From 11f34e691d6b3501606a9eaf5379ec718d2fabeb Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Mon, 1 Sep 2008 12:45:48 +0100 Subject: [PATCH 1/1] sfc: Reduce delays in SFE4001 initialisation 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 Signed-off-by: Jeff Garzik --- drivers/net/sfc/sfe4001.c | 57 ++++++++++++++++++++++++--------------- 1 file changed, 35 insertions(+), 22 deletions(-) diff --git a/drivers/net/sfc/sfe4001.c b/drivers/net/sfc/sfe4001.c index b2784952399..f9272816437 100644 --- a/drivers/net/sfc/sfe4001.c +++ b/drivers/net/sfc/sfe4001.c @@ -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); - - 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)) - goto done; + EFX_INFO(efx, "waiting for DSP boot (attempt %d)...\n", i); - /* DSP doesn't look powered in flash config mode */ - if (sfe4001_phy_flash_cfg) + /* 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; - } while (++count < 20); + } + + for (j = 0; j < 10; ++j) { + msleep(100); + + /* 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 power\n"); + EFX_INFO(efx, "timed out waiting for DSP boot\n"); rc = -ETIMEDOUT; goto fail_on; -- 2.41.1