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20d74c6811
Backport qca8k fixes for big endian system (to make them working again) and a patch fixing MDIO conflicts if other PHY are connected and mgmt eth is used to control the switch. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
62 lines
2.4 KiB
Diff
62 lines
2.4 KiB
Diff
From 5652d1741574eb89cc02576e50ee3e348bd6dd77 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
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Date: Wed, 4 Oct 2023 11:19:03 +0200
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Subject: [PATCH 1/2] net: dsa: qca8k: fix regmap bulk read/write methods on
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big endian systems
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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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Commit c766e077d927 ("net: dsa: qca8k: convert to regmap read/write
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API") introduced bulk read/write methods to qca8k's regmap.
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The regmap bulk read/write methods get the register address in a buffer
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passed as a void pointer parameter (the same buffer contains also the
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read/written values). The register address occupies only as many bytes
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as it requires at the beginning of this buffer. For example if the
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.reg_bits member in regmap_config is 16 (as is the case for this
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driver), the register address occupies only the first 2 bytes in this
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buffer, so it can be cast to u16.
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But the original commit implementing these bulk read/write methods cast
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the buffer to u32:
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u32 reg = *(u32 *)reg_buf & U16_MAX;
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taking the first 4 bytes. This works on little endian systems where the
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first 2 bytes of the buffer correspond to the low 16-bits, but it
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obviously cannot work on big endian systems.
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Fix this by casting the beginning of the buffer to u16 as
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u32 reg = *(u16 *)reg_buf;
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Fixes: c766e077d927 ("net: dsa: qca8k: convert to regmap read/write API")
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Signed-off-by: Marek Behún <kabel@kernel.org>
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Tested-by: Christian Marangi <ansuelsmth@gmail.com>
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Reviewed-by: Christian Marangi <ansuelsmth@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/dsa/qca/qca8k-8xxx.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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--- a/drivers/net/dsa/qca/qca8k-8xxx.c
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+++ b/drivers/net/dsa/qca/qca8k-8xxx.c
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@@ -504,8 +504,8 @@ qca8k_bulk_read(void *ctx, const void *r
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void *val_buf, size_t val_len)
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{
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int i, count = val_len / sizeof(u32), ret;
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- u32 reg = *(u32 *)reg_buf & U16_MAX;
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struct qca8k_priv *priv = ctx;
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+ u32 reg = *(u16 *)reg_buf;
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if (priv->mgmt_master &&
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!qca8k_read_eth(priv, reg, val_buf, val_len))
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@@ -526,8 +526,8 @@ qca8k_bulk_gather_write(void *ctx, const
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const void *val_buf, size_t val_len)
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{
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int i, count = val_len / sizeof(u32), ret;
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- u32 reg = *(u32 *)reg_buf & U16_MAX;
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struct qca8k_priv *priv = ctx;
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+ u32 reg = *(u16 *)reg_buf;
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u32 *val = (u32 *)val_buf;
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if (priv->mgmt_master &&
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