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mb/google/cherry: Improve boot time by raising little CPU frequency 

Raise little CPU to 2GHz at romstage to improve boot time by about
100 ms.

BUG=b:195274787

Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: Id6aac8f9db86a6c1e61ea94863f2cbde12c0482e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56844
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.corp-partner.google.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
This commit is contained in:
Rex-BC Chen 2021-08-04 11:00:53 +08:00 committed by Hung-Te Lin
parent 55c98c368c
commit 257eb1354e
1 changed files with 12 additions and 0 deletions
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12
src/mainboard/google/cherry/romstage.c
View File

@ -1,21 +1,33 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <arch/stages.h>
#include <delay.h>
#include <soc/clkbuf.h>
#include <soc/emi.h>
#include <soc/i2c.h>
#include <soc/mt6315.h>
#include <soc/mt6359p.h>
#include <soc/mt6360.h>
#include <soc/pll_common.h>
#include <soc/pmif.h>
#include <soc/rtc.h>
#include <soc/scp.h>
static void raise_little_cpu_freq(void)
{
mt6359p_buck_set_voltage(MT6359P_SRAM_PROC1, 1000 * 1000);
mt6359p_buck_set_voltage(MT6359P_CORE, 1000 * 1000);
udelay(200);
mt_pll_raise_little_cpu_freq(2000 * MHz);
mt_pll_raise_cci_freq(1385 * MHz);
}
void platform_romstage_main(void)
{
mtk_pmif_init();
mt6359p_init();
mt6315_init();
raise_little_cpu_freq();
mtk_i2c_bus_init(I2C7);
if (CONFIG(BOARD_GOOGLE_CHERRY))
mt6360_init(I2C7);