From e87491a9fd4e33eaf18ef69d8295bb07b31452b2 Mon Sep 17 00:00:00 2001 From: Mario Limonciello Date: Thu, 3 Mar 2022 07:13:24 -0600 Subject: thunderbolt: Retry DROM reads for more failure scenarios Currently DROM reads are only retried in the case that parsing failed. However if the size or CRC fails, then there should also be a retry. This helps with reading the DROM on TBT3 devices connected to AMD Yellow Carp which will sometimes fail on the first attempt. Signed-off-by: Mario Limonciello Signed-off-by: Mika Westerberg --- drivers/thunderbolt/eeprom.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) (limited to 'drivers/thunderbolt') diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c index 470885e6f1c8..10cdbcb55df9 100644 --- a/drivers/thunderbolt/eeprom.c +++ b/drivers/thunderbolt/eeprom.c @@ -553,9 +553,9 @@ static int tb_drom_parse(struct tb_switch *sw) crc = tb_crc8((u8 *) &header->uid, 8); if (crc != header->uid_crc8) { tb_sw_warn(sw, - "DROM UID CRC8 mismatch (expected: %#x, got: %#x), aborting\n", + "DROM UID CRC8 mismatch (expected: %#x, got: %#x)\n", header->uid_crc8, crc); - return -EINVAL; + return -EILSEQ; } if (!sw->uid) sw->uid = header->uid; @@ -654,6 +654,7 @@ int tb_drom_read(struct tb_switch *sw) sw->drom = kzalloc(size, GFP_KERNEL); if (!sw->drom) return -ENOMEM; +read: res = tb_drom_read_n(sw, 0, sw->drom, size); if (res) goto err; @@ -662,7 +663,11 @@ parse: header = (void *) sw->drom; if (header->data_len + TB_DROM_DATA_START != size) { - tb_sw_warn(sw, "drom size mismatch, aborting\n"); + tb_sw_warn(sw, "drom size mismatch\n"); + if (retries--) { + msleep(100); + goto read; + } goto err; } @@ -683,11 +688,9 @@ parse: /* If the DROM parsing fails, wait a moment and retry once */ if (res == -EILSEQ && retries--) { - tb_sw_warn(sw, "parsing DROM failed, retrying\n"); + tb_sw_warn(sw, "parsing DROM failed\n"); msleep(100); - res = tb_drom_read_n(sw, 0, sw->drom, size); - if (!res) - goto parse; + goto read; } if (!res) -- cgit v1.2.3