spi: img-spfi: Limit bit clock to 1/4th of input clock

Although the SPFI BITCLK divider supports a value of up to 255, only
values up to 128 are usable.  This results in a maximum possible bit
clock rate of 1/4th the input clock rate.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-img-spfi.c b/drivers/spi/spi-img-spfi.c
index c01567d..99a3f7c 100644 (file)
--- a/drivers/spi/spi-img-spfi.c
+++ b/drivers/spi/spi-img-spfi.c
@@ -405,10 +405,10 @@ static void img_spfi_config(struct spi_master *master, struct spi_device *spi,
 
        /*
         * output = spfi_clk * (BITCLK / 512), where BITCLK must be a
-        * power of 2 up to 256 (where 255 == 256 since BITCLK is 8 bits)
+        * power of 2 up to 128
         */
-       div = DIV_ROUND_UP(master->max_speed_hz, xfer->speed_hz);
-       div = clamp(512 / (1 << get_count_order(div)), 1, 255);
+       div = DIV_ROUND_UP(clk_get_rate(spfi->spfi_clk), xfer->speed_hz);
+       div = clamp(512 / (1 << get_count_order(div)), 1, 128);
 
        val = spfi_readl(spfi, SPFI_DEVICE_PARAMETER(spi->chip_select));
        val &= ~(SPFI_DEVICE_PARAMETER_BITCLK_MASK <<
@@ -587,8 +587,8 @@ static int img_spfi_probe(struct platform_device *pdev)
        master->num_chipselect = 5;
        master->dev.of_node = pdev->dev.of_node;
        master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(8);
-       master->max_speed_hz = clk_get_rate(spfi->spfi_clk);
-       master->min_speed_hz = master->max_speed_hz / 512;
+       master->max_speed_hz = clk_get_rate(spfi->spfi_clk) / 4;
+       master->min_speed_hz = clk_get_rate(spfi->spfi_clk) / 512;
 
        master->set_cs = img_spfi_set_cs;
        master->transfer_one = img_spfi_transfer_one;