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[SCSI] esp: Correct chip ID probing sequence. 

The features enable bit has to be set in the config2 register
before we can be absolutely sure we will probe a correct
part unique ID and family code from the transfer-count-high
register.

Also, reload the CFACT, STP, SOFF, and TIMEO near the end of
esp_reset_esp().

From a patch by Maciej W. Rozycki.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
David S. Miller 2007-09-30 17:10:42 -07:00 committed by James Bottomley
parent eac6e8e449
commit a793804f25
1 changed files with 13 additions and 11 deletions
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24
drivers/scsi/esp_scsi.c
View File

@ -219,19 +219,10 @@ static void esp_reset_esp(struct esp *esp)
/* Now reset the ESP chip */
scsi_esp_cmd(esp, ESP_CMD_RC);
scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
if (esp->rev == FAST)
esp_write8(ESP_CONFIG2_FENAB, ESP_CFG2);
scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
/* Reload the configuration registers */
esp_write8(esp->cfact, ESP_CFACT);
esp->prev_stp = 0;
esp_write8(esp->prev_stp, ESP_STP);
esp->prev_soff = 0;
esp_write8(esp->prev_soff, ESP_SOFF);
esp_write8(esp->neg_defp, ESP_TIMEO);
/* This is the only point at which it is reliable to read
* the ID-code for a fast ESP chip variants.
*/
@ -316,6 +307,17 @@ static void esp_reset_esp(struct esp *esp)
break;
}
/* Reload the configuration registers */
esp_write8(esp->cfact, ESP_CFACT);
esp->prev_stp = 0;
esp_write8(esp->prev_stp, ESP_STP);
esp->prev_soff = 0;
esp_write8(esp->prev_soff, ESP_SOFF);
esp_write8(esp->neg_defp, ESP_TIMEO);
/* Eat any bitrot in the chip */
esp_read8(ESP_INTRPT);
udelay(100);