From: Pali Rohár Date: Fri, 22 Oct 2021 14:22:09 +0000 (+0200) Subject: pci: pci_mvebu: Fix read_config() with PCI_SIZE_8 or PCI_SIZE_16 X-Git-Url: http://git.dujemihanovic.xyz/img/sics.gif?a=commitdiff_plain;h=657177ad8e240ea520eba26da5c0ba47bd935787;p=u-boot.git pci: pci_mvebu: Fix read_config() with PCI_SIZE_8 or PCI_SIZE_16 When reading 8 or 16 bits from config space, use appropriate readb() or readw() calls. This ensures that PCIe controller does not read more bits from endpoint card as asked by read_config() function. Technically there should not be an issue with reading data from config space which are not later used as there are no clear-by-read registers. But it is better to use correct read operation based on requested size. Signed-off-by: Pali Rohár Reviewed-by: Marek Behún Reviewed-by: Stefan Roese --- diff --git a/drivers/pci/pci_mvebu.c b/drivers/pci/pci_mvebu.c index 8175511514..3991086e0d 100644 --- a/drivers/pci/pci_mvebu.c +++ b/drivers/pci/pci_mvebu.c @@ -184,9 +184,22 @@ static int mvebu_pcie_read_config(const struct udevice *bus, pci_dev_t bdf, writel(PCIE_CONF_ADDR(bdf, offset), pcie->base + PCIE_CONF_ADDR_OFF); /* read data */ - data = readl(pcie->base + PCIE_CONF_DATA_OFF); + switch (size) { + case PCI_SIZE_8: + data = readb(pcie->base + PCIE_CONF_DATA_OFF + (offset & 3)); + break; + case PCI_SIZE_16: + data = readw(pcie->base + PCIE_CONF_DATA_OFF + (offset & 2)); + break; + case PCI_SIZE_32: + data = readl(pcie->base + PCIE_CONF_DATA_OFF); + break; + default: + return -EINVAL; + } + debug("(addr,size,val)=(0x%04x, %d, 0x%08x)\n", offset, size, data); - *valuep = pci_conv_32_to_size(data, offset, size); + *valuep = data; return 0; }