From d4252eee1f7cde7f8b1673626d1b49498c1d4f77 Mon Sep 17 00:00:00 2001
From: Stylon Wang <stylon.wang@amd.com>
Date: Tue, 20 Aug 2019 14:48:37 -0400
Subject: drm/amd/display: Add debugfs entry to force YUV420 output
[Why]
Even if YUV420 is available for video mode, YUV444 is still
automatically selected. This poses a problem for compliance tests.
[How]
Add a per-connector debugfs entry "force_yuv420_output" to force
selection of YUV420 mode.
Signed-off-by: Stylon Wang <stylon.wang@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
.../drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 31 ++++++++++++++++++++++
1 file changed, 31 insertions(+)
(limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c')
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
index f3dfb2887ae0..e29c6314f98c 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -942,6 +942,33 @@ static const struct {
{"aux_dpcd_data", &dp_dpcd_data_debugfs_fops}
};
+/*
+ * Force YUV420 output if available from the given mode
+ */
+static int force_yuv420_output_set(void *data, u64 val)
+{
+ struct amdgpu_dm_connector *connector = data;
+
+ connector->force_yuv420_output = (bool)val;
+
+ return 0;
+}
+
+/*
+ * Check if YUV420 is forced when available from the given mode
+ */
+static int force_yuv420_output_get(void *data, u64 *val)
+{
+ struct amdgpu_dm_connector *connector = data;
+
+ *val = connector->force_yuv420_output;
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(force_yuv420_output_fops, force_yuv420_output_get,
+ force_yuv420_output_set, "%llu\n");
+
void connector_debugfs_init(struct amdgpu_dm_connector *connector)
{
int i;
@@ -955,6 +982,10 @@ void connector_debugfs_init(struct amdgpu_dm_connector *connector)
dp_debugfs_entries[i].fops);
}
}
+
+ debugfs_create_file_unsafe("force_yuv420_output", 0644, dir, connector,
+ &force_yuv420_output_fops);
+
}
/*
--
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