rockchip: clk: update dwmmc clock div

dwmmc controller has default internal divider by 2,
and we always provide double of the clock rate request by
dwmmc controller. Sync code for all Rockchip SoC with:
4055b46 rockchip: clk: rk3288: fix mmc clock setting

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
[fixup for 'missing DIV_ROUND_UP' conflict for clk_rk3288.c:]
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

drivers/clk/rockchip/clk_rk3036.c

@@ -235,7 +235,7 @@ static ulong rockchip_mmc_get_clk(struct rk3036_cru *cru, uint clk_general_rate,
 	}
 
 	src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
-	return DIV_TO_RATE(src_rate, div);
+	return DIV_TO_RATE(src_rate, div) / 2;
 }
 
 static ulong rockchip_mmc_set_clk(struct rk3036_cru *cru, uint clk_general_rate,
@@ -247,10 +247,10 @@ static ulong rockchip_mmc_set_clk(struct rk3036_cru *cru, uint clk_general_rate,
 	debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
 
 	/* mmc clock auto divide 2 in internal */
-	src_clk_div = (clk_general_rate / 2 + freq - 1) / freq;
+	src_clk_div = DIV_ROUND_UP(clk_general_rate / 2, freq);
 
 	if (src_clk_div > 0x7f) {
-		src_clk_div = (OSC_HZ / 2 + freq - 1) / freq;
+		src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, freq);
 		mux = EMMC_SEL_24M;
 	} else {
 		mux = EMMC_SEL_GPLL;

drivers/clk/rockchip/clk_rk3188.c

@@ -287,7 +287,7 @@ static ulong rockchip_mmc_get_clk(struct rk3188_cru *cru, uint gclk_rate,
 		return -EINVAL;
 	}
 
-	return DIV_TO_RATE(gclk_rate, div);
+	return DIV_TO_RATE(gclk_rate, div) / 2;
 }
 
 static ulong rockchip_mmc_set_clk(struct rk3188_cru *cru, uint gclk_rate,
@@ -296,7 +296,8 @@ static ulong rockchip_mmc_set_clk(struct rk3188_cru *cru, uint gclk_rate,
 	int src_clk_div;
 
 	debug("%s: gclk_rate=%u\n", __func__, gclk_rate);
-	src_clk_div = RATE_TO_DIV(gclk_rate, freq);
+	/* mmc clock defaulg div 2 internal, need provide double in cru */
+	src_clk_div = DIV_ROUND_UP(gclk_rate / 2, freq);
 	assert(src_clk_div <= 0x3f);
 
 	switch (periph) {

drivers/clk/rockchip/clk_rk322x.c

@@ -239,7 +239,7 @@ static ulong rockchip_mmc_get_clk(struct rk322x_cru *cru, uint clk_general_rate,
 	}
 
 	src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
-	return DIV_TO_RATE(src_rate, div);
+	return DIV_TO_RATE(src_rate, div) / 2;
 }
 
 static ulong rockchip_mmc_set_clk(struct rk322x_cru *cru, uint clk_general_rate,
@@ -250,11 +250,11 @@ static ulong rockchip_mmc_set_clk(struct rk322x_cru *cru, uint clk_general_rate,
 
 	debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
 
-	/* mmc clock auto divide 2 in internal */
-	src_clk_div = (clk_general_rate / 2 + freq - 1) / freq;
+	/* mmc clock defaulg div 2 internal, need provide double in cru */
+	src_clk_div = DIV_ROUND_UP(clk_general_rate / 2, freq);
 
 	if (src_clk_div > 0x7f) {
-		src_clk_div = (OSC_HZ / 2 + freq - 1) / freq;
+		src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, freq);
 		mux = EMMC_SEL_24M;
 	} else {
 		mux = EMMC_SEL_GPLL;

drivers/clk/rockchip/clk_rk3288.c

@@ -530,10 +530,11 @@ static ulong rockchip_mmc_set_clk(struct rk3288_cru *cru, uint gclk_rate,
 	int mux;
 
 	debug("%s: gclk_rate=%u\n", __func__, gclk_rate);
-	src_clk_div = RATE_TO_DIV(gclk_rate, freq);
+	/* mmc clock default div 2 internal, need provide double in cru */
+	src_clk_div = DIV_ROUND_UP(gclk_rate / 2, freq);
 
