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FROMLIST: usb: xhci: provide a debugfs hook for erasing rom

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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@kernel.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Bug: 146449535
Change-Id: Id00beb2430efb8e735b6b98e5055cd2574f579b3
Link: https://lore.kernel.org/linux-arm-msm/20200113084005.849071-6-vkoul@kernel.org/
This commit is contained in:
Vinod Koul 2020-01-13 14:10:05 +05:30 committed by John Stultz
parent 6c95db3f5b
commit 8b159b7943
1 changed files with 35 additions and 0 deletions
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35
drivers/usb/host/xhci-pci-renesas.c
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@ -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>
@ -229,6 +230,9 @@ 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)
{
const struct renesas_fw_entry *entry;
@ -252,6 +256,7 @@ static int renesas_check_rom_state(struct pci_dev *pdev)
if (version == entry->expected_version) {
dev_dbg(&pdev->dev, "Detected valid ROM version..\n");
valid_version = true;
debugfs_init(pdev);
}
}
if (valid_version == false)
@ -536,6 +541,34 @@ 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)
{
@ -889,6 +922,8 @@ static int renesas_xhci_pci_probe(struct pci_dev *dev,
static void renesas_xhci_pci_remove(struct pci_dev *dev)
{
debugfs_exit();
if (renesas_fw_alive_check(dev)) {
/*
* bail out early, if this was a renesas device w/o FW.