From: Michael Schmitz <schmitz...@gmail.com> Date: Mon, 14 Apr 2014 10:38:09 +1200
> That appears to be our problem if I recall correctly Tuomas' debugging > report. (reselection, not selection as initiator). As > esp_slave_configure() enables queue tags regardless of chip config, > we'd best make certain the chip is configured correctly. > > The SCSI2 bit is used to test for presence of config register 2 in > esp_get_revision but later cleared in the same function. It appears > we'd need to set it after the call to scsi_esp_register() - can you > test whether that obsoletes the zorro_esp_slave_configure hack, > Tuomas? ... >> Group 2 Commands >> (seems to only be relevant for target mode). >> >> And about the QTE bit: >> >> Bit 6 Queue Tag Enable >> >> When this bit is set, the 53CF94/96 can receive 3-byte messages during >> bus-initiated Select With ATN. This feature is also enabled by setting >> bit 3 in the Configuration 2 register. > > My preference would be to set this one (named ESP_CONFIG3_TBMS). Your > opinion, Dave? As seems to be agreed upon here, the SCSI2 bit in the CONFIG2 register (ESP_CONFIG2_SCSI2ENAB) is only for when the chip is used in target mode. So it is not relevant for our discussion because this driver is for initiator mode operation only. But some pieces of documentation seem like they might not agree on this point. With respect to bit 3 in the config3 register, it can take on one of two meaning depending upon chip revision. As per ESP_CONFIG3_{TMS,FCLK} it either controls fast SCSI clocking, or it enabled 3 byte message recognition. But oddly in the NCR53CX docs: http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR53C9X.txt it speaks as if ESP_CONFIG3_TMS and ESP_CONFIG3_TENB are merely finer grained versions of config2 register setting ESP_CONFIG2_SCSI2ENAB, which enables both features. Again I looked at the FreeBSD driver and for all chips after plain esp100, they set ESP_CONFIG2_SCSI2ENAB. Can we try testing the following patch? ==================== esp_scsi: Set SCSI2 bit in config2 register. This should allow proper recognition of 3 byte reselection on all esp100a and later chips. Reported-by: Kars de Jong <jo...@linux-m68k.org> Reported-by: Michael Schmitz <schmitz...@gmail.com> Signed-off-by: David S. Miller <da...@davemloft.net> diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c index 55548dc..16f69e0 100644 --- a/drivers/scsi/esp_scsi.c +++ b/drivers/scsi/esp_scsi.c @@ -2160,7 +2160,7 @@ static void esp_get_revision(struct esp *esp) */ esp->rev = ESP100; } else { - esp->config2 = 0; + esp->config2 = ESP_CONFIG2_SCSI2ENAB; esp_set_all_config3(esp, 5); esp->prev_cfg3 = 5; esp_write8(esp->config2, ESP_CFG2); @@ -2187,8 +2187,6 @@ static void esp_get_revision(struct esp *esp) } else { esp->rev = ESP236; } - esp->config2 = 0; - esp_write8(esp->config2, ESP_CFG2); } } } -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html