It's useful to know the dithering state & pipe bpc for IGT testing.
This patch will expose the dithering state for the crtc via a debugfs
file "dither".
Example usage: cat /sys/kernel/debug/dri/0/crtc-0/dither
Cc: Uma Shankar <uma.shankar@xxxxxxxxx>
Cc: Nischal Varide <nischal.varide@xxxxxxxxx>
Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem@xxxxxxxxx>
---
.../drm/i915/display/intel_display_debugfs.c | 32 +++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index 94e5cbd86e77..a6fefc7d5ab9 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -2158,11 +2158,43 @@ static const struct {
{"i915_edp_psr_debug", &i915_edp_psr_debug_fops},
};
+static int dither_state_show(struct seq_file *m, void *data)
+{
+ struct intel_crtc *crtc = to_intel_crtc(m->private);
+ struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+ struct intel_crtc_state *crtc_state;
+ int ret;
+
+ if (!HAS_DISPLAY(dev_priv))
+ return -ENODEV;
+
+ ret = drm_modeset_lock_single_interruptible(&crtc->base.mutex);
+ if (ret)
+ return ret;
+
+ crtc_state = to_intel_crtc_state(crtc->base.state);
+ seq_printf(m, "bpc: %u\n", crtc_state->pipe_bpp / 3);
+ seq_printf(m, "Dither: %u\n", (crtc_state->dither) ? 1 : 0);
+ seq_printf(m, "Dither_CC1: %u\n",
+ (crtc_state->gamma_mode & GAMMA_MODE_DITHER_AFTER_CC1) ? 1 : 0);
+
+ drm_modeset_unlock(&crtc->base.mutex);
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(dither_state);
+
void intel_display_debugfs_register(struct drm_i915_private *i915)
{
struct drm_minor *minor = i915->drm.primary;
+ struct drm_device *dev = &i915->drm;
+ struct drm_crtc *crtc;
int i;
+ drm_for_each_crtc(crtc, dev)
+ debugfs_create_file("dither", 0444, crtc->debugfs_entry, crtc,
+ &dither_state_fops);
+
for (i = 0; i < ARRAY_SIZE(intel_display_debugfs_files); i++) {
debugfs_create_file(intel_display_debugfs_files[i].name,
S_IRUGO | S_IWUSR,
--
2.20.1
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