sh: always enable sh7724 vpu_clk and set to 166MHz on Ecovec

Update the sh7724 processor code to always enable vpu_clk.

On the Ecovec board, set the vpu_clk to 166 Mhz.

The 166MHz setting results in a divide-by-6 setup for
vpu_clk and improves the VPU performance compared to the
power-on-reset/bootloader configuration.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/boards/mach-ecovec24/setup.c

@@ -1121,6 +1121,11 @@ static int __init arch_setup(void)
 	gpio_request(GPIO_FN_INTC_IRQ1, NULL);
 	gpio_direction_input(GPIO_FN_INTC_IRQ1);
 
+	/* set VPU clock to 166 MHz */
+	clk = clk_get(NULL, "vpu_clk");
+	clk_set_rate(clk, clk_round_rate(clk, 166000000));
+	clk_put(clk);
+
 	/* enable I2C device */
 	i2c_register_board_info(0, i2c0_devices,
 				ARRAY_SIZE(i2c0_devices));

arch/sh/kernel/cpu/sh4a/clock-sh7724.c

@@ -159,7 +159,7 @@ struct clk div4_clks[DIV4_NR] = {
 	[DIV4_SH] = DIV4("shyway_clk", FRQCRA, 12, 0x2f7c, CLK_ENABLE_ON_INIT),
 	[DIV4_B] = DIV4("bus_clk", FRQCRA, 8, 0x2f7c, CLK_ENABLE_ON_INIT),
 	[DIV4_P] = DIV4("peripheral_clk", FRQCRA, 0, 0x2f7c, 0),
-	[DIV4_M1] = DIV4("vpu_clk", FRQCRB, 4, 0x2f7c, 0),
+	[DIV4_M1] = DIV4("vpu_clk", FRQCRB, 4, 0x2f7c, CLK_ENABLE_ON_INIT),
 };
 
 struct clk div6_clks[] = {