From f6a3f786fdecc08efff1e8cc9b054d584aa439d8 Mon Sep 17 00:00:00 2001
From: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
Date: Thu, 19 May 2022 15:21:48 +0530
Subject: drm/i915/display/debug: Expose crtc current bpc via debugfs
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Git-commit: fa373eb2190115ef2c3597f89c12350d0a250eb0
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849
This new debugfs will expose the currently using bpc by crtc.
It is very useful for verifying whether we enter the correct
output color depth from IGT.
This patch will also add the connector's max supported bpc to
"i915_display_info" debugfs.
Example:
cat /sys/kernel/debug/dri/0/crtc-0/i915_current_bpc
Current: 8
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220519095149.3560034-3-bhanuprakash.modem@intel.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
.../drm/i915/display/intel_display_debugfs.c | 28 +++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index 452d773fd4e3..6c3954479047 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -590,6 +590,8 @@ static void intel_connector_info(struct seq_file *m,
seq_puts(m, "\tHDCP version: ");
intel_hdcp_info(m, intel_connector);
+ seq_printf(m, "\tmax bpc: %u\n", connector->display_info.bpc);
+
intel_panel_info(m, intel_connector);
seq_printf(m, "\tmodes:\n");
@@ -2202,6 +2204,29 @@ static const struct file_operations i915_dsc_bpp_fops = {
.write = i915_dsc_bpp_write
};
+/*
+ * Returns the Current CRTC's bpc.
+ * Example usage: cat /sys/kernel/debug/dri/0/crtc-0/i915_current_bpc
+ */
+static int i915_current_bpc_show(struct seq_file *m, void *data)
+{
+ struct intel_crtc *crtc = to_intel_crtc(m->private);
+ struct intel_crtc_state *crtc_state;
+ int ret;
+
+ 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, "Current: %u\n", crtc_state->pipe_bpp / 3);
+
+ drm_modeset_unlock(&crtc->base.mutex);
+
+ return ret;
+}
+DEFINE_SHOW_ATTRIBUTE(i915_current_bpc);
+
/**
* intel_connector_debugfs_add - add i915 specific connector debugfs files
* @connector: pointer to a registered drm_connector
@@ -2272,4 +2297,7 @@ void intel_crtc_debugfs_add(struct drm_crtc *crtc)
crtc_updates_add(crtc);
intel_fbc_crtc_debugfs_add(to_intel_crtc(crtc));
+
+ debugfs_create_file("i915_current_bpc", 0444, crtc->debugfs_entry, crtc,
+ &i915_current_bpc_fops);
}
--
2.38.1