ++++ b/drivers/gpu/drm/amd/dal/dc/i2caux/i2caux.c +@@ -122,7 +122,15 @@ bool dal_i2caux_submit_i2c_command( + return false; + } + ++ /* ++ * default will be SW, however there is a feature flag in adapter ++ * service that determines whether SW i2c_engine will be available or ++ * not, if sw i2c is not available we will fallback to hw. This feature ++ * flag is set to not creating sw i2c engine for every dce except dce80 ++ * currently ++ */ + switch (cmd->engine) { ++ case I2C_COMMAND_ENGINE_DEFAULT: + case I2C_COMMAND_ENGINE_SW: + /* try to acquire SW engine first, + * acquire HW engine if SW engine not available */ +@@ -133,7 +141,6 @@ bool dal_i2caux_submit_i2c_command( + i2caux, ddc); + break; + case I2C_COMMAND_ENGINE_HW: +- case I2C_COMMAND_ENGINE_DEFAULT: + default: + /* try to acquire HW engine first, + * acquire SW engine if HW engine not available */ +-- +2.7.4 + |