On Thu, Dec 17, 2020 at 14:11, Alex Deucher <alexdeucher@xxxxxxxxx>
wrote:
On Mon, Dec 14, 2020 at 5:21 PM Aurabindo Pillai
<aurabindo.pillai@xxxxxxx> wrote:
[Why&How]
Adds a module parameter to enable experimental freesync video mode
modeset
optimization. Enabling this mode allows the driver to skip a full
modeset when
freesync compatible modes are requested by the userspace. This
paramters also
adds some standard modes based on the connected monitor's VRR range.
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Acked-by: Christian König <christian.koenig at amd.com>
Reviewed-by: Shashank Sharma <shashank.sharma@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 12 ++++++++++++
2 files changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index eed5410947e9..e0942184efdd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -177,6 +177,7 @@ 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_exp_freesync_vid_mode;
extern uint amdgpu_dc_debug_mask;
extern uint amdgpu_dm_abm_level;
extern struct amdgpu_mgpu_info mgpu_info;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index b2a1dd7581bf..ece51ecd53d1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -158,6 +158,7 @@ int amdgpu_mes;
int amdgpu_noretry = -1;
int amdgpu_force_asic_type = -1;
int amdgpu_tmz;
+uint amdgpu_exp_freesync_vid_mode;
int amdgpu_reset_method = -1; /* auto */
int amdgpu_num_kcq = -1;
@@ -786,6 +787,17 @@ module_param_named(abmlevel,
amdgpu_dm_abm_level, uint, 0444);
MODULE_PARM_DESC(tmz, "Enable TMZ feature (-1 = auto, 0 = off
(default), 1 = on)");
module_param_named(tmz, amdgpu_tmz, int, 0444);
+/**
+ * DOC: experimental_freesync_video (uint)
+ * Enabled the optimization to adjust front porch timing to
achieve seamless mode change experience
+ * when setting a freesync supported mode for which full modeset
is not needed.
+ * The default value: 0 (off).
+ */
+MODULE_PARM_DESC(
+ experimental_freesync_video,
+ "Enable freesync modesetting optimization feature (0 = off
(default), 1 = on)");
Maybe just call this freesync_video so that we can change the default
if we decide to at some point.
Sure, will do.
Alex
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