spi: spacemit: Correct TX FIFO slot calculation

In k1_spi_write, the count variable is intended to represent the number
of slots available for writing into the TX FIFO.

The current implementation uses FIELD_GET(SSP_STATUS_TFL, val) in an
attempt to determine this count, but this register field returns the
number of occupied slots, not the available space. The previous
implementation attempted to handle this via a ternary operator (? :
K1_SPI_FIFO_SIZE), which incorrectly assumed that the hardware returned
0 when the FIFO was empty (meaning all slots were available), leading to
incorrect accounting of the buffer space.

Fix this by calculating the free slots: count = K1_SPI_FIFO_SIZE -
FIELD_GET(SSP_STATUS_TFL, val);

The associated comment has been updated to reflect the logic change: The
old comment reflected an incorrect assumption about the hardware
behavior, which was the root cause of the previous buggy logic.

This patch accurately and concisely describes the purpose of the new
calculation.

Signed-off-by: Peixin Xie <peixin.xie@spacemit.com>
Signed-off-by: Zhengyu He <hezhy472013@gmail.com>
Link: https://patch.msgid.link/20260715-k1-spi-tx-fifo-fix-v1-for-next-v1-1-02024223b08a@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-spacemit-k1.c b/drivers/spi/spi-spacemit-k1.c
index 215fe66d27b4dbf645814817f143e8affd11dbc6..0faf7ffed67665fb242520e2966ad349437a9829 100644 (file)
--- a/drivers/spi/spi-spacemit-k1.c
+++ b/drivers/spi/spi-spacemit-k1.c
@@ -494,8 +494,8 @@ static bool k1_spi_write(struct k1_spi_driver_data *drv_data, u32 val)
 {
        unsigned int count;
 
-       /* Get the number of open slots in the FIFO; zero means all */
-       count = FIELD_GET(SSP_STATUS_TFL, val) ? : K1_SPI_FIFO_SIZE;
+       /* Get the number of free slots in the FIFO */
+       count = K1_SPI_FIFO_SIZE - FIELD_GET(SSP_STATUS_TFL, val);
 
        /*
         * Limit how much we try to send at a time, to reduce the