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From: Vignesh R <vigneshr@ti.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 2/2] spi: ti_qspi: Fix baudrate divider calculation
Date: Wed, 12 Oct 2016 09:46:20 +0530	[thread overview]
Message-ID: <20161012041620.25077-2-vigneshr@ti.com> (raw)
In-Reply-To: <20161012041620.25077-1-vigneshr@ti.com>

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.

Signed-off-by: Vignesh R <vigneshr@ti.com>
---
 drivers/spi/ti_qspi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/ti_qspi.c b/drivers/spi/ti_qspi.c
index 52520dff6325..d97e2479d1b3 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;
 
@@ -118,7 +119,7 @@ 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;
 
 	debug("ti_spi_set_speed: hz: %d, clock divider %d\n", hz, clk_div);
 
-- 
2.10.1

  reply	other threads:[~2016-10-12  4:16 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-12  4:16 [U-Boot] [PATCH 1/2] ARM: dts: dra7xx: Update spi-max-frequency for qspi slave node Vignesh R
2016-10-12  4:16 ` Vignesh R [this message]
2016-10-13 12:11   ` [U-Boot] [PATCH 2/2] spi: ti_qspi: Fix baudrate divider calculation Jagan Teki
2016-10-14  5:24     ` Vignesh R
2016-10-14  6:57       ` Jagan Teki
2016-10-14 10:48         ` R, Vignesh
2016-10-26  7:06           ` Jagan Teki
2016-10-14 10:47   ` [U-Boot] [PATCH v2 " Vignesh R
2016-10-13 12:13 ` [U-Boot] [PATCH 1/2] ARM: dts: dra7xx: Update spi-max-frequency for qspi slave node Jagan Teki

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