[PATCH 1/8] pci: pci_mvebu: Fix write_config() with PCI_SIZE_8 or PCI_SIZE_16

Pali Rohár
2021-10-22T14:23:00Z

Current implementation of write_config() is broken for PCI_SIZE_8 or
PCI_SIZE_16 as it always uses writel(), which means that write operation
is always 32-bit, so upper 24 bits for PCI_SIZE_8 and upper 16 bits for
PCI_SIZE_16 are cleared.

Fix this by using writeb() and writew(), respectively.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
---
drivers/pci/pci_mvebu.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pci_mvebu.c b/drivers/pci/pci_mvebu.c
index 0c1d7cd770f1..8175511514ab 100644
--- a/drivers/pci/pci_mvebu.c
+++ b/drivers/pci/pci_mvebu.c
@@ -211,8 +211,19 @@ static int mvebu_pcie_write_config(struct udevice *bus, pci_dev_t bdf,
writel(PCIE_CONF_ADDR(bdf, offset), pcie->base + PCIE_CONF_ADDR_OFF);

/* write data */
- data = pci_conv_size_to_32(0, value, offset, size);
- writel(data, pcie->base + PCIE_CONF_DATA_OFF);
+ switch (size) {
+ case PCI_SIZE_8:
+ writeb(value, pcie->base + PCIE_CONF_DATA_OFF + (offset & 3));
+ break;
+ case PCI_SIZE_16:
+ writew(value, pcie->base + PCIE_CONF_DATA_OFF + (offset & 2));
+ break;
+ case PCI_SIZE_32:
+ writel(value, pcie->base + PCIE_CONF_DATA_OFF);
+ break;
+ default:
+ return -EINVAL;
+ }

return 0;
}
--
2.20.1