[PATCH net] can: m_can: pci: fix iomap_read_fifo() and iomap_write_fifo()

From: Matthias Schiffer
Date: Thu Nov 18 2021 - 09:41:48 EST


The same fix that was previously done in m_can_platform in commit
99d173fbe894 ("can: m_can: fix iomap_read_fifo() and iomap_write_fifo()")
is required in m_can_pci as well to make iomap_read_fifo() and
iomap_write_fifo() work for val_count > 1.

Fixes: 812270e5445b ("can: m_can: Batch FIFO writes during CAN transmit")
Fixes: 1aa6772f64b4 ("can: m_can: Batch FIFO reads during CAN receive")
Signed-off-by: Matthias Schiffer <matthias.schiffer@xxxxxxxxxxxxxxx>
---
drivers/net/can/m_can/m_can_pci.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/m_can/m_can_pci.c b/drivers/net/can/m_can/m_can_pci.c
index 8bbbaa264f0d..b56a54d6c5a9 100644
--- a/drivers/net/can/m_can/m_can_pci.c
+++ b/drivers/net/can/m_can/m_can_pci.c
@@ -47,8 +47,13 @@ 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_pci_priv *priv = cdev_to_priv(cdev);
+ void __iomem *src = priv->base + offset;

- ioread32_rep(priv->base + offset, val, val_count);
+ while (val_count--) {
+ *(unsigned int *)val = ioread32(src);
+ val += 4;
+ src += 4;
+ }

return 0;
}
@@ -66,8 +71,13 @@ static int iomap_write_fifo(struct m_can_classdev *cdev, int offset,
const void *val, size_t val_count)
{
struct m_can_pci_priv *priv = cdev_to_priv(cdev);
+ void __iomem *dst = priv->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