Patchwork [2/7] sfc: Do not reinitialise XAUI serdes before it has completed reset

login
register
mail settings
Submitter Ben Hutchings
Date Aug. 26, 2009, 6:16 p.m.
Message ID <1251310606.27345.11.camel@achroite>
Download mbox | patch
Permalink /patch/32194/
State Accepted
Delegated to: David Miller
Headers show

Comments

Ben Hutchings - Aug. 26, 2009, 6:16 p.m.
falcon_reset_xaui() waits for XGXS reset to complete, but the XAUI
serdes reset may take longer.  It needs to check both reset active
bits.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
---
 drivers/net/sfc/falcon_hwdefs.h |    2 ++
 drivers/net/sfc/falcon_xmac.c   |    8 +++++---
 2 files changed, 7 insertions(+), 3 deletions(-)
David Miller - Aug. 27, 2009, 1:04 a.m.
From: Ben Hutchings <bhutchings@solarflare.com>
Date: Wed, 26 Aug 2009 19:16:46 +0100

> falcon_reset_xaui() waits for XGXS reset to complete, but the XAUI
> serdes reset may take longer.  It needs to check both reset active
> bits.
> 
> Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

Applied.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Patch

diff --git a/drivers/net/sfc/falcon_hwdefs.h b/drivers/net/sfc/falcon_hwdefs.h
index 375e2a5..2d22611 100644
--- a/drivers/net/sfc/falcon_hwdefs.h
+++ b/drivers/net/sfc/falcon_hwdefs.h
@@ -700,6 +700,8 @@ 
 /* XGXS/XAUI powerdown/reset register */
 #define XX_PWR_RST_REG 0x1300
 
+#define XX_SD_RST_ACT_LBN 16
+#define XX_SD_RST_ACT_WIDTH 1
 #define XX_PWRDND_EN_LBN 15
 #define XX_PWRDND_EN_WIDTH 1
 #define XX_PWRDNC_EN_LBN 14
diff --git a/drivers/net/sfc/falcon_xmac.c b/drivers/net/sfc/falcon_xmac.c
index 2b3269c..bec52ca 100644
--- a/drivers/net/sfc/falcon_xmac.c
+++ b/drivers/net/sfc/falcon_xmac.c
@@ -64,13 +64,15 @@  int falcon_reset_xaui(struct efx_nic *efx)
 	efx_oword_t reg;
 	int count;
 
+	/* Start reset sequence */
 	EFX_POPULATE_DWORD_1(reg, XX_RST_XX_EN, 1);
 	falcon_write(efx, &reg, XX_PWR_RST_REG);
 
-	/* Give some time for the link to establish */
-	for (count = 0; count < 1000; count++) { /* wait upto 10ms */
+	/* Wait up to 10 ms for completion, then reinitialise */
+	for (count = 0; count < 1000; count++) {
 		falcon_read(efx, &reg, XX_PWR_RST_REG);
-		if (EFX_OWORD_FIELD(reg, XX_RST_XX_EN) == 0) {
+		if (EFX_OWORD_FIELD(reg, XX_RST_XX_EN) == 0 &&
+		    EFX_OWORD_FIELD(reg, XX_SD_RST_ACT) == 0) {
 			falcon_setup_xaui(efx);
 			return 0;
 		}