Re: [PATCH v6 3/3] drm/i915/dp: Expose connector VRR monitor range via debugfs

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Hi Manasi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm-intel/for-linux-next]
[also build test ERROR on drm-tip/drm-tip drm-exynos/exynos-drm-next linus/master next-20200612]
[cannot apply to tegra-drm/drm/tegra/for-next drm/drm-next v5.7]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Manasi-Navare/VRR-capable-attach-prop-in-i915-DPCD-helper-VRR-debugfs/20200613-070517
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: x86_64-rhel (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce (this is a W=1 build):
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All error/warnings (new ones prefixed by >>, old ones prefixed by <<):

drivers/gpu/drm/i915/display/intel_display_debugfs.c: In function 'intel_connector_debugfs_add':
>> drivers/gpu/drm/i915/display/intel_display_debugfs.c:2235:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
2235 |  if (INTEL_GEN(dev_priv) >= 10 &&
|  ^~
drivers/gpu/drm/i915/display/intel_display_debugfs.c:2241:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
2241 |   if (INTEL_GEN(dev_priv) >= 12)
|   ^~
drivers/gpu/drm/i915/display/intel_display_debugfs.c: At top level:
>> drivers/gpu/drm/i915/display/intel_display_debugfs.c:2247:2: error: expected identifier or '(' before 'if'
2247 |  if ((INTEL_GEN(dev_priv) >= 9 || IS_HASWELL(dev_priv) ||
|  ^~
>> drivers/gpu/drm/i915/display/intel_display_debugfs.c:2257:2: error: expected identifier or '(' before 'return'
2257 |  return 0;
|  ^~~~~~
>> drivers/gpu/drm/i915/display/intel_display_debugfs.c:2258:1: error: expected identifier or '(' before '}' token
2258 | }
| ^
drivers/gpu/drm/i915/display/intel_display_debugfs.c: In function 'intel_connector_debugfs_add':
>> drivers/gpu/drm/i915/display/intel_display_debugfs.c:2244:2: warning: control reaches end of non-void function [-Wreturn-type]
2244 |  }
|  ^
In file included from include/drm/drm_debugfs.h:36,
from drivers/gpu/drm/i915/display/intel_display_debugfs.c:6:
At top level:
drivers/gpu/drm/i915/display/intel_display_debugfs.c:2081:23: warning: 'i915_lpsp_capability_fops' defined but not used [-Wunused-const-variable=]
2081 | DEFINE_SHOW_ATTRIBUTE(i915_lpsp_capability);
|                       ^~~~~~~~~~~~~~~~~~~~
include/linux/seq_file.h:154:37: note: in definition of macro 'DEFINE_SHOW_ATTRIBUTE'
154 | static const struct file_operations __name ## _fops = {            |                                     ^~~~~~

