tree: git://anongit.freedesktop.org/drm-intel topic/dp-hdmi-2.1-pcon head: 522508b665df3bbfdf40381d4e61777844b1703f commit: ced42f2df5fd8621c896faeafe7ecc0ea8b2ea81 [9/15] drm/i915: Add support for starting FRL training for HDMI2.1 via PCON compiler: gcc-9 (Debian 9.3.0-15) 9.3.0

If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot rong.a.chen@intel.com

cppcheck possible warnings: (new ones prefixed by >>, may not real problems)

...

drivers/gpu/drm/i915/display/intel_dp.c:4053:10: warning: Suspicious condition (assignment + comparison); Clarify expression with parentheses. [clarifyCondition]

wait_for(is_active = drm_dp_pcon_is_frl_ready(&intel_dp->aux) == true, TIMEOUT_FRL_READY_MS); ^ drivers/gpu/drm/i915/display/intel_dp.c:4072:10: warning: Suspicious condition (assignment + comparison); Clarify expression with parentheses. [clarifyCondition] wait_for(is_active = drm_dp_pcon_hdmi_link_active(&intel_dp->aux) == true, TIMEOUT_HDMI_LINK_ACTIVE_MS); ^

vim +4053 drivers/gpu/drm/i915/display/intel_dp.c

ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4028 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4029 struct drm_i915_private *i915 = dp_to_i915(intel_dp); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4030 int max_frl_bw, max_pcon_frl_bw, max_edid_frl_bw, ret; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4031 u8 max_frl_bw_mask = 0, frl_trained_mask; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4032 bool is_active; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4033 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4034 ret = drm_dp_pcon_reset_frl_config(&intel_dp->aux); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4035 if (ret < 0) ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4036 return ret; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4037 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4038 max_pcon_frl_bw = intel_dp->dfp.pcon_max_frl_bw; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4039 drm_dbg(&i915->drm, "PCON max rate = %d Gbps\n", max_pcon_frl_bw); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4040 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4041 max_edid_frl_bw = intel_dp_hdmi_sink_max_frl(intel_dp); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4042 drm_dbg(&i915->drm, "Sink max rate from EDID = %d Gbps\n", max_edid_frl_bw); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4043 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4044 max_frl_bw = min(max_edid_frl_bw, max_pcon_frl_bw); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4045 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4046 if (max_frl_bw <= 0) ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4047 return -EINVAL; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4048 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4049 ret = drm_dp_pcon_frl_prepare(&intel_dp->aux, false); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4050 if (ret < 0) ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4051 return ret; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4052 /* Wait for PCON to be FRL Ready */ ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 @4053 wait_for(is_active = drm_dp_pcon_is_frl_ready(&intel_dp->aux) == true, TIMEOUT_FRL_READY_MS); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4054 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4055 if (!is_active) ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4056 return -ETIMEDOUT; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4057 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4058 max_frl_bw_mask = intel_dp_pcon_set_frl_mask(max_frl_bw); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4059 ret = drm_dp_pcon_frl_configure_1(&intel_dp->aux, max_frl_bw, PCON_SEQUENTIAL_MODE); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4060 if (ret < 0) ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4061 return ret; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4062 ret = drm_dp_pcon_frl_configure_2(&intel_dp->aux, max_frl_bw_mask, PCON_NORMAL_TRAIN_MODE); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4063 if (ret < 0) ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4064 return ret; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4065 ret = drm_dp_pcon_frl_enable(&intel_dp->aux); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4066 if (ret < 0) ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4067 return ret; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4068 /* ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4069 * Wait for FRL to be completed ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4070 * Check if the HDMI Link is up and active. ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4071 */ ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4072 wait_for(is_active = drm_dp_pcon_hdmi_link_active(&intel_dp->aux) == true, TIMEOUT_HDMI_LINK_ACTIVE_MS); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4073 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4074 if (!is_active) ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4075 return -ETIMEDOUT; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4076 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4077 /* Verify HDMI Link configuration shows FRL Mode */ ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4078 if (drm_dp_pcon_hdmi_link_mode(&intel_dp->aux, &frl_trained_mask) != ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4079 DP_PCON_HDMI_MODE_FRL) { ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4080 drm_dbg(&i915->drm, "HDMI couldn't be trained in FRL Mode\n"); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4081 return -EINVAL; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4082 } ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4083 drm_dbg(&i915->drm, "MAX_FRL_MASK = %u, FRL_TRAINED_MASK = %u\n", max_frl_bw_mask, frl_trained_mask); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4084 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4085 intel_dp->frl.trained_rate_gbps = intel_dp_pcon_get_frl_mask(frl_trained_mask); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4086 intel_dp->frl.is_trained = true; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4087 drm_dbg(&i915->drm, "FRL trained with : %d Gbps\n", intel_dp->frl.trained_rate_gbps); ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4088 ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4089 return 0; ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4090 } ced42f2df5fd8621 Ankit Nautiyal 2020-12-18 4091

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