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brcmfmac: reset SDIO bus on a firmware crash

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commit 4684997d9e ("brcmfmac: reset PCIe bus on a firmware crash")
adds a reset function to recover firmware trap for PCIe bus. This commit
adds an implementation for SDIO bus.

Upon SDIO firmware trap, do below:
 - Remove the device
 - Reset hardware
 - Probe the device again

Signed-off-by: Chi-Hsien Lin <chi-hsien.lin@cypress.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200622144851.165248-1-chi-hsien.lin@cypress.com
This commit is contained in:
Chi-Hsien Lin 2020-06-22 09:48:51 -05:00 committed by Kalle Valo
parent 0d9de08da5
commit 7836102a75
3 changed files with 38 additions and 3 deletions
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4
drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
View File

@ -863,7 +863,7 @@ static void brcmf_sdiod_freezer_detach(struct brcmf_sdio_dev *sdiodev)
}
#endif /* CONFIG_PM_SLEEP */
static int brcmf_sdiod_remove(struct brcmf_sdio_dev *sdiodev)
int brcmf_sdiod_remove(struct brcmf_sdio_dev *sdiodev)
{
sdiodev->state = BRCMF_SDIOD_DOWN;
if (sdiodev->bus) {
@ -898,7 +898,7 @@ static void brcmf_sdiod_host_fixup(struct mmc_host *host)
host->caps |= MMC_CAP_NONREMOVABLE;
}
static int brcmf_sdiod_probe(struct brcmf_sdio_dev *sdiodev)
int brcmf_sdiod_probe(struct brcmf_sdio_dev *sdiodev)
{
int ret = 0;
unsigned int f2_blksz = SDIO_FUNC2_BLOCKSIZE;

34
drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
View File

@ -16,6 +16,7 @@
#include <linux/mmc/sdio_ids.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/card.h>
#include <linux/mmc/core.h>
#include <linux/semaphore.h>
#include <linux/firmware.h>
#include <linux/module.h>
@ -4126,6 +4127,36 @@ int brcmf_sdio_get_fwname(struct device *dev, const char *ext, u8 *fw_name)
return 0;
}
static int brcmf_sdio_bus_reset(struct device *dev)
{
int ret = 0;
struct brcmf_bus *bus_if = dev_get_drvdata(dev);
struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
brcmf_dbg(SDIO, "Enter\n");
/* start by unregistering irqs */
brcmf_sdiod_intr_unregister(sdiodev);
brcmf_sdiod_remove(sdiodev);
/* reset the adapter */
sdio_claim_host(sdiodev->func1);
mmc_hw_reset(sdiodev->func1->card->host);
sdio_release_host(sdiodev->func1);
brcmf_bus_change_state(sdiodev->bus_if, BRCMF_BUS_DOWN);
ret = brcmf_sdiod_probe(sdiodev);
if (ret) {
brcmf_err("Failed to probe after sdio device reset: ret %d\n",
ret);
brcmf_sdiod_remove(sdiodev);
}
return ret;
}
static const struct brcmf_bus_ops brcmf_sdio_bus_ops = {
.stop = brcmf_sdio_bus_stop,
.preinit = brcmf_sdio_bus_preinit,
@ -4137,7 +4168,8 @@ static const struct brcmf_bus_ops brcmf_sdio_bus_ops = {
.get_ramsize = brcmf_sdio_bus_get_ramsize,
.get_memdump = brcmf_sdio_bus_get_memdump,
.get_fwname = brcmf_sdio_get_fwname,
.debugfs_create = brcmf_sdio_debugfs_create
.debugfs_create = brcmf_sdio_debugfs_create,
.reset = brcmf_sdio_bus_reset
};
#define BRCMF_SDIO_FW_CODE 0

3
drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
View File

@ -367,6 +367,9 @@ static inline void brcmf_sdiod_freezer_uncount(struct brcmf_sdio_dev *sdiodev)
}
#endif /* CONFIG_PM_SLEEP */
int brcmf_sdiod_probe(struct brcmf_sdio_dev *sdiodev);
int brcmf_sdiod_remove(struct brcmf_sdio_dev *sdiodev);
struct brcmf_sdio *brcmf_sdio_probe(struct brcmf_sdio_dev *sdiodev);
void brcmf_sdio_remove(struct brcmf_sdio *bus);
void brcmf_sdio_isr(struct brcmf_sdio *bus);