From e4d313ff79a8b5622a8c4954ba37c6564fa922c4 Mon Sep 17 00:00:00 2001 From: Takashi Yoshii Date: Mon, 2 Dec 2013 03:19:13 +0900 Subject: [PATCH] spi: spi-sh-msiof: round up div to fix freq calculation Truncation on integer division in sh_msiof_spi_set_clk_regs() results in insufficient transfer frequency (> max_speed_freq). For example, source 52MHz, required max 6MHz 52/6 = 8.6 --> 8, then 1/8 table selected, and result in 52/8 = 6.5 MHz (>6MHz) Rounding it up is a simple solution. 52/6 = 8.6 --> 9, then 1/16 table selected, and result in 52/16 = 3.25 MHz Signed-off-by: Takashi Yoshii Signed-off-by: Mark Brown --- drivers/spi/spi-sh-msiof.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c index c74298c..ac8795f 100644 --- a/drivers/spi/spi-sh-msiof.c +++ b/drivers/spi/spi-sh-msiof.c @@ -152,7 +152,7 @@ static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p, size_t k; if (!WARN_ON(!spi_hz || !parent_rate)) - div = parent_rate / spi_hz; + div = DIV_ROUND_UP(parent_rate, spi_hz); /* TODO: make more fine grained */ -- 2.7.4