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mtd: rawnand: brcmnand: When oops in progress use pio and interrupt polling 

If mtd_oops is in progress, switch to polling during NAND command
completion instead of relying on DMA/interrupts so that the mtd_oops
buffer can be completely written in the assigned NAND partition.

Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
This commit is contained in:
Kamal Dasu 2019-05-16 12:41:47 -04:00 committed by Miquel Raynal
parent 9f897bfdd8
commit c1ac2dc34b
1 changed files with 45 additions and 3 deletions
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48
drivers/mtd/nand/raw/brcmnand/brcmnand.c
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@ -151,6 +151,7 @@ struct brcmnand_controller {
u32 nand_cs_nand_xor;
u32 corr_stat_threshold;
u32 flash_dma_mode;
bool pio_poll_mode;
};
struct brcmnand_cfg {
@ -815,6 +816,20 @@ static inline bool has_flash_dma(struct brcmnand_controller *ctrl)
return ctrl->flash_dma_base;
}
static inline void disable_ctrl_irqs(struct brcmnand_controller *ctrl)
{
if (ctrl->pio_poll_mode)
return;
if (has_flash_dma(ctrl)) {
ctrl->flash_dma_base = 0;
disable_irq(ctrl->dma_irq);
}
disable_irq(ctrl->irq);
ctrl->pio_poll_mode = true;
}
static inline bool flash_dma_buf_ok(const void *buf)
{
return buf && !is_vmalloc_addr(buf) &&
@ -1229,15 +1244,42 @@ static void brcmnand_cmd_ctrl(struct nand_chip *chip, int dat,
/* intentionally left blank */
}
static bool brcmstb_nand_wait_for_completion(struct nand_chip *chip)
{
struct brcmnand_host *host = nand_get_controller_data(chip);
struct brcmnand_controller *ctrl = host->ctrl;
struct mtd_info *mtd = nand_to_mtd(chip);
bool err = false;
int sts;
if (mtd->oops_panic_write) {
/* switch to interrupt polling and PIO mode */
disable_ctrl_irqs(ctrl);
sts = bcmnand_ctrl_poll_status(ctrl, NAND_CTRL_RDY,
NAND_CTRL_RDY, 0);
err = (sts < 0) ? true : false;
} else {
unsigned long timeo = msecs_to_jiffies(
NAND_POLL_STATUS_TIMEOUT_MS);
/* wait for completion interrupt */
sts = wait_for_completion_timeout(&ctrl->done, timeo);
err = (sts <= 0) ? true : false;
}
return err;
}
static int brcmnand_waitfunc(struct nand_chip *chip)
{
struct brcmnand_host *host = nand_get_controller_data(chip);
struct brcmnand_controller *ctrl = host->ctrl;
unsigned long timeo = msecs_to_jiffies(100);
bool err = false;
dev_dbg(ctrl->dev, "wait on native cmd %d\n", ctrl->cmd_pending);
if (ctrl->cmd_pending &&
wait_for_completion_timeout(&ctrl->done, timeo) <= 0) {
if (ctrl->cmd_pending)
err = brcmstb_nand_wait_for_completion(chip);
if (err) {
u32 cmd = brcmnand_read_reg(ctrl, BRCMNAND_CMD_START)
>> brcmnand_cmd_shift(ctrl);