run "echo 1 > /sys/kernel/debug/renesas-usb/rom_erase" to erase firmware when driver is loaded. Subsequent init of driver shall reload the firmware Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx> --- drivers/usb/host/xhci-pci-renesas.c | 35 +++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/drivers/usb/host/xhci-pci-renesas.c b/drivers/usb/host/xhci-pci-renesas.c index d43b3a76dff5..c1088b07dfa9 100644 --- a/drivers/usb/host/xhci-pci-renesas.c +++ b/drivers/usb/host/xhci-pci-renesas.c @@ -2,6 +2,7 @@ /* Copyright (C) 2019-2020 Linaro Limited */ #include <linux/acpi.h> +#include <linux/debugfs.h> #include <linux/firmware.h> #include <linux/module.h> #include <linux/pci.h> @@ -162,6 +163,8 @@ static int renesas_fw_verify(struct pci_dev *dev, return 0; } +static void debugfs_init(struct pci_dev *pdev); + static int renesas_check_rom_state(struct pci_dev *pdev) { u16 rom_state; @@ -194,9 +197,11 @@ static int renesas_check_rom_state(struct pci_dev *pdev) /* Check the "Result Code" Bits (6:4) and act accordingly */ switch (rom_state & RENESAS_ROM_STATUS_RESULT) { case RENESAS_ROM_STATUS_SUCCESS: + debugfs_init(pdev); return 0; case RENESAS_ROM_STATUS_NO_RESULT: /* No result yet */ + debugfs_init(pdev); return 0; case RENESAS_ROM_STATUS_ERROR: /* Error State */ @@ -450,6 +455,34 @@ static void renesas_rom_erase(struct pci_dev *pdev) dev_dbg(&pdev->dev, "ROM Erase... Done success\n"); } +static int debugfs_rom_erase(void *data, u64 value) +{ + struct pci_dev *pdev = data; + + if (value == 1) { + dev_dbg(&pdev->dev, "Userspace requested ROM erase\n"); + renesas_rom_erase(pdev); + return 0; + } + return -EINVAL; +} +DEFINE_DEBUGFS_ATTRIBUTE(rom_erase_ops, NULL, debugfs_rom_erase, "%llu\n"); + +static struct dentry *debugfs_root; + +static void debugfs_init(struct pci_dev *pdev) +{ + debugfs_root = debugfs_create_dir("renesas_usb", NULL); + + debugfs_create_file("rom_erase", 0200, debugfs_root, + pdev, &rom_erase_ops); +} + +static void debugfs_exit(void) +{ + debugfs_remove_recursive(debugfs_root); +} + static bool renesas_download_rom(struct pci_dev *pdev, const u32 *fw, size_t step) { @@ -761,6 +794,8 @@ int renesas_xhci_pci_probe(struct pci_dev *dev, int renesas_xhci_pci_remove(struct pci_dev *dev) { + debugfs_exit(); + if (renesas_fw_check_running(dev)) { /* * bail out early, if this was a renesas device w/o FW. -- 2.25.1