spi: sync up initial chipselect state

When initially probing the SPI slave device, the call for disabling an
SPI device without the SPI_CS_HIGH flag is not applied, as the
condition for checking whether or not the state to be applied equals the
one currently set evaluates to true.

This however might not necessarily be the case, as the chipselect might
be active.

Add a force flag to spi_set_cs which allows to override this
early exit condition. Set it to false everywhere except when called
from spi_setup to sync up the initial CS state.

Fixes commit d40f0b6f2e21 ("spi: Avoid setting the chip select if we don't
need to")

Signed-off-by: David Bauer <mail@david-bauer.net>
Link: https://lore.kernel.org/r/20210416195956.121811-1-mail@david-bauer.net
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 5e9d636777a2d7f808430fbc885537d790858b04..cf231ff467810e7739c108aad201e40c58889960 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -786,7 +786,7 @@ int spi_register_board_info(struct spi_board_info const *info, unsigned n)
 
 /*-------------------------------------------------------------------------*/
 
-static void spi_set_cs(struct spi_device *spi, bool enable)
+static void spi_set_cs(struct spi_device *spi, bool enable, bool force)
 {
        bool enable1 = enable;
 
@@ -794,7 +794,7 @@ static void spi_set_cs(struct spi_device *spi, bool enable)
         * Avoid calling into the driver (or doing delays) if the chip select
         * isn't actually changing from the last time this was called.
         */
-       if ((spi->controller->last_cs_enable == enable) &&
+       if (!force && (spi->controller->last_cs_enable == enable) &&
            (spi->controller->last_cs_mode_high == (spi->mode & SPI_CS_HIGH)))
                return;
 
@@ -1244,7 +1244,7 @@ static int spi_transfer_one_message(struct spi_controller *ctlr,
        struct spi_statistics *statm = &ctlr->statistics;
        struct spi_statistics *stats = &msg->spi->statistics;
 
-       spi_set_cs(msg->spi, true);
+       spi_set_cs(msg->spi, true, false);
 
        SPI_STATISTICS_INCREMENT_FIELD(statm, messages);
        SPI_STATISTICS_INCREMENT_FIELD(stats, messages);
@@ -1312,9 +1312,9 @@ fallback_pio:
                                         &msg->transfers)) {
                                keep_cs = true;
                        } else {
-                               spi_set_cs(msg->spi, false);
+                               spi_set_cs(msg->spi, false, false);
                                _spi_transfer_cs_change_delay(msg, xfer);
-                               spi_set_cs(msg->spi, true);
+                               spi_set_cs(msg->spi, true, false);
                        }
                }
 
@@ -1323,7 +1323,7 @@ fallback_pio:
 
 out:
        if (ret != 0 || !keep_cs)
-               spi_set_cs(msg->spi, false);
+               spi_set_cs(msg->spi, false, false);
 
        if (msg->status == -EINPROGRESS)
                msg->status = ret;
@@ -3399,11 +3399,11 @@ int spi_setup(struct spi_device *spi)
                 */
                status = 0;
 
-               spi_set_cs(spi, false);
+               spi_set_cs(spi, false, true);
                pm_runtime_mark_last_busy(spi->controller->dev.parent);
                pm_runtime_put_autosuspend(spi->controller->dev.parent);
        } else {
-               spi_set_cs(spi, false);
+               spi_set_cs(spi, false, true);
        }
 
        mutex_unlock(&spi->controller->io_mutex);