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sfc: Do not reinitialise XAUI serdes before it has completed reset

PATCH Applied Ben Hutchings 2 participants 2 messages Aug 26, 2009 – Aug 27, 2009

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Ben Hutchings

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PATCH 2/7 sfc: Do not reinitialise XAUI serdes before it has completed reset

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 <[email protected]>
---
 drivers/net/sfc/falcon_hwdefs.h |    2 ++
 drivers/net/sfc/falcon_xmac.c   |    8 +++++---
 2 files changed, 7 insertions(+), 3 deletions(-)
drivers/net/sfc/falcon_hwdefs.h +2 -0
index 375e2a5..2d22611 100644
@@ -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
drivers/net/sfc/falcon_xmac.c +5 -3
index 2b3269c..bec52ca 100644
@@ -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;
 		}
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Ben Hutchings, Senior Software Engineer, Solarflare Communications
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