[Intel-gfx] [PATCH] drm/i915/dp: On link train failure on eDP, retry with max params first

[kbuild test robot]

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 v5.1-rc3 next-20190403]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Manasi-Navare/drm-i915-dp-On-link-train-failure-on-eDP-retry-with-max-params-first/20190404-115622
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: x86_64-randconfig-x013-201913 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

   drivers/gpu//drm/i915/intel_dp.c: In function 'intel_dp_uses_max_link_params':
>> drivers/gpu//drm/i915/intel_dp.c:466:50: error: parameter name omitted
    static bool intel_dp_uses_max_link_params(struct intel_dp*,
                                                     ^~~~~~~~
>> drivers/gpu//drm/i915/intel_dp.c:470:22: error: 'intel_dp' undeclared (first use in this function)
     return link_rate == intel_dp->max_link_rate &&
                         ^~~~~~~~
   drivers/gpu//drm/i915/intel_dp.c:470:22: note: each undeclared identifier is reported only once for each function it appears in
   drivers/gpu//drm/i915/intel_dp.c: In function 'intel_dp_get_link_train_fallback_values':
>> drivers/gpu//drm/i915/intel_dp.c:484:7: warning: the address of 'intel_dp_uses_max_link_params' will always evaluate as 'true' [-Waddress]
      if (!intel_dp_uses_max_link_params) {
          ^
>> drivers/gpu//drm/i915/intel_dp.c:486:4: error: implicit declaration of function 'DRM_DEBUGS_KMS'; did you mean 'DRM_DEBUG_KMS'? [-Werror=implicit-function-declaration]
       DRM_DEBUGS_KMS("Retrying Link training for eDP with max link parameters\n");
       ^~~~~~~~~~~~~~
       DRM_DEBUG_KMS
   cc1: some warnings being treated as errors

vim +/intel_dp +470 drivers/gpu//drm/i915/intel_dp.c

   465	
 > 466	static bool intel_dp_uses_max_link_params(struct intel_dp*,
   467						  int link_rate,
   468						  u8 lane_count)
   469	{
 > 470		return link_rate == intel_dp->max_link_rate &&
   471			lane_count == intel_dp->max_link_lane_count;
   472	}
   473	
   474	int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp,
   475						    int link_rate, u8 lane_count)
   476	{
   477		int index;
   478	
   479		index = intel_dp_rate_index(intel_dp->common_rates,
   480					    intel_dp->num_common_rates,
   481					    link_rate);
   482	
   483		if (intel_dp_is_edp(intel_dp)) {
 > 484			if (!intel_dp_uses_max_link_params) {
   485				intel_dp->retry_with_max_link_params = true;
 > 486				DRM_DEBUGS_KMS("Retrying Link training for eDP with max link parameters\n");
   487				return 0;
   488			} else if (!intel_dp_can_link_train_fallback_for_edp(intel_dp,
   489									     intel_dp->common_rates[index - 1],
   490									     lane_count)) {
   491				DRM_DEBUG_KMS("Retrying Link training for eDP with same parameters\n");
   492				return 0;
   493			}
   494		}
   495		if (index > 0) {
   496			intel_dp->max_link_rate = intel_dp->common_rates[index - 1];
   497			intel_dp->max_link_lane_count = lane_count;
   498		} else if (lane_count > 1) {
   499			intel_dp->max_link_rate = intel_dp_max_common_rate(intel_dp);
   500			intel_dp->max_link_lane_count = lane_count >> 1;
   501		} else {
   502			DRM_ERROR("Link Training Unsuccessful\n");
   503			return -1;
   504		}
   505	
   506		return 0;
   507	}
   508	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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