redonkable/alistair23-linux
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sfc: Reduce delays in SFE4001 initialisation

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Currently the board initialisation includes 2 delays of 1 second each.
Usually it is unnecessary to wait that long, so check before doing so.

Correct some of the comments and log messages while we're here.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Ben Hutchings 2008-09-01 12:45:48 +01:00 committed by Jeff Garzik
parent a0c2c19093
commit 11f34e691d
1 changed files with 34 additions and 21 deletions
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55
drivers/net/sfc/sfe4001.c
View file

@ -145,7 +145,7 @@ MODULE_PARM_DESC(phy_flash_cfg,
int sfe4001_init(struct efx_nic *efx)
{
struct i2c_client *hwmon_client, *ioexp_client;
unsigned int count;
unsigned int i, j;
int rc;
u8 out;
efx_dword_t reg;
@ -209,17 +209,24 @@ int sfe4001_init(struct efx_nic *efx)
if (rc)
goto fail_on;
/* Turn all power off then wait 1 sec. This ensures PHY is reset */
/* If PHY power is on, turn it all off and wait 1 second to
* ensure a full reset.
*/
rc = i2c_smbus_read_byte_data(ioexp_client, P0_OUT);
if (rc < 0)
goto fail_on;
out = 0xff & ~((0 << P0_EN_1V2_LBN) | (0 << P0_EN_2V5_LBN) |
(0 << P0_EN_3V3X_LBN) | (0 << P0_EN_5V_LBN) |
(0 << P0_EN_1V0X_LBN));
rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
if (rc)
goto fail_on;
if (rc != out) {
EFX_INFO(efx, "power-cycling PHY\n");
rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
if (rc)
goto fail_on;
schedule_timeout_uninterruptible(HZ);
}
schedule_timeout_uninterruptible(HZ);
count = 0;
do {
for (i = 0; i < 20; ++i) {
/* Turn on 1.2V, 2.5V, 3.3V and 5V power rails */
out = 0xff & ~((1 << P0_EN_1V2_LBN) | (1 << P0_EN_2V5_LBN) |
(1 << P0_EN_3V3X_LBN) | (1 << P0_EN_5V_LBN) |
@ -238,23 +245,29 @@ int sfe4001_init(struct efx_nic *efx)
if (rc)
goto fail_on;
EFX_INFO(efx, "waiting for power (attempt %d)...\n", count);
EFX_INFO(efx, "waiting for DSP boot (attempt %d)...\n", i);
schedule_timeout_uninterruptible(HZ);
/* Check DSP is powered */
rc = i2c_smbus_read_byte_data(ioexp_client, P1_IN);
if (rc < 0)
goto fail_on;
if (rc & (1 << P1_AFE_PWD_LBN))
/* In flash config mode, DSP does not turn on AFE, so
* just wait 1 second.
*/
if (sfe4001_phy_flash_cfg) {
schedule_timeout_uninterruptible(HZ);
goto done;
}
/* DSP doesn't look powered in flash config mode */
if (sfe4001_phy_flash_cfg)
goto done;
} while (++count < 20);
for (j = 0; j < 10; ++j) {
msleep(100);
EFX_INFO(efx, "timed out waiting for power\n");
/* Check DSP has asserted AFE power line */
rc = i2c_smbus_read_byte_data(ioexp_client, P1_IN);
if (rc < 0)
goto fail_on;
if (rc & (1 << P1_AFE_PWD_LBN))
goto done;
}
}
EFX_INFO(efx, "timed out waiting for DSP boot\n");
rc = -ETIMEDOUT;
goto fail_on;