From: Mark Brown <broonie@kernel.org>
Date: Fri, 3 Oct 2014 15:33:41 +0000 (+0100)
Subject: Merge remote-tracking branches 'spi/topic/fsl-dspi', 'spi/topic/imx', 'spi/topic... 
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=899d81b974ec7b3fd0f875c578bd91e89212742f;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

Merge remote-tracking branches 'spi/topic/fsl-dspi', 'spi/topic/imx', 'spi/topic/mxs', 'spi/topic/omap-100k' and 'spi/topic/orion' into spi-next
---

899d81b974ec7b3fd0f875c578bd91e89212742f
diff --cc drivers/spi/spi-orion.c
index 345e7d61c399,c4675fa8b645,c4675fa8b645,c4675fa8b645,c4675fa8b645,acf8e48db16c..835cdda6f4f5
--- a/drivers/spi/spi-orion.c
+++ b/drivers/spi/spi-orion.c
@@@@@@@ -88,25 -88,25 -88,25 -88,25 -88,25 -105,59 +105,59 @@@@@@@ static int orion_spi_baudrate_set(struc
      
      	tclk_hz = clk_get_rate(orion_spi->clk);
      
----- 	/*
----- 	 * the supported rates are: 4,6,8...30
----- 	 * round up as we look for equal or less speed
----- 	 */
----- 	rate = DIV_ROUND_UP(tclk_hz, speed);
----- 	rate = roundup(rate, 2);
+++++ 	if (devdata->typ == ARMADA_SPI) {
+++++ 		unsigned int clk, spr, sppr, sppr2, err;
+++++ 		unsigned int best_spr, best_sppr, best_err;
+     
 ---- 	/* check if requested speed is too small */
 ---- 	if (rate > 30)
 ---- 		return -EINVAL;
+++++ 		best_err = speed;
+++++ 		best_spr = 0;
+++++ 		best_sppr = 0;
+     
 ---- 	if (rate < 4)
 ---- 		rate = 4;
+++++ 		/* Iterate over the valid range looking for best fit */
+++++ 		for (sppr = 0; sppr < 8; sppr++) {
+++++ 			sppr2 = 0x1 << sppr;
+++++ 
+++++ 			spr = tclk_hz / sppr2;
+++++ 			spr = DIV_ROUND_UP(spr, speed);
+++++ 			if ((spr == 0) || (spr > 15))
+++++ 				continue;
 ++++ 
-     	/* check if requested speed is too small */
-     	if (rate > 30)
-     		return -EINVAL;
+++++ 			clk = tclk_hz / (spr * sppr2);
+++++ 			err = speed - clk;
 ++++ 
-     	if (rate < 4)
-     		rate = 4;
+++++ 			if (err < best_err) {
+++++ 				best_spr = spr;
+++++ 				best_sppr = sppr;
+++++ 				best_err = err;
+++++ 			}
+++++ 		}
+     
 ---- 	/* Convert the rate to SPI clock divisor value.	*/
 ---- 	prescale = 0x10 + rate/2;
+++++ 		if ((best_sppr == 0) && (best_spr == 0))
+++++ 			return -EINVAL;
+++++ 
+++++ 		prescale = ((best_sppr & 0x6) << 5) |
+++++ 			((best_sppr & 0x1) << 4) | best_spr;
+++++ 	} else {
+++++ 		/*
+++++ 		 * the supported rates are: 4,6,8...30
+++++ 		 * round up as we look for equal or less speed
+++++ 		 */
+++++ 		rate = DIV_ROUND_UP(tclk_hz, speed);
+++++ 		rate = roundup(rate, 2);
+++++ 
+++++ 		/* check if requested speed is too small */
+++++ 		if (rate > 30)
+++++ 			return -EINVAL;
 ++++ 
-     	/* Convert the rate to SPI clock divisor value.	*/
-     	prescale = 0x10 + rate/2;
+++++ 		if (rate < 4)
+++++ 			rate = 4;
+++++ 
+++++ 		/* Convert the rate to SPI clock divisor value.	*/
+++++ 		prescale = 0x10 + rate/2;
+++++ 	}
      
      	reg = readl(spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
----- 	reg = ((reg & ~ORION_SPI_CLK_PRESCALE_MASK) | prescale);
+++++ 	reg = ((reg & ~devdata->prescale_mask) | prescale);
      	writel(reg, spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
      
      	return 0;