Applied "spi: imx: set spi_bus_clk for mx21 and mx27" to the spi tree

Commit Message

Mark Brown Nov. 2, 2016, 4:53 p.m. UTC

The patch

   spi: imx: set spi_bus_clk for mx21 and mx27

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 32df9ff2b88f9b3ef0865837cd6a39c957dab875 Mon Sep 17 00:00:00 2001
From: Robert Baldyga <[e-mail]>
Date: Tue, 1 Nov 2016 22:18:39 +0100
Subject: [PATCH] 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 <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>
---
 drivers/spi/spi-imx.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

Patch

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)