From 41752663b410c6265e24ff0570350b0b05ecdafe Mon Sep 17 00:00:00 2001 From: Bhanuprakash Modem Date: Mon, 22 Jun 2020 19:55:18 +0530 Subject: [PATCH] drm/debug: Expose connector VRR monitor range via debugfs MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit [Why] It's useful to know the min and max vrr range for IGT testing. [How] Expose the min and max vfreq for the connector via a debugfs file on the connector, "vrr_range". Example usage: cat /sys/kernel/debug/dri/0/DP-1/vrr_range v2: * Fix the typo in max_vfreq (Manasi) * Change the name of node to i915_vrr_info so we can add other vrr info for more debug info (Manasi) * Change the VRR capable to display Yes or No (Manasi) * Fix indentation checkpatch errors (Manasi) v3: * Remove the unnecessary debug print (Manasi) v4: * Rebase v5: * Rename to vrr_range to match AMD debugfs v6: * Rebase (manasi) v7: * Fix cmpilation due to rebase v8: * Move debugfs node creation logic to DRM (Emil) * Remove AMD specific logic (Emil) v9: * Separate patch for removal of AMD specific logic (Manasi) Signed-off-by: Bhanuprakash Modem Signed-off-by: Manasi Navare Cc: Jani Nikula Cc: Ville Syrjälä Cc: Harry Wentland CC: Emil Velikov Reviewed-by: Manasi Navare Signed-off-by: Manasi Navare Link: https://patchwork.freedesktop.org/patch/msgid/20200622142519.16214-3-bhanuprakash.modem@intel.com --- drivers/gpu/drm/drm_debugfs.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c index bfe4602..3d71820 100644 --- a/drivers/gpu/drm/drm_debugfs.c +++ b/drivers/gpu/drm/drm_debugfs.c @@ -376,6 +376,24 @@ static ssize_t edid_write(struct file *file, const char __user *ubuf, return (ret) ? ret : len; } +/* + * Returns the min and max vrr vfreq through the connector's debugfs file. + * Example usage: cat /sys/kernel/debug/dri/0/DP-1/vrr_range + */ +static int vrr_range_show(struct seq_file *m, void *data) +{ + struct drm_connector *connector = m->private; + + if (connector->status != connector_status_connected) + return -ENODEV; + + seq_printf(m, "Min: %u\n", (u8)connector->display_info.monitor_range.min_vfreq); + seq_printf(m, "Max: %u\n", (u8)connector->display_info.monitor_range.max_vfreq); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(vrr_range); + static const struct file_operations drm_edid_fops = { .owner = THIS_MODULE, .open = edid_open, @@ -413,6 +431,10 @@ void drm_debugfs_connector_add(struct drm_connector *connector) /* edid */ debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root, connector, &drm_edid_fops); + + /* vrr range */ + debugfs_create_file("vrr_range", S_IRUGO, root, connector, + &vrr_range_fops); } void drm_debugfs_connector_remove(struct drm_connector *connector) -- 2.7.4