[Intel-gfx] [PATCH 09/10] drm/i915: Add debugfs knobs for VLVCHV memory latency values
ville.syrjala at linux.intel.com
ville.syrjala at linux.intel.com
Wed Jun 24 12:00:09 PDT 2015
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
Allow tweaking the VLV/CHV memory latencies thorugh sysfs, like we do
for ILK+.
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 24 +++++++++++++++++++-----
1 file changed, 19 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index c49fe2a..656bb0d 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4180,8 +4180,15 @@ static const struct file_operations i915_displayport_test_type_fops = {
static void wm_latency_show(struct seq_file *m, const uint16_t wm[8])
{
struct drm_device *dev = m->private;
- int num_levels = ilk_wm_max_level(dev) + 1;
int level;
+ int num_levels;
+
+ if (IS_CHERRYVIEW(dev))
+ num_levels = 3;
+ else if (IS_VALLEYVIEW(dev))
+ num_levels = 1;
+ else
+ num_levels = ilk_wm_max_level(dev) + 1;
drm_modeset_lock_all(dev);
@@ -4190,9 +4197,9 @@ static void wm_latency_show(struct seq_file *m, const uint16_t wm[8])
/*
* - WM1+ latency values in 0.5us units
- * - latencies are in us on gen9
+ * - latencies are in us on gen9/vlv/chv
*/
- if (INTEL_INFO(dev)->gen >= 9)
+ if (INTEL_INFO(dev)->gen >= 9 || IS_VALLEYVIEW(dev))
latency *= 10;
else if (level > 0)
latency *= 5;
@@ -4256,7 +4263,7 @@ static int pri_wm_latency_open(struct inode *inode, struct file *file)
{
struct drm_device *dev = inode->i_private;
- if (HAS_GMCH_DISPLAY(dev))
+ if (INTEL_INFO(dev)->gen < 5)
return -ENODEV;
return single_open(file, pri_wm_latency_show, dev);
@@ -4288,11 +4295,18 @@ static ssize_t wm_latency_write(struct file *file, const char __user *ubuf,
struct seq_file *m = file->private_data;
struct drm_device *dev = m->private;
uint16_t new[8] = { 0 };
- int num_levels = ilk_wm_max_level(dev) + 1;
+ int num_levels;
int level;
int ret;
char tmp[32];
+ if (IS_CHERRYVIEW(dev))
+ num_levels = 3;
+ else if (IS_VALLEYVIEW(dev))
+ num_levels = 1;
+ else
+ num_levels = ilk_wm_max_level(dev) + 1;
+
if (len >= sizeof(tmp))
return -EINVAL;
--
2.3.6
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