[PATCH] net: macb: do not disable MDIO bus at open/close time

[Anssi Hannula <anssi.hannula@bitwise.fi>]

macb_reset_hw() is called from macb_close() and indirectly from
macb_open(). macb_reset_hw() zeroes the NCR register, including the MPE
(Management Port Enable) bit.

This will prevent accessing any other PHYs for other Ethernet MACs on
the MDIO bus, which remains registered at macb_reset_hw() time, until
macb_init_hw() is called from macb_open() which sets the MPE bit again.

I.e. currently the MDIO bus has a short disruption at open time and is
disabled at close time until the interface is opened again.

Fix that by only touching the RE and TE bits when enabling and disabling
RX/TX.

Fixes: 6c36a7074436 ("macb: Use generic PHY layer")
Signed-off-by: Anssi Hannula <anssi.hannula@bitwise.fi>
---

Claudiu Beznea wrote:
> On 10.08.2018 09:22, Anssi Hannula wrote:
>>
>> macb_reset_hw() is called in init path too,
>
> I only see it in macb_close() and macb_open() called from macb_init_hw().

Yeah, macb_init_hw() is what I meant :)


 drivers/net/ethernet/cadence/macb_main.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index dc09f9a8a49b..6501e9b3785a 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -2028,14 +2028,17 @@ static void macb_reset_hw(struct macb *bp)
 {
 	struct macb_queue *queue;
 	unsigned int q;
+	u32 ctrl = macb_readl(bp, NCR);
 
 	/* Disable RX and TX (XXX: Should we halt the transmission
 	 * more gracefully?)
 	 */
-	macb_writel(bp, NCR, 0);
+	ctrl &= ~(MACB_BIT(RE) | MACB_BIT(TE));
 
 	/* Clear the stats registers (XXX: Update stats first?) */
-	macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
+	ctrl |= MACB_BIT(CLRSTAT);
+
+	macb_writel(bp, NCR, ctrl);
 
 	/* Clear all status flags */
 	macb_writel(bp, TSR, -1);
@@ -2170,6 +2173,7 @@ static void macb_init_hw(struct macb *bp)
 	unsigned int q;
 
 	u32 config;
+	u32 ctrl;
 
 	macb_reset_hw(bp);
 	macb_set_hwaddr(bp);
@@ -2223,7 +2227,9 @@ static void macb_init_hw(struct macb *bp)
 	}
 
 	/* Enable TX and RX */
-	macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE));
+	ctrl = macb_readl(bp, NCR);
+	ctrl |= MACB_BIT(RE) | MACB_BIT(TE);
+	macb_writel(bp, NCR, ctrl);
 }
 
 /* The hash address register is 64 bits long and takes up two
-- 
2.17.1