X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=blobdiff_plain;f=drivers%2Fspi%2Fspi_txx9.c;h=dfa024b633e173787dd7c467d7581b27f2d0fd79;hp=c166eb5ad3c501ddbe718fe68c1b9fb13e7ce89e;hb=bf931a01a2c024a54204b4b02276af6e8d99a2c0;hpb=d53342bf9616ecd7e4a03fece167d0f53b195e87;ds=sidebyside

diff --git a/drivers/spi/spi_txx9.c b/drivers/spi/spi_txx9.c
index c166eb5ad3c5..dfa024b633e1 100644
--- a/drivers/spi/spi_txx9.c
+++ b/drivers/spi/spi_txx9.c
@@ -29,6 +29,8 @@
 
 
 #define SPI_FIFO_SIZE 4
+#define SPI_MAX_DIVIDER 0xff	/* Max. value for SPCR1.SER */
+#define SPI_MIN_DIVIDER 1	/* Min. value for SPCR1.SER */
 
 #define TXx9_SPMCR		0x00
 #define TXx9_SPCR0		0x04
@@ -193,11 +195,8 @@ static void txx9spi_work_one(struct txx9spi *c, struct spi_message *m)
 
 		if (prev_speed_hz != speed_hz
 				|| prev_bits_per_word != bits_per_word) {
-			u32 n = (c->baseclk + speed_hz - 1) / speed_hz;
-			if (n < 1)
-				n = 1;
-			else if (n > 0xff)
-				n = 0xff;
+			int n = DIV_ROUND_UP(c->baseclk, speed_hz) - 1;
+			n = clamp(n, SPI_MIN_DIVIDER, SPI_MAX_DIVIDER);
 			/* enter config mode */
 			txx9spi_wr(c, mcr | TXx9_SPMCR_CONFIG | TXx9_SPMCR_BCLR,
 					TXx9_SPMCR);
@@ -370,8 +369,8 @@ static int __init txx9spi_probe(struct platform_device *dev)
 		goto exit;
 	}
 	c->baseclk = clk_get_rate(c->clk);
-	c->min_speed_hz = (c->baseclk + 0xff - 1) / 0xff;
-	c->max_speed_hz = c->baseclk;
+	c->min_speed_hz = DIV_ROUND_UP(c->baseclk, SPI_MAX_DIVIDER + 1);
+	c->max_speed_hz = c->baseclk / (SPI_MIN_DIVIDER + 1);
 
 	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 	if (!res)