vim +2247 drivers/gpu/drm/i915/display/intel_display_debugfs.c

670af3cf7a3a36 Bhanuprakash Modem 2020-06-12  2202  
926b005cd8c4e3 Jani Nikula        2020-02-11  2203  /**
926b005cd8c4e3 Jani Nikula        2020-02-11  2204   * intel_connector_debugfs_add - add i915 specific connector debugfs files
926b005cd8c4e3 Jani Nikula        2020-02-11  2205   * @connector: pointer to a registered drm_connector
926b005cd8c4e3 Jani Nikula        2020-02-11  2206   *
926b005cd8c4e3 Jani Nikula        2020-02-11  2207   * Cleanup will be done by drm_connector_unregister() through a call to
926b005cd8c4e3 Jani Nikula        2020-02-11  2208   * drm_debugfs_connector_remove().
926b005cd8c4e3 Jani Nikula        2020-02-11  2209   *
926b005cd8c4e3 Jani Nikula        2020-02-11  2210   * Returns 0 on success, negative error codes on error.
926b005cd8c4e3 Jani Nikula        2020-02-11  2211   */
926b005cd8c4e3 Jani Nikula        2020-02-11  2212  int intel_connector_debugfs_add(struct drm_connector *connector)
926b005cd8c4e3 Jani Nikula        2020-02-11  2213  {
926b005cd8c4e3 Jani Nikula        2020-02-11  2214  	struct dentry *root = connector->debugfs_entry;
926b005cd8c4e3 Jani Nikula        2020-02-11  2215  	struct drm_i915_private *dev_priv = to_i915(connector->dev);
926b005cd8c4e3 Jani Nikula        2020-02-11  2216  
926b005cd8c4e3 Jani Nikula        2020-02-11  2217  	/* The connector must have been registered beforehands. */
926b005cd8c4e3 Jani Nikula        2020-02-11  2218  	if (!root)
926b005cd8c4e3 Jani Nikula        2020-02-11  2219  		return -ENODEV;
926b005cd8c4e3 Jani Nikula        2020-02-11  2220  
926b005cd8c4e3 Jani Nikula        2020-02-11  2221  	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
926b005cd8c4e3 Jani Nikula        2020-02-11  2222  		debugfs_create_file("i915_panel_timings", S_IRUGO, root,
926b005cd8c4e3 Jani Nikula        2020-02-11  2223  				    connector, &i915_panel_fops);
926b005cd8c4e3 Jani Nikula        2020-02-11  2224  		debugfs_create_file("i915_psr_sink_status", S_IRUGO, root,
926b005cd8c4e3 Jani Nikula        2020-02-11  2225  				    connector, &i915_psr_sink_status_fops);
926b005cd8c4e3 Jani Nikula        2020-02-11  2226  	}
926b005cd8c4e3 Jani Nikula        2020-02-11  2227  
926b005cd8c4e3 Jani Nikula        2020-02-11  2228  	if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
926b005cd8c4e3 Jani Nikula        2020-02-11  2229  	    connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
926b005cd8c4e3 Jani Nikula        2020-02-11  2230  	    connector->connector_type == DRM_MODE_CONNECTOR_HDMIB) {
926b005cd8c4e3 Jani Nikula        2020-02-11  2231  		debugfs_create_file("i915_hdcp_sink_capability", S_IRUGO, root,
926b005cd8c4e3 Jani Nikula        2020-02-11  2232  				    connector, &i915_hdcp_sink_capability_fops);
926b005cd8c4e3 Jani Nikula        2020-02-11  2233  	}
926b005cd8c4e3 Jani Nikula        2020-02-11  2234  
926b005cd8c4e3 Jani Nikula        2020-02-11 @2235  	if (INTEL_GEN(dev_priv) >= 10 &&
926b005cd8c4e3 Jani Nikula        2020-02-11  2236  	    (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
926b005cd8c4e3 Jani Nikula        2020-02-11  2237  	     connector->connector_type == DRM_MODE_CONNECTOR_eDP))
926b005cd8c4e3 Jani Nikula        2020-02-11  2238  		debugfs_create_file("i915_dsc_fec_support", S_IRUGO, root,
926b005cd8c4e3 Jani Nikula        2020-02-11  2239  				    connector, &i915_dsc_fec_support_fops);
926b005cd8c4e3 Jani Nikula        2020-02-11  2240  
670af3cf7a3a36 Bhanuprakash Modem 2020-06-12 @2241  		if (INTEL_GEN(dev_priv) >= 12)
670af3cf7a3a36 Bhanuprakash Modem 2020-06-12  2242  			debugfs_create_file("vrr_range", S_IRUGO,
670af3cf7a3a36 Bhanuprakash Modem 2020-06-12  2243  					    root, connector, &vrr_range_fops);
670af3cf7a3a36 Bhanuprakash Modem 2020-06-12 @2244  	}
670af3cf7a3a36 Bhanuprakash Modem 2020-06-12  2245  
8806211fe7b306 Anshuman Gupta     2020-04-15  2246  	/* Legacy panels doesn't lpsp on any platform */
8806211fe7b306 Anshuman Gupta     2020-04-15 @2247  	if ((INTEL_GEN(dev_priv) >= 9 || IS_HASWELL(dev_priv) ||
8806211fe7b306 Anshuman Gupta     2020-04-15  2248  	     IS_BROADWELL(dev_priv)) &&
8806211fe7b306 Anshuman Gupta     2020-04-15  2249  	     (connector->connector_type == DRM_MODE_CONNECTOR_DSI ||
8806211fe7b306 Anshuman Gupta     2020-04-15  2250  	     connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
8806211fe7b306 Anshuman Gupta     2020-04-15  2251  	     connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
8806211fe7b306 Anshuman Gupta     2020-04-15  2252  	     connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
8806211fe7b306 Anshuman Gupta     2020-04-15  2253  	     connector->connector_type == DRM_MODE_CONNECTOR_HDMIB))
8806211fe7b306 Anshuman Gupta     2020-04-15  2254  		debugfs_create_file("i915_lpsp_capability", 0444, root,
8806211fe7b306 Anshuman Gupta     2020-04-15  2255  				    connector, &i915_lpsp_capability_fops);
8806211fe7b306 Anshuman Gupta     2020-04-15  2256  
926b005cd8c4e3 Jani Nikula        2020-02-11 @2257  	return 0;
926b005cd8c4e3 Jani Nikula        2020-02-11 @2258  }

:::::: The code at line 2247 was first introduced by commit
:::::: 8806211fe7b30696c1fcae54b73c94abfdf55893 drm/i915: Add i915_lpsp_capability debugfs

:::::: TO: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
:::::: CC: Uma Shankar <uma.shankar@xxxxxxxxx>

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