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Commit de38b95c authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Daniel Vetter
Browse files

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: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: default avatarClint Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 6f9c784b

drivers/gpu/drm/i915/i915_debugfs.c

+19 −5
Original line number Diff line number Diff line
@@ -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;