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drm/i915: Add debugfs knobs for VLVCHV memory latency values 

Allow tweaking the VLV/CHV memory latencies thorugh sysfs, like we do
for ILK+.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Clint Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2015-06-24 22:00:09 +03:00 committed by Daniel Vetter
parent 6f9c784b7e
commit de38b95cbb
1 changed files with 19 additions and 5 deletions
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24
drivers/gpu/drm/i915/i915_debugfs.c
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@ -4203,8 +4203,15 @@ 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);
@ -4213,9 +4220,9 @@ 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;
@ -4279,7 +4286,7 @@ 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);
@ -4311,11 +4318,18 @@ 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;