Hung-Te Lin has submitted this change. ( https://review.coreboot.org/c/coreboot/+/56844 )
Change subject: mb/google/cherry: Improve boot time by raising little CPU frequency ......................................................................
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 --- M src/mainboard/google/cherry/romstage.c 1 file changed, 12 insertions(+), 0 deletions(-)
Approvals: build bot (Jenkins): Verified Yu-Ping Wu: Looks good to me, approved Rex-BC Chen: Looks good to me, but someone else must approve
diff --git a/src/mainboard/google/cherry/romstage.c b/src/mainboard/google/cherry/romstage.c index c11fef4..71291c2 100644 --- a/src/mainboard/google/cherry/romstage.c +++ b/src/mainboard/google/cherry/romstage.c @@ -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);