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libpayload: ahci: Fix command engine shutdown 

A timeout while waiting for a device' signature has shown that our
error path wasn't correct. The shutdown of the ports command engine
always timed out. Fix that by waiting for FR (FIS Receive Running)
to be cleared independently from CR (Command List Running) and after
clearing FRE (FIS Receive Enable).

Change-Id: I50edf426ef0241424456f1489a7fc86a2cfc5753
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/3494
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Nico Huber 2013-06-17 17:47:24 +02:00 committed by Stefan Reinauer
parent 3cc151ede0
commit a00f9830fb
1 changed files with 14 additions and 3 deletions
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17
payloads/libpayload/drivers/storage/ahci.c
View File

@ -73,7 +73,7 @@ static inline int ahci_port_is_active(const hba_port_t *const port)
static int ahci_cmdengine_start(hba_port_t *const port)
{
/* Wait for the controller to clear CR.
/* CR has to be clear before starting the command engine.
This shouldn't take too long, but we should time out nevertheless. */
int timeout = 1000; /* Time out after 1000 * 1us == 1ms. */
while ((port->cmd_stat & HBA_PxCMD_CR) && timeout--)
@ -92,10 +92,10 @@ static int ahci_cmdengine_stop(hba_port_t *const port)
{
port->cmd_stat &= ~HBA_PxCMD_ST;
/* Wait for the controller to clear FR and CR.
/* Wait for the controller to clear CR.
This shouldn't take too long, but we should time out nevertheless. */
int timeout = 1000; /* Time out after 1000 * 1us == 1ms. */
while ((port->cmd_stat & (HBA_PxCMD_FR | HBA_PxCMD_CR)) && timeout--)
while ((port->cmd_stat & HBA_PxCMD_CR) && timeout--)
udelay(1);
if (timeout < 0) {
printf("ahci: Timeout during stopping of command engine.\n");
@ -103,6 +103,17 @@ static int ahci_cmdengine_stop(hba_port_t *const port)
}
port->cmd_stat &= ~HBA_PxCMD_FRE;
/* Wait for the controller to clear FR.
This shouldn't take too long, but we should time out nevertheless. */
timeout = 1000; /* Time out after 1000 * 1us == 1ms. */
while ((port->cmd_stat & HBA_PxCMD_FR) && timeout--)
udelay(1);
if (timeout < 0) {
printf("ahci: Timeout during stopping of command engine.\n");
return 1;
}
return 0;
}