spi: gpio: No MISO does not imply no RX

There is a logical problem in spi-gpio with host just
assigning a MOSI line and no MISO: this is interpreted
as the host cannot do RX and the host is flagged with
SPI_MASTER_NO_RX.

This is wrong: since GPIO lines can switch direction,
in 3WIRE operation the host will simply reverse the
direction of the GPIO line and start reading from it,
there is even code for doing this in the driver, but
it went unnoticed because it was tested by using a
master with 4 wires but a device using just 3 wires.

Remove the offending flag.

Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c
index d0c6d71b6c0f..a2b08b464857 100644
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -295,9 +295,11 @@ static int spi_gpio_request(struct device *dev,
         spi_gpio->miso = devm_gpiod_get_optional(dev, "miso", GPIOD_IN);
         if (IS_ERR(spi_gpio->miso))
                 return PTR_ERR(spi_gpio->miso);
-        if (!spi_gpio->miso)
-                /* HW configuration without MISO pin */
-                *mflags |= SPI_MASTER_NO_RX;
+        /*
+         * No setting SPI_MASTER_NO_RX here - if there is only a MOSI
+         * pin connected the host can still do RX by changing the
+         * direction of the line.
+         */
 
         spi_gpio->sck = devm_gpiod_get(dev, "sck", GPIOD_OUT_LOW);
         if (IS_ERR(spi_gpio->mosi))
@@ -423,7 +425,7 @@ static int spi_gpio_probe(struct platform_device *pdev)
         spi_gpio->bitbang.chipselect = spi_gpio_chipselect;
         spi_gpio->bitbang.set_line_direction = spi_gpio_set_direction;
 
-        if ((master_flags & (SPI_MASTER_NO_TX | SPI_MASTER_NO_RX)) == 0) {
+        if ((master_flags & SPI_MASTER_NO_TX) == 0) {
                 spi_gpio->bitbang.txrx_word[SPI_MODE_0] = spi_gpio_txrx_word_mode0;
                 spi_gpio->bitbang.txrx_word[SPI_MODE_1] = spi_gpio_txrx_word_mode1;
                 spi_gpio->bitbang.txrx_word[SPI_MODE_2] = spi_gpio_txrx_word_mode2;