网友通过本文主要向大家介绍了msm8909,高通msm8909,msm8909处理器,msm8909与msm8916,高通骁龙msm8909等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
msm8909+android5.1.1 由BLSP3改为BLSP1后SPI读写速度慢问题解决
msm8909+android5.1.1 由BLSP3改为BLSP1后SPI读写速度慢问题解决
发现SPI的读写速度慢了不少，msm8909-cb03.dtsi文件相关内容如下：
spi_0: spi@78b5000 { /* BLSP1 QUP1 */
compatible ="qcom,spi-qup-v2";
#address-cells = <1>;
#size-cells = <0>;
reg-names ="spi_physical", "spi_bam_physical";
reg = <0x78b5000 0x600>,
<0x7884000 0x23000>;
interrupt-names ="spi_irq", "spi_bam_irq";
interrupts = <0 95 0>,<0 238 0>;
spi-max-frequency =<19200000>;
pinctrl-names ="spi_default", "spi_sleep";
pinctrl-0 =<&spi0_default &spi0_cs0_active>;
pinctrl-1 = <&spi0_sleep&spi0_cs0_sleep>;
clocks = <&clock_gccclk_gcc_blsp1_ahb_clk>,
<&clock_gccclk_gcc_blsp1_qup1_spi_apps_clk>;
clock-names ="iface_clk", "core_clk";
qcom,infinite-mode = <0>;
qcom,use-bam;
qcom,use-pinctrl;
qcom,ver-reg-exists;
qcom,bam-consumer-pipe-index =<8>;
qcom,bam-producer-pipe-index =<9>;
qcom,master-id = <86>;
};
改成下面的pipe就OK了，之前也改过这里，但高通给的文档是错的。
qcom,bam-consumer-pipe-index =<4>;//<8>; qcom,bam-producer-pipe-index =<5>;//<9>;