spi: Do spi_take_timestamp_pre for as many times as necessary

When dealing with a SPI controller driver that is sending more than 1
byte at once (or the entire buffer at once), and the SPI peripheral
driver has requested timestamping for a byte in the middle of the
buffer, we find that spi_take_timestamp_pre never records a "pre"
timestamp.

This happens because the function currently expects to be called with
the "progress" argument >= to what the peripheral has requested to be
timestamped. But clearly there are cases when that isn't going to fly.

And since we can't change the past when we realize that the opportunity
to take a "pre" timestamp has just passed and there isn't going to be
another one, the approach taken is to keep recording the "pre" timestamp
on each call, overwriting the previously recorded one until the "post"
timestamp is also taken.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20200304220044.11193-8-olteanv@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 292f268..6c223f7 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1515,17 +1515,15 @@ void spi_take_timestamp_pre(struct spi_controller *ctlr,
        if (!xfer->ptp_sts)
                return;
 
-       if (xfer->timestamped_pre)
+       if (xfer->timestamped)
                return;
 
-       if (progress < xfer->ptp_sts_word_pre)
+       if (progress > xfer->ptp_sts_word_pre)
                return;
 
        /* Capture the resolution of the timestamp */
        xfer->ptp_sts_word_pre = progress;
 
-       xfer->timestamped_pre = true;
-
        if (irqs_off) {
                local_irq_save(ctlr->irq_flags);
                preempt_disable();
@@ -1554,7 +1552,7 @@ void spi_take_timestamp_post(struct spi_controller *ctlr,
        if (!xfer->ptp_sts)
                return;
 
-       if (xfer->timestamped_post)
+       if (xfer->timestamped)
                return;
 
        if (progress < xfer->ptp_sts_word_post)
@@ -1570,7 +1568,7 @@ void spi_take_timestamp_post(struct spi_controller *ctlr,
        /* Capture the resolution of the timestamp */
        xfer->ptp_sts_word_post = progress;
 
-       xfer->timestamped_post = true;
+       xfer->timestamped = true;
 }
 EXPORT_SYMBOL_GPL(spi_take_timestamp_post);
 
@@ -1675,12 +1673,9 @@ void spi_finalize_current_message(struct spi_controller *ctlr)
                }
        }
 
-       if (unlikely(ctlr->ptp_sts_supported)) {
-               list_for_each_entry(xfer, &mesg->transfers, transfer_list) {
-                       WARN_ON_ONCE(xfer->ptp_sts && !xfer->timestamped_pre);
-                       WARN_ON_ONCE(xfer->ptp_sts && !xfer->timestamped_post);
-               }
-       }
+       if (unlikely(ctlr->ptp_sts_supported))
+               list_for_each_entry(xfer, &mesg->transfers, transfer_list)
+                       WARN_ON_ONCE(xfer->ptp_sts && !xfer->timestamped);
 
        spi_unmap_msg(ctlr, mesg);
 

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 600e379..8710527 100644 (file)
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -933,8 +933,7 @@ struct spi_transfer {
 
        struct ptp_system_timestamp *ptp_sts;
 
-       bool            timestamped_pre;
-       bool            timestamped_post;
+       bool            timestamped;
 
        struct list_head transfer_list;
 };