Hi Matt, Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on v4.16-rc4] [also build test WARNING on next-20180316] [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/matthew-s-atwood-intel-com/drm-dp-Correctly-mask-DP_TRAINING_AUX_RD_INTERVAL-values-for-DP-1-4/20180316-185136 config: i386-randconfig-x003-201810 (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=i386 All warnings (new ones prefixed by >>): In file included from include/linux/kernel.h:10:0, from drivers/gpu/drm/drm_dp_helper.c:23: drivers/gpu/drm/drm_dp_helper.c: In function 'drm_dp_link_train_clock_recovery_delay': drivers/gpu/drm/drm_dp_helper.c:127:48: error: 'DP_REV_14' undeclared (first use in this function); did you mean 'DPCD_REV_14'? if (rd_interval == 0 || (dpcd[DP_DPCD_REV] >= DP_REV_14)) ^ include/linux/compiler.h:58:30: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^~~~ >> drivers/gpu/drm/drm_dp_helper.c:127:2: note: in expansion of macro 'if' if (rd_interval == 0 || (dpcd[DP_DPCD_REV] >= DP_REV_14)) ^~ drivers/gpu/drm/drm_dp_helper.c:127:48: note: each undeclared identifier is reported only once for each function it appears in if (rd_interval == 0 || (dpcd[DP_DPCD_REV] >= DP_REV_14)) ^ include/linux/compiler.h:58:30: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^~~~ >> drivers/gpu/drm/drm_dp_helper.c:127:2: note: in expansion of macro 'if' if (rd_interval == 0 || (dpcd[DP_DPCD_REV] >= DP_REV_14)) ^~ vim +/if +127 drivers/gpu/drm/drm_dp_helper.c > 23 #include <linux/kernel.h> 24 #include <linux/module.h> 25 #include <linux/delay.h> 26 #include <linux/init.h> 27 #include <linux/errno.h> 28 #include <linux/sched.h> 29 #include <linux/i2c.h> 30 #include <linux/seq_file.h> 31 #include <drm/drm_dp_helper.h> 32 #include <drm/drmP.h> 33 34 #include "drm_crtc_helper_internal.h" 35 36 /** 37 * DOC: dp helpers 38 * 39 * These functions contain some common logic and helpers at various abstraction 40 * levels to deal with Display Port sink devices and related things like DP aux 41 * channel transfers, EDID reading over DP aux channels, decoding certain DPCD 42 * blocks, ... 43 */ 44 45 /* Helpers for DP link training */ 46 static u8 dp_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r) 47 { 48 return link_status[r - DP_LANE0_1_STATUS]; 49 } 50 51 static u8 dp_get_lane_status(const u8 link_status[DP_LINK_STATUS_SIZE], 52 int lane) 53 { 54 int i = DP_LANE0_1_STATUS + (lane >> 1); 55 int s = (lane & 1) * 4; 56 u8 l = dp_link_status(link_status, i); 57 return (l >> s) & 0xf; 58 } 59 60 bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE], 61 int lane_count) 62 { 63 u8 lane_align; 64 u8 lane_status; 65 int lane; 66 67 lane_align = dp_link_status(link_status, 68 DP_LANE_ALIGN_STATUS_UPDATED); 69 if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0) 70 return false; 71 for (lane = 0; lane < lane_count; lane++) { 72 lane_status = dp_get_lane_status(link_status, lane); 73 if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS) 74 return false; 75 } 76 return true; 77 } 78 EXPORT_SYMBOL(drm_dp_channel_eq_ok); 79 80 bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE], 81 int lane_count) 82 { 83 int lane; 84 u8 lane_status; 85 86 for (lane = 0; lane < lane_count; lane++) { 87 lane_status = dp_get_lane_status(link_status, lane); 88 if ((lane_status & DP_LANE_CR_DONE) == 0) 89 return false; 90 } 91 return true; 92 } 93 EXPORT_SYMBOL(drm_dp_clock_recovery_ok); 94 95 u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE], 96 int lane) 97 { 98 int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1); 99 int s = ((lane & 1) ? 100 DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT : 101 DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT); 102 u8 l = dp_link_status(link_status, i); 103 104 return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT; 105 } 106 EXPORT_SYMBOL(drm_dp_get_adjust_request_voltage); 107 108 u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SIZE], 109 int lane) 110 { 111 int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1); 112 int s = ((lane & 1) ? 113 DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT : 114 DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT); 115 u8 l = dp_link_status(link_status, i); 116 117 return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT; 118 } 119 EXPORT_SYMBOL(drm_dp_get_adjust_request_pre_emphasis); 120 121 void drm_dp_link_train_clock_recovery_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { 122 int rd_interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] & DP_TRAINING_AUX_RD_MASK; 123 124 if (rd_interval > 4) 125 DRM_DEBUG_KMS("AUX interval %d, out of range (max 4)\n", rd_interval); 126 > 127 if (rd_interval == 0 || (dpcd[DP_DPCD_REV] >= DP_REV_14)) 128 udelay(100); 129 else 130 mdelay(rd_interval * 4); 131 } 132 EXPORT_SYMBOL(drm_dp_link_train_clock_recovery_delay); 133 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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