diff options
| author | Vignesh R <vigneshr@ti.com> | 2016-11-05 16:05:16 +0530 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-11-13 15:54:37 -0500 |
| commit | 948b8bbd5fc4722ec10e0ffde29d31d982f6a6e4 (patch) | |
| tree | bb63e2efb3fd580df536632e9daa609862c91afe /drivers | |
| parent | 84295f2a202b6c062ec17e148e3418af0db795f5 (diff) | |
spi: ti_qspi: Fix baudrate divider calculation
Fix the divider calculation logic to choose a value so that the
resulting baudrate is either equal to or closest possible baudrate less
than the requested value. While at that, cleanup ti_spi_set_speed().
Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/ti_qspi.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/drivers/spi/ti_qspi.c b/drivers/spi/ti_qspi.c index 52520dff63..da04886590 100644 --- a/drivers/spi/ti_qspi.c +++ b/drivers/spi/ti_qspi.c @@ -16,6 +16,7 @@ #include <asm/omap_gpio.h> #include <asm/omap_common.h> #include <asm/ti-common/ti-edma3.h> +#include <linux/kernel.h> DECLARE_GLOBAL_DATA_PTR; @@ -118,21 +119,18 @@ static void ti_spi_set_speed(struct ti_qspi_priv *priv, uint hz) if (!hz) clk_div = 0; else - clk_div = (priv->fclk / hz) - 1; + clk_div = DIV_ROUND_UP(priv->fclk, hz) - 1; + + /* truncate clk_div value to QSPI_CLK_DIV_MAX */ + if (clk_div > QSPI_CLK_DIV_MAX) + clk_div = QSPI_CLK_DIV_MAX; debug("ti_spi_set_speed: hz: %d, clock divider %d\n", hz, clk_div); /* disable SCLK */ writel(readl(&priv->base->clk_ctrl) & ~QSPI_CLK_EN, &priv->base->clk_ctrl); - - /* assign clk_div values */ - if (clk_div < 0) - clk_div = 0; - else if (clk_div > QSPI_CLK_DIV_MAX) - clk_div = QSPI_CLK_DIV_MAX; - - /* enable SCLK */ + /* enable SCLK and program the clk divider */ writel(QSPI_CLK_EN | clk_div, &priv->base->clk_ctrl); } |