From d2d4f39b1e6407323e568c174e17b022b8f98a40 Mon Sep 17 00:00:00 2001
From: "Kumar, Mahesh" <mahesh1.kumar@intel.com>
Date: Thu, 17 Aug 2017 19:15:29 +0530
Subject: [PATCH] drm/i915/skl+: debugfs entry to control IPC
Git-commit: d2d4f39b1e6407323e568c174e17b022b8f98a40
Patch-mainline: v4.15-rc1
References: FATE#322643 bsc#1055900
This patch creates an entry in debugfs to check the status of IPC.
This can also be used to enable/disable IPC in supported platforms.
Changes since V1:
- fix use of HAS_IPC
- use kstrtobool_from_user (Maarten)
- drm_info log, while enabling IPC (Maarten)
Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170817134529.2839-9-mahesh1.kumar@intel.com
[mlankhorst: enableddisabled -> yesno to match ipc write]
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/i915/i915_debugfs.c | 54 +++++++++++++++++++++++++++++++++++-
1 file changed, 53 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3522,6 +3522,57 @@ static int i915_wa_registers(struct seq_
return 0;
}
+static int i915_ipc_status_show(struct seq_file *m, void *data)
+{
+ struct drm_i915_private *dev_priv = m->private;
+
+ seq_printf(m, "Isochronous Priority Control: %s\n",
+ yesno(dev_priv->ipc_enabled));
+ return 0;
+}
+
+static int i915_ipc_status_open(struct inode *inode, struct file *file)
+{
+ struct drm_i915_private *dev_priv = inode->i_private;
+
+ if (!HAS_IPC(dev_priv))
+ return -ENODEV;
+
+ return single_open(file, i915_ipc_status_show, dev_priv);
+}
+
+static ssize_t i915_ipc_status_write(struct file *file, const char __user *ubuf,
+ size_t len, loff_t *offp)
+{
+ struct seq_file *m = file->private_data;
+ struct drm_i915_private *dev_priv = m->private;
+ int ret;
+ bool enable;
+
+ ret = kstrtobool_from_user(ubuf, len, &enable);
+ if (ret < 0)
+ return ret;
+
+ intel_runtime_pm_get(dev_priv);
+ if (!dev_priv->ipc_enabled && enable)
+ DRM_INFO("Enabling IPC: WM will be proper only after next commit\n");
+ dev_priv->wm.distrust_bios_wm = true;
+ dev_priv->ipc_enabled = enable;
+ intel_enable_ipc(dev_priv);
+ intel_runtime_pm_put(dev_priv);
+
+ return len;
+}
+
+static const struct file_operations i915_ipc_status_fops = {
+ .owner = THIS_MODULE,
+ .open = i915_ipc_status_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = i915_ipc_status_write
+};
+
static int i915_ddb_info(struct seq_file *m, void *unused)
{
struct drm_i915_private *dev_priv = node_to_i915(m->private);
@@ -4858,7 +4909,8 @@ static const struct i915_debugfs_files {
{"i915_dp_test_type", &i915_displayport_test_type_fops},
{"i915_dp_test_active", &i915_displayport_test_active_fops},
{"i915_guc_log_control", &i915_guc_log_control_fops},
- {"i915_hpd_storm_ctl", &i915_hpd_storm_ctl_fops}
+ {"i915_hpd_storm_ctl", &i915_hpd_storm_ctl_fops},
+ {"i915_ipc_status", &i915_ipc_status_fops}
};
int i915_debugfs_register(struct drm_i915_private *dev_priv)