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cnss2: Add support to handle SOL GPIOs

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The side-band SOL (Sign-Of-Life) GPIOs are introduced to help make
RDDM more reliable so that device dump can be copied correctly. When
device SOL GPIO is triggered from device, it means there is watchdog
reset happened in device and driver should expect RDDM to happen.
When host SOL GPIO is triggered from host, it will result watchdog
reset as well as PCIe controller reset in device which should try to
enter RDDM always. This commit also adds debug hooks for the GPIOs.

Change-Id: I61a0f252d04ab0a62c5bf838850fe9a1bec2273b
This commit is contained in:
Yue Ma
2021-06-29 11:30:27 -07:00
parent 9c8339eabe
commit c4cba5ad7b
8 changed files with 303 additions and 11 deletions
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14
cnss2/debug.c
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@@ -143,11 +143,21 @@ static int cnss_stats_show_state(struct seq_file *s,
return 0;
}
static int cnss_stats_show_gpio_state(struct seq_file *s,
struct cnss_plat_data *plat_priv)
{
seq_printf(s, "\nHost SOL: %d", cnss_get_host_sol_value(plat_priv));
seq_printf(s, "\nDev SOL: %d", cnss_get_dev_sol_value(plat_priv));
return 0;
}
static int cnss_stats_show(struct seq_file *s, void *data)
{
struct cnss_plat_data *plat_priv = s->private;
cnss_stats_show_state(s, plat_priv);
cnss_stats_show_gpio_state(s, plat_priv);
return 0;
}
@@ -204,6 +214,10 @@ static ssize_t cnss_dev_boot_debug_write(struct file *fp,
CNSS_DRIVER_EVENT_POWER_DOWN,
0, NULL);
clear_bit(CNSS_DRIVER_DEBUG, &plat_priv->driver_state);
} else if (sysfs_streq(cmd, "assert_host_sol")) {
ret = cnss_set_host_sol_value(plat_priv, 1);
} else if (sysfs_streq(cmd, "deassert_host_sol")) {
ret = cnss_set_host_sol_value(plat_priv, 0);
} else {
pci_priv = plat_priv->bus_priv;
if (!pci_priv)