Re: [PATCH net v2 2/2] net: dsa: b53: Support setting learning on port

On 2/22/2021 3:18 PM, Vladimir Oltean wrote:

On Mon, Feb 22, 2021 at 02:30:10PM -0800, Florian Fainelli wrote:

quoted

diff --git a/drivers/net/dsa/b53/b53_regs.h b/drivers/net/dsa/b53/b53_regs.h
index c90985c294a2..b2c539a42154 100644
--- a/drivers/net/dsa/b53/b53_regs.h
+++ b/drivers/net/dsa/b53/b53_regs.h

@@ -115,6 +115,7 @@
 #define B53_UC_FLOOD_MASK		0x32
 #define B53_MC_FLOOD_MASK		0x34
 #define B53_IPMC_FLOOD_MASK		0x36
+#define B53_DIS_LEARNING		0x3c
 
 /*
  * Override Ports 0-7 State on devices with xMII interfaces (8 bit)

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 3eaedbb12815..5ee8103b8e9c 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c

@@ -223,23 +223,10 @@ static int bcm_sf2_port_setup(struct dsa_switch *ds, int port,
 	reg &= ~P_TXQ_PSM_VDD(port);
 	core_writel(priv, reg, CORE_MEM_PSM_VDD_CTRL);
 
-	/* Enable learning */
-	reg = core_readl(priv, CORE_DIS_LEARN);
-	reg &= ~BIT(port);
-	core_writel(priv, reg, CORE_DIS_LEARN);
-
 	/* Enable Broadcom tags for that port if requested */
-	if (priv->brcm_tag_mask & BIT(port)) {
+	if (priv->brcm_tag_mask & BIT(port))
 		b53_brcm_hdr_setup(ds, port);
 
-		/* Disable learning on ASP port */
-		if (port == 7) {
-			reg = core_readl(priv, CORE_DIS_LEARN);
-			reg |= BIT(port);
-			core_writel(priv, reg, CORE_DIS_LEARN);
-		}
-	}
-

In sf2, CORE_DIS_LEARN is at address 0xf0, while in b53, B53_DIS_LEARN
is at 0x3c. Are they even configuring the same thing?

They are the SF2 switch was integrated with a bridge that would flatten
its address space such that there would be no need to access the
registers indirectly like what b53_srab does.

This is the reason why we have the SF2_PAGE_REG_MKADDR() macro to
convert from a {page, offset} tuple to a memory mapped address and here
0x3c << 2 = 0xf0.
-- 
Florian