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authorRobert Baldyga <r.baldyga@hackerion.com>2016-11-01 22:18:39 +0100
committerMark Brown <broonie@kernel.org>2016-11-02 09:30:43 -0600
commit32df9ff2b88f9b3ef0865837cd6a39c957dab875 (patch)
treee4f49ad83d6030c856e05fa0e995791bae4dbe26 /drivers/spi/spi-imx.c
parent2dd33f9cec90499029fd49ffae2922c3f9ccad11 (diff)
downloadlinux-32df9ff2b88f9b3ef0865837cd6a39c957dab875.tar.bz2
spi: imx: set spi_bus_clk for mx21 and mx27
Introduce additional output parameter in spi_imx_clkdiv_1() function to return result frequency and set it to spi_bus_clk. This fixes division by zero bug, which occurred in spi_imx_calculate_timeout() function. Signed-off-by: Robert Baldyga <r.baldyga@hackerion.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-imx.c')
-rw-r--r--drivers/spi/spi-imx.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 08124b29665e..32ced64a5bb9 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -173,15 +173,16 @@ static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
/* MX21, MX27 */
static unsigned int spi_imx_clkdiv_1(unsigned int fin,
- unsigned int fspi, unsigned int max)
+ unsigned int fspi, unsigned int max, unsigned int *fres)
{
int i;
for (i = 2; i < max; i++)
if (fspi * mxc_clkdivs[i] >= fin)
- return i;
+ break;
- return max;
+ *fres = fin / mxc_clkdivs[i];
+ return i;
}
/* MX1, MX31, MX35, MX51 CSPI */
@@ -589,9 +590,12 @@ static int mx21_config(struct spi_device *spi, struct spi_imx_config *config)
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
+ unsigned int clk;
+
+ reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max, &clk)
+ << MX21_CSPICTRL_DR_SHIFT;
+ spi_imx->spi_bus_clk = clk;
- reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max) <<
- MX21_CSPICTRL_DR_SHIFT;
reg |= config->bpw - 1;
if (spi->mode & SPI_CPHA)