3.16.51-rc1 review patch. If anyone has any objections, please let me know.
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From: Finn Thain fthain@telegraphics.com.au
commit 7640d91d285893a5cf1e62b2cd00f0884c401d93 upstream.
When in MESSAGE IN phase, the ESP device does not automatically acknowledge each byte that is transferred by PIO. The mac_esp driver neglects to explicitly ack them, which causes a timeout during messages larger than one byte (e.g. tag bytes during reconnect). Fix this with an ESP_CMD_MOK command after each byte.
The MESSAGE IN phase is also different in that each byte transferred raises ESP_INTR_FDONE. So don't exit the transfer loop for this interrupt, for this phase.
That resolves the "Reconnect IRQ2 timeout" error on those Macs which use PIO transfers instead of PDMA. This patch also improves on the weak tests for unexpected interrupts and phase changes during PIO transfers.
Tested-by: Stan Johnson userm57@yahoo.com Fixes: 02507a80b35e ("[PATCH] [SCSI] mac_esp: fix PIO mode, take 2") Signed-off-by: Finn Thain fthain@telegraphics.com.au Signed-off-by: Martin K. Petersen martin.petersen@oracle.com [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/scsi/mac_esp.c | 35 ++++++++++++++++++----------------- 1 file changed, 18 insertions(+), 17 deletions(-)
--- a/drivers/scsi/mac_esp.c +++ b/drivers/scsi/mac_esp.c @@ -348,25 +348,23 @@ static void mac_esp_send_pio_cmd(struct { struct mac_esp_priv *mep = MAC_ESP_GET_PRIV(esp); u8 *fifo = esp->regs + ESP_FDATA * 16; + u8 phase = esp->sreg & ESP_STAT_PMASK;
cmd &= ~ESP_CMD_DMA; mep->error = 0;
if (write) { + u8 *dst = (u8 *)addr; + u8 mask = ~(phase == ESP_MIP ? ESP_INTR_FDONE : ESP_INTR_BSERV); + scsi_esp_cmd(esp, cmd);
while (1) { - unsigned int n; - - n = mac_esp_wait_for_fifo(esp); - if (!n) + if (!mac_esp_wait_for_fifo(esp)) break;
- if (n > esp_count) - n = esp_count; - esp_count -= n; - - MAC_ESP_PIO_LOOP("%2@,%0@+", n); + *dst++ = esp_read8(ESP_FDATA); + --esp_count;
if (!esp_count) break; @@ -374,14 +372,17 @@ static void mac_esp_send_pio_cmd(struct if (mac_esp_wait_for_intr(esp)) break;
- if (((esp->sreg & ESP_STAT_PMASK) != ESP_DIP) && - ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP)) + if ((esp->sreg & ESP_STAT_PMASK) != phase) break;
esp->ireg = esp_read8(ESP_INTRPT); - if ((esp->ireg & (ESP_INTR_DC | ESP_INTR_BSERV)) != - ESP_INTR_BSERV) + if (esp->ireg & mask) { + mep->error = 1; break; + } + + if (phase == ESP_MIP) + scsi_esp_cmd(esp, ESP_CMD_MOK);
scsi_esp_cmd(esp, ESP_CMD_TI); } @@ -401,14 +402,14 @@ static void mac_esp_send_pio_cmd(struct if (mac_esp_wait_for_intr(esp)) break;
- if (((esp->sreg & ESP_STAT_PMASK) != ESP_DOP) && - ((esp->sreg & ESP_STAT_PMASK) != ESP_MOP)) + if ((esp->sreg & ESP_STAT_PMASK) != phase) break;
esp->ireg = esp_read8(ESP_INTRPT); - if ((esp->ireg & (ESP_INTR_DC | ESP_INTR_BSERV)) != - ESP_INTR_BSERV) + if (esp->ireg & ~ESP_INTR_BSERV) { + mep->error = 1; break; + }
n = MAC_ESP_FIFO_SIZE - (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES);