msm8909+android5.1.1 由BLSP3改為BLSP1後SPI讀寫速度慢問題解決

msm8909+android5.1.1 由BLSP3改為BLSP1後SPI讀寫速度慢問題解決

發現SPI的讀寫速度慢了不少，msm8909-cb03.dtsi文件相關內容如下：

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，之前也改過這裡，但高通給的文檔是錯的。

qcom,bam-consumer-pipe-index =<4>;//<8>;
qcom,bam-producer-pipe-index =<5>;//<9>;