Hi, Greg,
On Fri, Jan 31, 2025 at 6:48 PM Greg Kroah-Hartman gregkh@linuxfoundation.org wrote:
On Fri, Jan 31, 2025 at 06:06:51PM +0800, Huacai Chen wrote:
LS7A EHCI controller doesn't have extended capabilities, so the EECP (EHCI Extended Capabilities Pointer) field of HCCPARAMS register should be 0x0, but it reads as 0xa0 now. This is a hardware flaw and will be fixed in future, now just clear the EECP field to avoid error messages on boot:
...... [ 0.581675] pci 0000:00:04.1: EHCI: unrecognized capability ff [ 0.581699] pci 0000:00:04.1: EHCI: unrecognized capability ff [ 0.581716] pci 0000:00:04.1: EHCI: unrecognized capability ff [ 0.581851] pci 0000:00:04.1: EHCI: unrecognized capability ff ...... [ 0.581916] pci 0000:00:05.1: EHCI: unrecognized capability ff [ 0.581951] pci 0000:00:05.1: EHCI: unrecognized capability ff [ 0.582704] pci 0000:00:05.1: EHCI: unrecognized capability ff [ 0.582799] pci 0000:00:05.1: EHCI: unrecognized capability ff ......
Cc: stable@vger.kernel.org Signed-off-by: Baoqi Zhang zhangbaoqi@loongson.cn Signed-off-by: Huacai Chen chenhuacai@loongson.cn
drivers/usb/host/pci-quirks.c | 4 ++++ include/linux/pci_ids.h | 1 + 2 files changed, 5 insertions(+)
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c index 1f9c1b1435d8..7e3151400a5e 100644 --- a/drivers/usb/host/pci-quirks.c +++ b/drivers/usb/host/pci-quirks.c @@ -958,6 +958,10 @@ static void quirk_usb_disable_ehci(struct pci_dev *pdev) * booting from USB disk or using a usb keyboard */ hcc_params = readl(base + EHCI_HCC_PARAMS);
if (pdev->vendor == PCI_VENDOR_ID_LOONGSON &&pdev->device == PCI_DEVICE_ID_LOONGSON_EHCI)hcc_params &= ~(0xffL << 8);offset = (hcc_params >> 8) & 0xff; while (offset && --count) { pci_read_config_dword(pdev, offset, &cap);diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h index de5deb1a0118..74a84834d9eb 100644 --- a/include/linux/pci_ids.h +++ b/include/linux/pci_ids.h @@ -162,6 +162,7 @@
#define PCI_VENDOR_ID_LOONGSON 0x0014
+#define PCI_DEVICE_ID_LOONGSON_EHCI 0x7a14
If you read the top of this file, does this patch meet the requirement to add this entry here to this file?
Emmm, the device id is also used in drivers/pci/controller/pci-loongson.c, but uses another code style so it is not suitable to share the definition. Maybe the best solution is use 0x7a14 directly.
Huacai
thanks,
greg k-h