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From bbc6f9552e6a997fe753dd95592d323e1b917d2e Mon Sep 17 00:00:00 2001
From: Mykola Lysenko <Mykola.Lysenko@amd.com>
Date: Wed, 9 Mar 2016 05:45:11 -0500
Subject: [PATCH 1498/1565] drm/amd/dal: initial framework for s3 debugging
Adds sysfs driver property to trigger suspend/resume
sequences, thus allow to debug through them w/o actual
s3.
E.g.
# echo 0 > /sys/<path_to_driver>/s3_debug
will trigger suspend sequence and
# echo 1 > /sys/<path_to_driver>/s3_debug
will trigger resume sequence.
Currently it only supports DAL s3 sequences, but could be
expanded to support whole driver sequence.
Change-Id: I1131e07781721462ec771780fe8eb81afe100945
Signed-off-by: Mykola Lysenko <Mykola.Lysenko@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
---
drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm.c | 37 +++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm.c
index 5bef63c..bf4ad69 100644
--- a/drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm.c
@@ -1232,6 +1232,38 @@ static const struct amdgpu_display_funcs dm_dce_v11_0_display_funcs = {
.resume_mc_access = dce_v11_0_resume_mc_access, /* called unconditionally */
};
+#if defined(CONFIG_DEBUG_KERNEL_DAL)
+
+static ssize_t s3_debug_store(
+ struct device *device,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ int ret;
+ int s3_state;
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct drm_device *drm_dev = pci_get_drvdata(pdev);
+ struct amdgpu_device *adev = drm_dev->dev_private;
+
+ ret = kstrtoint(buf, 0, &s3_state);
+
+ if (ret == 0) {
+ if (s3_state) {
+ dm_resume(adev);
+ amdgpu_dm_display_resume(adev);
+ drm_kms_helper_hotplug_event(adev->ddev);
+ } else
+ dm_suspend(adev);
+ }
+
+ return ret == 0 ? count : 0;
+}
+
+DEVICE_ATTR_WO(s3_debug);
+
+#endif
+
static int dm_early_init(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
@@ -1279,6 +1311,11 @@ static int dm_early_init(void *handle)
/* Note: Do NOT change adev->audio_endpt_rreg and
* adev->audio_endpt_wreg because they are initialised in
* amdgpu_device_init() */
+#if defined(CONFIG_DEBUG_KERNEL_DAL)
+ device_create_file(
+ adev->ddev->dev,
+ &dev_attr_s3_debug);
+#endif
return 0;
}
--
1.9.1
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