diff options
Diffstat (limited to 'drivers/staging/rdma/hfi1/qsfp.c')
| -rw-r--r-- | drivers/staging/rdma/hfi1/qsfp.c | 38 |
1 files changed, 35 insertions, 3 deletions
diff --git a/drivers/staging/rdma/hfi1/qsfp.c b/drivers/staging/rdma/hfi1/qsfp.c index ac03d80d27cc..dc5d1864dcd4 100644 --- a/drivers/staging/rdma/hfi1/qsfp.c +++ b/drivers/staging/rdma/hfi1/qsfp.c @@ -466,7 +466,28 @@ const char * const hfi1_qsfp_devtech[16] = { #define QSFP_DUMP_CHUNK 16 /* Holds longest string */ #define QSFP_DEFAULT_HDR_CNT 224 -static const char *pwr_codes = "1.5W2.0W2.5W3.5W"; +#define QSFP_PWR(pbyte) (((pbyte) >> 6) & 3) +#define QSFP_HIGH_PWR(pbyte) ((pbyte) & 3) +/* For use with QSFP_HIGH_PWR macro */ +#define QSFP_HIGH_PWR_UNUSED 0 /* Bits [1:0] = 00 implies low power module */ + +/* + * Takes power class byte [Page 00 Byte 129] in SFF 8636 + * Returns power class as integer (1 through 7, per SFF 8636 rev 2.4) + */ +int get_qsfp_power_class(u8 power_byte) +{ + if (QSFP_HIGH_PWR(power_byte) == QSFP_HIGH_PWR_UNUSED) + /* power classes count from 1, their bit encodings from 0 */ + return (QSFP_PWR(power_byte) + 1); + /* + * 00 in the high power classes stands for unused, bringing + * balance to the off-by-1 offset above, we add 4 here to + * account for the difference between the low and high power + * groups + */ + return (QSFP_HIGH_PWR(power_byte) + 4); +} int qsfp_mod_present(struct hfi1_pportdata *ppd) { @@ -537,6 +558,16 @@ set_zeroes: return ret; } +static const char *pwr_codes[8] = {"N/AW", + "1.5W", + "2.0W", + "2.5W", + "3.5W", + "4.0W", + "4.5W", + "5.0W" + }; + int qsfp_dump(struct hfi1_pportdata *ppd, char *buf, int len) { u8 *cache = &ppd->qsfp_info.cache[0]; @@ -546,6 +577,7 @@ int qsfp_dump(struct hfi1_pportdata *ppd, char *buf, int len) int bidx = 0; u8 *atten = &cache[QSFP_ATTEN_OFFS]; u8 *vendor_oui = &cache[QSFP_VOUI_OFFS]; + u8 power_byte = 0; sofar = 0; lenstr[0] = ' '; @@ -555,9 +587,9 @@ int qsfp_dump(struct hfi1_pportdata *ppd, char *buf, int len) if (QSFP_IS_CU(cache[QSFP_MOD_TECH_OFFS])) sprintf(lenstr, "%dM ", cache[QSFP_MOD_LEN_OFFS]); + power_byte = cache[QSFP_MOD_PWR_OFFS]; sofar += scnprintf(buf + sofar, len - sofar, "PWR:%.3sW\n", - pwr_codes + - (QSFP_PWR(cache[QSFP_MOD_PWR_OFFS]) * 4)); + pwr_codes[get_qsfp_power_class(power_byte)]); sofar += scnprintf(buf + sofar, len - sofar, "TECH:%s%s\n", lenstr, |