Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 7719b087 authored by Vinod Koul's avatar Vinod Koul Committed by John Stultz
Browse files

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



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: default avatarVinod Koul <vkoul@kernel.org>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
Bug: 146449535
Change-Id: Id00beb2430efb8e735b6b98e5055cd2574f579b3
Link: https://lore.kernel.org/linux-arm-msm/20200113084005.849071-6-vkoul@kernel.org/
parent ebc65c36

drivers/usb/host/xhci-pci-renesas.c

+35 −0
Original line number Diff line number Diff line
@@ -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.