diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2062-drm-amdgpu-Add-module-parameter-for-specifying-defau.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2062-drm-amdgpu-Add-module-parameter-for-specifying-defau.patch | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2062-drm-amdgpu-Add-module-parameter-for-specifying-defau.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2062-drm-amdgpu-Add-module-parameter-for-specifying-defau.patch new file mode 100644 index 00000000..34c77ff7 --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2062-drm-amdgpu-Add-module-parameter-for-specifying-defau.patch @@ -0,0 +1,71 @@ +From c5cc12cf2d2a4e0303beca687976a8941b258463 Mon Sep 17 00:00:00 2001 +From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> +Date: Thu, 6 Jun 2019 08:44:37 -0400 +Subject: [PATCH 2062/2940] drm/amdgpu: Add module parameter for specifying + default ABM level + +[Why] +It's non trivial to configure or specify an ABM reduction level for +userspace outside of X. There is also no method to specify the default +ABM value at boot time. + +A parameter should be added to configure this. + +[How] +Expose a module parameter that can specify the default ABM level to +use for eDP connectors on DC enabled hardware that loads the DMCU +firmware. + +The default is still disabled (0), but levels can range from 1-4. Levels +control how much the backlight can be reduced, with being the least +amount of reduction and four being the most reduction. + +Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> +Reviewed-by: David Francis <david.francis@amd.com> +--- + drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 + + drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 16 ++++++++++++++++ + 2 files changed, 17 insertions(+) + +diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h +index 7cda01df7f70..92c0f91e262a 100644 +--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h ++++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h +@@ -157,6 +157,7 @@ extern int amdgpu_gpu_recovery; + extern int amdgpu_emu_mode; + extern uint amdgpu_smu_memory_pool_size; + extern uint amdgpu_dc_feature_mask; ++extern uint amdgpu_dm_abm_level; + extern struct amdgpu_mgpu_info mgpu_info; + extern int amdgpu_ras_enable; + extern uint amdgpu_ras_mask; +diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c +index dfa64c5acf16..3fae55da7e1e 100644 +--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c ++++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c +@@ -584,6 +584,22 @@ module_param_named(smu_memory_pool_size, amdgpu_smu_memory_pool_size, uint, 0444 + MODULE_PARM_DESC(dcfeaturemask, "all stable DC features enabled (default))"); + module_param_named(dcfeaturemask, amdgpu_dc_feature_mask, uint, 0444); + ++/** ++ * DOC: abmlevel (uint) ++ * Override the default ABM (Adaptive Backlight Management) level used for DC ++ * enabled hardware. Requires DMCU to be supported and loaded. ++ * Valid levels are 0-4. A value of 0 indicates that ABM should be disabled by ++ * default. Values 1-4 control the maximum allowable brightness reduction via ++ * the ABM algorithm, with 1 being the least reduction and 4 being the most ++ * reduction. ++ * ++ * Defaults to 0, or disabled. Userspace can still override this level later ++ * after boot. ++ */ ++uint amdgpu_dm_abm_level = 0; ++MODULE_PARM_DESC(abmlevel, "ABM level (0 = off (default), 1-4 = backlight reduction level) "); ++module_param_named(abmlevel, amdgpu_dm_abm_level, uint, 0444); ++ + static const struct pci_device_id pciidlist[] = { + #ifdef CONFIG_DRM_AMDGPU_SI + {0x1002, 0x6780, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TAHITI}, +-- +2.17.1 + |