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Date: Mon, 1 Sep 2008 12:45:48 +0100
From: Ben Hutchings <bhutchings@...arflare.com>
To: Jeff Garzik <jgarzik@...ox.com>
Cc: netdev@...r.kernel.org, linux-net-drivers@...arflare.com
Subject: [PATCH 06/52] 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 <bhutchings@...arflare.com>
---
drivers/net/sfc/sfe4001.c | 57 +++++++++++++++++++++++++++-----------------
1 files changed, 35 insertions(+), 22 deletions(-)
diff --git a/drivers/net/sfc/sfe4001.c b/drivers/net/sfc/sfe4001.c
index b278495..f927281 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;
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
--
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