SPI 速度优化，提升DDR 频率+CPU频率
MTK SPI 速度优化，提升DDR 频率+CPU频率
是指VCORE ddr的改动.
一、Kernel的接口拉CPU频率，可以使用接口：
/kernel-4.4/drivers/misc/mediatek/include/mt-plat/mt6758/include/mach/mtk_ppm_api.h
extern void mt_ppm_sysboost_freq(enum ppm_sysboost_user user, unsigned int freq);
目前UT是预留出来的.
//引入头文件
#include "mach/mtk_ppm_api.h"
//request:mt_ppm_sysboost_freq(BOOST_BY_UT,2340000);
//release：mt_ppm_sysboost_freq(BOOST_BY_UT, 0);
获取CPU的频率:可以读一下节点：大核：cat /proc/cpufreq/MT_CPU_DVFS_L/cpufreq
小核：
cat /proc/cpufreq/MT_CPU_DVFS_LL/cpufreq
二、在下面两只文件加入高亮的部分drivers/misc/mediatek/base/power/include/vcorefs_v3/mtk_vcorefs_governor.h@@ -52,6 +52,7 @@ enum dvfs_kicker { KIR_BOOTUP, KIR_FBT, KIR_WIFI, KIR_SPI, KIR_SYSFS, KIR_MM_NON_FORCE, KIR_SYSFS_N,drivers/misc/mediatek/base/power/vcorefs_v3/mtk_vcorefs_governor.c@@ -147,6 +147,7 @@ static char *kicker_name[] = { "KIR_BOOTUP", "KIR_FBT", "KIR_WIFI", "KIR_SPI", "KIR_SYSFS", "KIR_MM_NON_FORCE", "KIR_SYSFS_N",
需要加入头文件
#include
api: int vcorefs_request_dvfs_opp(enum dvfs_kicker kicker, enum dvfs_opp opp)
parameters:
1) kicer: KIR_SPI
2) opp:
OPP_0 for 3200/0.8V
OPP_1 for 2667/0.7V
OPP_2 for 1600/0.7V
OPP_UNREQ for release request
e.g.
1.//request dvfs floor to 3200
vcorefs_request_dvfs_opp(KIR_WIFI, OPP_0);
2.//release request
vcorefs_request_dvfs_opp(KIR_WIFI, OPP_UNREQ );
enum dvfs_opp {
OPP_UNREQ = -1,
OPP_0 = 0,
OPP_1,
OPP_2,
NUM_OPP,
};
Note1: 因為 api內用到mutex, 外層不能用spinlock. 且要能允許sleep
Note2: 有request, 請一定要有 un-request, 不然有可能拉住系統最低檔位, 造成power issue.
Vcore读频率：
Cat /sys/power/vcorefs/vcore_debug
下面的数值变成0
sw_opp: 0
高通SPI频率，只能在数组中选：
static struct clk_freq_tbl ftbl_blsp_spi_apps_clk_src[] = {
F( 960000, xo, 10, 1, 2),
F( 4800000, xo, 4, 0, 0),
F( 9600000, xo, 2, 0, 0),
F( 12500000, gpll0_main_div2, 16, 1, 2),
F( 16000000, gpll0, 10, 1, 5),
F( 19200000, xo, 1, 0, 0),
F( 25000000, gpll0, 16, 1, 2),
F( 50000000, gpll0, 16, 0, 0),
F_END
};