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dm: passthru: reset wifi chip via gpio

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During UOS reboot, sometime the wifi firmware status is wrong and can't
handled by UOS driver, this patch add gpio reset for the wifi chip to avoid
such error.

Tracked-On: #2328
Signed-off-by: Binbin Wu <binbin.wu@intel.com>
This commit is contained in:
Binbin Wu 2019-01-14 09:56:03 +08:00 committed by wenlingz
parent a021cb26bb
commit a4014db275
1 changed files with 61 additions and 1 deletions
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62
devicemodel/hw/pci/passthrough.c
View File

@ -39,6 +39,7 @@
#include <pciaccess.h>
#include <fcntl.h>
#include <unistd.h>
#include <dm_string.h>
#include "iodev.h"
#include "vmmapi.h"
@ -113,6 +114,7 @@ struct passthru_dev {
* need_reset - reset dev before passthrough
*/
bool need_reset;
int gpio_reset_pin;
/* The memory pages, which not overlap with MSI-X table will be
* passed-through to guest, two potential ranges, before and after MSI-X
* Table if any.
@ -739,6 +741,40 @@ pciaccess_init(void)
return 0; /* success */
}
static int
passthru_gpio_reset(int gpio_pin)
{
char s_gpio_path[40];
int fd;
if (gpio_pin < 0 || gpio_pin > 10000)
return -1;
/* reset the device via gpio */
snprintf(s_gpio_path, 40, "/sys/class/gpio/gpio%d/value", gpio_pin);
fd = open(s_gpio_path, O_WRONLY);
if (fd < 0)
return -1;
if(write(fd, "0", 1) < 0) {
warnx("failed to clear pin %d", gpio_pin);
close(fd);
return -1;
}
usleep(100);
if(write(fd, "1", 1) < 0) {
warnx("failed to set pin %d", gpio_pin);
close(fd);
return -1;
}
close(fd);
return 0;
}
/*
* Passthrough device initialization function:
* - initialize virtual config space
@ -760,6 +796,7 @@ passthru_init(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
char *opt;
bool keep_gsi = false;
bool need_reset = false;
int gpio_reset_pin = -1;
ptdev = NULL;
error = -EINVAL;
@ -780,7 +817,11 @@ passthru_init(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
keep_gsi = true;
else if (!strncmp(opt, "reset", 5))
need_reset = true;
else
else if (!strncmp(opt, "gpio_rst", 8)) {
opt = strsep(&opts, ",");
if (opt)
dm_strtoi(opt, &opt, 10, &gpio_reset_pin);
} else
warnx("Invalid passthru options:%s", opt);
}
@ -798,6 +839,7 @@ passthru_init(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
ptdev->phys_bdf = PCI_BDF(bus, slot, func);
ptdev->need_reset = need_reset;
ptdev->gpio_reset_pin = gpio_reset_pin;
update_pt_info(ptdev->phys_bdf);
error = pciaccess_init();
@ -858,6 +900,16 @@ passthru_init(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
ptdev->phys_pin = read_config(ptdev->phys_dev, PCIR_INTLINE, 1);
/* Somehow, after reset the gpio pin 460, the physical pin get will be 0xff,
* hardcode the value for wifi device on apl-mrb as a workaround.
*/
if(ptdev->phys_pin == 0xff) {
if(read_config(ptdev->phys_dev, PCIR_VENDOR, 2) == 0x11ab &&
read_config(ptdev->phys_dev, PCIR_DEVICE, 2) ==0x2b38) {
ptdev->phys_pin = 21;
}
}
if (ptdev->phys_pin == -1 || ptdev->phys_pin > 256) {
warnx("ptdev %x/%x/%x has wrong phys_pin %d, likely fail!",
bus, slot, func, ptdev->phys_pin);
@ -928,6 +980,14 @@ passthru_deinit(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
}
pciaccess_cleanup();
if (ptdev->gpio_reset_pin >= 0) {
warnx("Do gpio reset for device %x/%x/%x", bus, slot, func);
if (passthru_gpio_reset(ptdev->gpio_reset_pin))
warnx("Failed to do gpio reset for device %x/%x/%x ", bus, slot, func);
usleep(10000);
}
free(ptdev);
vm_unassign_ptdev(ctx, bus, slot, func);
}