[PATCH] can: m_can: m_can_platform: Fix iomap_read_fifo() and iomap_write_fifo()
From: Aswath Govindraju <hidden>
Date: 2021-09-20 12:26:44
Also in:
linux-can, lkml
Subsystem:
can network drivers, mcan device driver, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Markus Schneider-Pargmann, Linus Torvalds
The read an writes from the fifo are from a buffer with various fields and
data at predefined offsets. So, they reads and writes should not be done to
the same address(or port) in case of val_count greater than 1. Therefore,
fix this by using iowrite32/ioread32 instead of ioread32_rep/iowrite32_rep.
Also, the write into fifo must be performed with an offset from the message
ram base address. Therefore, fix the base address to mram_base.
Fixes: e39381770ec9 ("can: m_can: Disable IRQs on FIFO bus errors")
Signed-off-by: Aswath Govindraju <redacted>
---
drivers/net/can/m_can/m_can_platform.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
index 308d4f2fff00..eee47bad0592 100644
--- a/drivers/net/can/m_can/m_can_platform.c
+++ b/drivers/net/can/m_can/m_can_platform.c@@ -32,8 +32,13 @@ static u32 iomap_read_reg(struct m_can_classdev *cdev, int reg) static int iomap_read_fifo(struct m_can_classdev *cdev, int offset, void *val, size_t val_count) { struct m_can_plat_priv *priv = cdev_to_priv(cdev); + void __iomem *src = priv->mram_base + offset; - ioread32_rep(priv->mram_base + offset, val, val_count); + while (val_count--) { + *(unsigned int *)val = ioread32(src); + val += 4; + src += 4; + } return 0; }
@@ -51,8 +56,13 @@ static int iomap_write_fifo(struct m_can_classdev *cdev, int offset, const void *val, size_t val_count) { struct m_can_plat_priv *priv = cdev_to_priv(cdev); + void __iomem *dst = priv->mram_base + offset; - iowrite32_rep(priv->base + offset, val, val_count); + while (val_count--) { + iowrite32(*(unsigned int *)val, dst); + val += 4; + dst += 4; + } return 0; }
--
2.17.1