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net: ethernet: mediatek: ppe: fix busy wait loop
The intention is for the loop to timeout if the body does not succeed.
The current logic calls time_is_before_jiffies(timeout) which is false
until after the timeout, so the loop body never executes.
Fix by using readl_poll_timeout as a more standard and less error-prone
solution.
Fixes: ba37b7caf1
("net: ethernet: mtk_eth_soc: add support for initializing the PPE")
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Cc: Felix Fietkau <nbd@nbd.name>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
c133acf38c
commit
c5d66587b8
2 changed files with 10 additions and 11 deletions
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@ -2,9 +2,8 @@
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/* Copyright (C) 2020 Felix Fietkau <nbd@nbd.name> */
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#include <linux/kernel.h>
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#include <linux/jiffies.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/etherdevice.h>
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#include <linux/platform_device.h>
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#include "mtk_ppe.h"
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@ -44,18 +43,17 @@ static u32 ppe_clear(struct mtk_ppe *ppe, u32 reg, u32 val)
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static int mtk_ppe_wait_busy(struct mtk_ppe *ppe)
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{
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unsigned long timeout = jiffies + HZ;
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int ret;
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u32 val;
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while (time_is_before_jiffies(timeout)) {
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if (!(ppe_r32(ppe, MTK_PPE_GLO_CFG) & MTK_PPE_GLO_CFG_BUSY))
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return 0;
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ret = readl_poll_timeout(ppe->base + MTK_PPE_GLO_CFG, val,
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!(val & MTK_PPE_GLO_CFG_BUSY),
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20, MTK_PPE_WAIT_TIMEOUT_US);
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usleep_range(10, 20);
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}
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if (ret)
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dev_err(ppe->dev, "PPE table busy");
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dev_err(ppe->dev, "PPE table busy");
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return -ETIMEDOUT;
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return ret;
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}
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static void mtk_ppe_cache_clear(struct mtk_ppe *ppe)
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@ -12,6 +12,7 @@
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#define MTK_PPE_ENTRIES_SHIFT 3
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#define MTK_PPE_ENTRIES (1024 << MTK_PPE_ENTRIES_SHIFT)
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#define MTK_PPE_HASH_MASK (MTK_PPE_ENTRIES - 1)
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#define MTK_PPE_WAIT_TIMEOUT_US 1000000
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#define MTK_FOE_IB1_UNBIND_TIMESTAMP GENMASK(7, 0)
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#define MTK_FOE_IB1_UNBIND_PACKETS GENMASK(23, 8)
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