On Wed, 26 May 2021, Bhanuprakash Modem <bhanuprakash.mo...@intel.com> wrote:
> 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.shan...@intel.com>
> Cc: Nischal Varide <nischal.var...@intel.com>
> Cc: Matt Roper <matthew.d.ro...@intel.com>
> Signed-off-by: Bhanuprakash Modem <bhanuprakash.mo...@intel.com>
> ---
> .../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;
Unneeded.
> +
> + 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);
Are you looking to duplicate the conditions for enabling this CC1 mode
in IGT, and then checking if the driver set the bit as well?
I thought the direction has been that we don't do this type of
validation in IGT. There is no end to it.
Ville?
> +
> + 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);
> +
See intel_crtc_debugfs_add(), called from intel_crtc_late_register().
> for (i = 0; i < ARRAY_SIZE(intel_display_debugfs_files); i++) {
> debugfs_create_file(intel_display_debugfs_files[i].name,
> S_IRUGO | S_IWUSR,
--
Jani Nikula, Intel Open Source Graphics Center
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