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authorMaxim Levitsky <maximlevitsky@gmail.com>2010-06-02 16:01:46 +0300
committerDavid Woodhouse <David.Woodhouse@intel.com>2010-06-02 14:53:40 +0100
commit9489be8ca234c07666e88a4472e4d5f2a2425aa5 (patch)
treec5bbb7a4b0926d830c6a5a275496284acd9efc3b
parentcc1fed00c9ba84f38717a6cab84409cd48f340e3 (diff)
mtd/r852: Fixes in case of DMA timeout
* Don't call complete on dma completion * do a INIT_COMPLETE before using it each time * Report DMA read error via ecc 'correct' I finally managed to make my system do suspend to ram propertly, and I see that if card was inserted during suspend (while system was off), I get dma timeouts on resume. Simple card reinsert solves the issue. This patch solves a crash that would happen otherwise Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
-rw-r--r--drivers/mtd/nand/r852.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/mtd/nand/r852.c b/drivers/mtd/nand/r852.c
index 20a654a94d30..3f219e61df7d 100644
--- a/drivers/mtd/nand/r852.c
+++ b/drivers/mtd/nand/r852.c
@@ -150,7 +150,6 @@ static void r852_dma_done(struct r852_device *dev, int error)
if (dev->phys_dma_addr && dev->phys_dma_addr != dev->phys_bounce_buffer)
pci_unmap_single(dev->pci_dev, dev->phys_dma_addr, R852_DMA_LEN,
dev->dma_dir ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE);
- complete(&dev->dma_done);
}
/*
@@ -182,6 +181,7 @@ static void r852_do_dma(struct r852_device *dev, uint8_t *buf, int do_read)
/* Set dma direction */
dev->dma_dir = do_read;
dev->dma_stage = 1;
+ INIT_COMPLETION(dev->dma_done);
dbg_verbose("doing dma %s ", do_read ? "read" : "write");
@@ -494,6 +494,11 @@ int r852_ecc_correct(struct mtd_info *mtd, uint8_t *dat,
if (dev->card_unstable)
return 0;
+ if (dev->dma_error) {
+ dev->dma_error = 0;
+ return -1;
+ }
+
r852_write_reg(dev, R852_CTL, dev->ctlreg | R852_CTL_ECC_ACCESS);
ecc_reg = r852_read_reg_dword(dev, R852_DATALINE);
r852_write_reg(dev, R852_CTL, dev->ctlreg);
@@ -796,6 +801,7 @@ static irqreturn_t r852_irq(int irq, void *data)
if (dma_status & R852_DMA_IRQ_ERROR) {
dbg("recieved dma error IRQ");
r852_dma_done(dev, -EIO);
+ complete(&dev->dma_done);
goto out;
}
@@ -825,8 +831,10 @@ static irqreturn_t r852_irq(int irq, void *data)
r852_dma_enable(dev);
/* Operation done */
- if (dev->dma_stage == 3)
+ if (dev->dma_stage == 3) {
r852_dma_done(dev, 0);
+ complete(&dev->dma_done);
+ }
goto out;
}
@@ -1082,7 +1090,7 @@ int r852_resume(struct device *device)
dev->card_detected ? "added" : "removed");
queue_delayed_work(dev->card_workqueue,
- &dev->card_detect_work, 1000);
+ &dev->card_detect_work, msecs_to_jiffies(1000));
return 0;
}