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authorJiwei Sun <jiwei.sun@windriver.com>2019-01-18 04:32:29 +0100
committerMark Brown <broonie@kernel.org>2019-01-28 19:23:04 +0100
commit7aef2b646b24247d880a353e09d4e10614a61cd6 (patch)
tree2044cf9a54f92ee9d7e2c51e64982d405f0ff0bf /drivers/spi
parentspi: Kconfig: imx: Update the help text to make it more generic (diff)
downloadlinux-7aef2b646b24247d880a353e09d4e10614a61cd6.tar.xz
linux-7aef2b646b24247d880a353e09d4e10614a61cd6.zip
spi: pl022: add a message state STATE_TIMEOUT for timeout transfer
When transfer timeout, give -EAGAIN to the message's status, and it can make the spi device driver choose repeated transimation or not. And if transfer timeout, output some useful information for tracing the issue. Signed-off-by: Jiwei Sun <jiwei.sun@windriver.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-pl022.c30
1 files changed, 29 insertions, 1 deletions
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 0c793e31d60f..26684178786f 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -253,6 +253,7 @@
#define STATE_RUNNING ((void *) 1)
#define STATE_DONE ((void *) 2)
#define STATE_ERROR ((void *) -1)
+#define STATE_TIMEOUT ((void *) -2)
/*
* SSP State - Whether Enabled or Disabled
@@ -1484,6 +1485,30 @@ err_config_dma:
writew(irqflags, SSP_IMSC(pl022->virtbase));
}
+static void print_current_status(struct pl022 *pl022)
+{
+ u32 read_cr0;
+ u16 read_cr1, read_dmacr, read_sr;
+
+ if (pl022->vendor->extended_cr)
+ read_cr0 = readl(SSP_CR0(pl022->virtbase));
+ else
+ read_cr0 = readw(SSP_CR0(pl022->virtbase));
+ read_cr1 = readw(SSP_CR1(pl022->virtbase));
+ read_dmacr = readw(SSP_DMACR(pl022->virtbase));
+ read_sr = readw(SSP_SR(pl022->virtbase));
+
+ dev_warn(&pl022->adev->dev, "spi-pl022 CR0: %x\n", read_cr0);
+ dev_warn(&pl022->adev->dev, "spi-pl022 CR1: %x\n", read_cr1);
+ dev_warn(&pl022->adev->dev, "spi-pl022 DMACR: %x\n", read_dmacr);
+ dev_warn(&pl022->adev->dev, "spi-pl022 SR: %x\n", read_sr);
+ dev_warn(&pl022->adev->dev,
+ "spi-pl022 exp_fifo_level/fifodepth: %u/%d\n",
+ pl022->exp_fifo_level,
+ pl022->vendor->fifodepth);
+
+}
+
static void do_polling_transfer(struct pl022 *pl022)
{
struct spi_message *message = NULL;
@@ -1535,7 +1560,8 @@ static void do_polling_transfer(struct pl022 *pl022)
if (time_after(time, timeout)) {
dev_warn(&pl022->adev->dev,
"%s: timeout!\n", __func__);
- message->state = STATE_ERROR;
+ message->state = STATE_TIMEOUT;
+ print_current_status(pl022);
goto out;
}
cpu_relax();
@@ -1553,6 +1579,8 @@ out:
/* Handle end of message */
if (message->state == STATE_DONE)
message->status = 0;
+ else if (message->state == STATE_TIMEOUT)
+ message->status = -EAGAIN;
else
message->status = -EIO;