0bd694ea22
Backport accepted BCM5325 patches from net-next. These patches will be merged in the v6.17 kernel window. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
59 lines
2.1 KiB
Diff
59 lines
2.1 KiB
Diff
From 966a83df36c6f27476ac3501771422e7852098bc Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
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Date: Sat, 14 Jun 2025 10:00:00 +0200
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Subject: [PATCH] net: dsa: b53: ensure BCM5325 PHYs are enabled
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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According to the datasheet, BCM5325 uses B53_PD_MODE_CTRL_25 register to
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disable clocking to individual PHYs.
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Only ports 1-4 can be enabled or disabled and the datasheet is explicit
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about not toggling BIT(0) since it disables the PLL power and the switch.
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Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
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Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
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Link: https://patch.msgid.link/20250614080000.1884236-15-noltari@gmail.com
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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---
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drivers/net/dsa/b53/b53_common.c | 13 +++++++++++++
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drivers/net/dsa/b53/b53_regs.h | 5 ++++-
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2 files changed, 17 insertions(+), 1 deletion(-)
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--- a/drivers/net/dsa/b53/b53_common.c
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+++ b/drivers/net/dsa/b53/b53_common.c
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@@ -660,6 +660,19 @@ int b53_setup_port(struct dsa_switch *ds
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if (dsa_is_user_port(ds, port))
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b53_set_eap_mode(dev, port, EAP_MODE_SIMPLIFIED);
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+ if (is5325(dev) &&
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+ in_range(port, 1, 4)) {
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+ u8 reg;
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+
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+ b53_read8(dev, B53_CTRL_PAGE, B53_PD_MODE_CTRL_25, ®);
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+ reg &= ~PD_MODE_POWER_DOWN_PORT(0);
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+ if (dsa_is_unused_port(ds, port))
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+ reg |= PD_MODE_POWER_DOWN_PORT(port);
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+ else
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+ reg &= ~PD_MODE_POWER_DOWN_PORT(port);
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+ b53_write8(dev, B53_CTRL_PAGE, B53_PD_MODE_CTRL_25, reg);
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+ }
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+
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return 0;
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}
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EXPORT_SYMBOL(b53_setup_port);
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--- a/drivers/net/dsa/b53/b53_regs.h
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+++ b/drivers/net/dsa/b53/b53_regs.h
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@@ -103,8 +103,11 @@
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#define PORT_OVERRIDE_SPEED_2000M BIT(6) /* BCM5301X only, requires setting 1000M */
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#define PORT_OVERRIDE_EN BIT(7) /* Use the register contents */
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-/* Power-down mode control */
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+/* Power-down mode control (8 bit) */
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#define B53_PD_MODE_CTRL_25 0x0f
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+#define PD_MODE_PORT_MASK 0x1f
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+/* Bit 0 also powers down the switch. */
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+#define PD_MODE_POWER_DOWN_PORT(i) BIT(i)
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/* IP Multicast control (8 bit) */
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#define B53_IP_MULTICAST_CTRL 0x21
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