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mvebu: add a patch to deal with excessive latencies/delays during flash PIO command processing

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Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2016-06-10 10:47:34 +02:00
parent a88fc0db9d
commit 13ea815b6c
1 changed files with 36 additions and 0 deletions
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36
target/linux/mvebu/patches-4.4/110-pxa3xxx_nand-handle-PIO-delays.patch Normal file
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@ -0,0 +1,36 @@
Handle delays/excessive latency during flash command processing with PIO.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -227,6 +227,7 @@ struct pxa3xx_nand_info {
int use_dma; /* use DMA ? */
int use_spare; /* use spare ? */
int need_wait;
+ int pio_progress;
/* Amount of real data per full chunk */
unsigned int chunk_size;
@@ -769,6 +770,7 @@ static irqreturn_t pxa3xx_nand_irq_threa
{
struct pxa3xx_nand_info *info = data;
+ info->pio_progress = 1;
handle_data_pio(info);
info->state = STATE_CMD_DONE;
@@ -1175,8 +1177,13 @@ static void nand_cmdfunc(struct mtd_info
info->need_wait = 1;
pxa3xx_nand_start(info);
+retry:
+ info->pio_progress = 0;
if (!wait_for_completion_timeout(&info->cmd_complete,
CHIP_DELAY_TIMEOUT)) {
+ if (info->pio_progress)
+ goto retry;
+
dev_err(&info->pdev->dev, "Wait time out!!!\n");
/* Stop State Machine for next command cycle */
pxa3xx_nand_stop(info);