 	if (src_clk_div > 0x3f) {
-		src_clk_div = RATE_TO_DIV(OSC_HZ, freq);
+		src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, freq);
 		mux = EMMC_PLL_SELECT_24MHZ;
 		assert((int)EMMC_PLL_SELECT_24MHZ ==
 		       (int)MMC0_PLL_SELECT_24MHZ);

drivers/clk/rockchip/clk_rk3328.c

@@ -412,9 +412,9 @@ static ulong rk3328_mmc_get_clk(struct rk3328_cru *cru, uint clk_id)
 
 	if ((con & CLK_EMMC_PLL_MASK) >> CLK_EMMC_PLL_SHIFT
 	    == CLK_EMMC_PLL_SEL_24M)
-		return DIV_TO_RATE(OSC_HZ, div);
+		return DIV_TO_RATE(OSC_HZ, div) / 2;
 	else
-		return DIV_TO_RATE(GPLL_HZ, div);
+		return DIV_TO_RATE(GPLL_HZ, div) / 2;
 }
 
 static ulong rk3328_mmc_set_clk(struct rk3328_cru *cru,
@@ -436,11 +436,12 @@ static ulong rk3328_mmc_set_clk(struct rk3328_cru *cru,
 		return -EINVAL;
 	}
 	/* Select clk_sdmmc/emmc source from GPLL by default */
-	src_clk_div = GPLL_HZ / set_rate;
+	/* mmc clock defaulg div 2 internal, need provide double in cru */
+	src_clk_div = DIV_ROUND_UP(GPLL_HZ / 2, set_rate);
 
 	if (src_clk_div > 127) {
 		/* use 24MHz source for 400KHz clock */
-		src_clk_div = OSC_HZ / set_rate;
+		src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, set_rate);
 		rk_clrsetreg(&cru->clksel_con[con_id],
 			     CLK_EMMC_PLL_MASK | CLK_EMMC_DIV_CON_MASK,
 			     CLK_EMMC_PLL_SEL_24M << CLK_EMMC_PLL_SHIFT |

drivers/clk/rockchip/clk_rk3399.c

@@ -750,18 +750,21 @@ static ulong rk3399_mmc_get_clk(struct rk3399_cru *cru, uint clk_id)
 	case HCLK_SDMMC:
 	case SCLK_SDMMC:
 		con = readl(&cru->clksel_con[16]);
+		/* dwmmc controller have internal div 2 */
+		div = 2;
 		break;
 	case SCLK_EMMC:
 		con = readl(&cru->clksel_con[21]);
+		div = 1;
 		break;
 	default:
 		return -EINVAL;
 	}
-	div = (con & CLK_EMMC_DIV_CON_MASK) >> CLK_EMMC_DIV_CON_SHIFT;
 
+	div *= (con & CLK_EMMC_DIV_CON_MASK) >> CLK_EMMC_DIV_CON_SHIFT;
 	if ((con & CLK_EMMC_PLL_MASK) >> CLK_EMMC_PLL_SHIFT
 			== CLK_EMMC_PLL_SEL_24M)
-		return DIV_TO_RATE(24*1000*1000, div);
+		return DIV_TO_RATE(OSC_HZ, div);
 	else
 		return DIV_TO_RATE(GPLL_HZ, div);
 }
@@ -776,11 +779,12 @@ static ulong rk3399_mmc_set_clk(struct rk3399_cru *cru,
 	case HCLK_SDMMC:
 	case SCLK_SDMMC:
 		/* Select clk_sdmmc source from GPLL by default */
-		src_clk_div = GPLL_HZ / set_rate;
+		/* mmc clock defaulg div 2 internal, provide double in cru */
+		src_clk_div = DIV_ROUND_UP(GPLL_HZ / 2, set_rate);
 
 		if (src_clk_div > 127) {
 			/* use 24MHz source for 400KHz clock */
-			src_clk_div = 24*1000*1000 / set_rate;
+			src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, set_rate);
 			rk_clrsetreg(&cru->clksel_con[16],
 				     CLK_EMMC_PLL_MASK | CLK_EMMC_DIV_CON_MASK,
 				     CLK_EMMC_PLL_SEL_24M << CLK_EMMC_PLL_SHIFT |