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rockchip: rk3188: Setup the armclk in spl

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The armclk starts in slow mode (24MHz) on the rk3188, which results in U-Boot
startup taking a lot of time (U-Boot itself, but also the rc4 decoding done
in the bootrom).

With default pmic settings we can always reach a safe frequency of 600MHz
which is also the frequency the proprietary loader left the armclk at,
without needing access to the systems pmic.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Heiko Stübner 2017-03-20 12:40:33 +01:00 • committed by Simon Glass
parent f785357073
commit f4f57c58b5
1 changed files with 24 additions and 0 deletions
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24
arch/arm/mach-rockchip/rk3188-board-spl.c
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@ -4,6 +4,7 @@
* SPDX-License-Identifier: GPL-2.0+ * SPDX-License-Identifier: GPL-2.0+
*/ */
#include <clk.h>
#include <common.h> #include <common.h>
#include <debug_uart.h> #include <debug_uart.h>
#include <dm.h> #include <dm.h>
@ -76,6 +77,27 @@ u32 spl_boot_mode(const u32 boot_device)
return MMCSD_MODE_RAW; return MMCSD_MODE_RAW;
} }
static int setup_arm_clock(void)
{
struct udevice *dev;
struct clk clk;
int ret;
ret = rockchip_get_clk(&dev);
if (ret)
return ret;
clk.id = CLK_ARM;
ret = clk_request(dev, &clk);
if (ret < 0)
return ret;
ret = clk_set_rate(&clk, 600000000);
clk_free(&clk);
return ret;
}
void board_init_f(ulong dummy) void board_init_f(ulong dummy)
{ {
struct udevice *pinctrl, *dev; struct udevice *pinctrl, *dev;
@ -144,6 +166,8 @@ void board_init_f(ulong dummy)
return; return;
} }
setup_arm_clock();
#if defined(CONFIG_ROCKCHIP_SPL_BACK_TO_BROM) && !defined(CONFIG_SPL_BOARD_INIT) #if defined(CONFIG_ROCKCHIP_SPL_BACK_TO_BROM) && !defined(CONFIG_SPL_BOARD_INIT)
back_to_bootrom(); back_to_bootrom();
#endif #endif