spi: stm32: Simplify stm32h7_spi_prepare_fthlv()

Simplify stm32h7_spi_prepare_fthlv() function implementation,
no functional change intended.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alain Volmat <alain.volmat@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Amelie Delaunay <amelie.delaunay@st.com>
Cc: Antonio Borneo <antonio.borneo@st.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Roman Guskov <rguskov@dh-electronics.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-stm32@st-md-mailman.stormreply.com
To: linux-spi@vger.kernel.org
Link: https://lore.kernel.org/r/20210104123114.261596-1-marex@denx.de
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index be0fb16..db3e305 100644 (file)
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -473,34 +473,14 @@ static int stm32_spi_prepare_mbr(struct stm32_spi *spi, u32 speed_hz,
  */
 static u32 stm32h7_spi_prepare_fthlv(struct stm32_spi *spi, u32 xfer_len)
 {
-       u32 fthlv, half_fifo, packet;
+       u32 packet, bpw;
 
        /* data packet should not exceed 1/2 of fifo space */
-       half_fifo = (spi->fifo_size / 2);
-
-       /* data_packet should not exceed transfer length */
-       if (half_fifo > xfer_len)
-               packet = xfer_len;
-       else
-               packet = half_fifo;
-
-       if (spi->cur_bpw <= 8)
-               fthlv = packet;
-       else if (spi->cur_bpw <= 16)
-               fthlv = packet / 2;
-       else
-               fthlv = packet / 4;
+       packet = clamp(xfer_len, 1U, spi->fifo_size / 2);
 
        /* align packet size with data registers access */
-       if (spi->cur_bpw > 8)
-               fthlv += (fthlv % 2) ? 1 : 0;
-       else
-               fthlv += (fthlv % 4) ? (4 - (fthlv % 4)) : 0;
-
-       if (!fthlv)
-               fthlv = 1;
-
-       return fthlv;
+       bpw = DIV_ROUND_UP(spi->cur_bpw, 8);
+       return DIV_ROUND_UP(packet, bpw);
 }
 
 /**