Troubleshooting • SD card overclock not working?

Code:

dtoverlay=sdhost,overclock_50=100dtparam=sd_overclock=100

Code:

root@fpi4:~# dtc -I fs /sys/firmware/devicetree/base 2>/dev/null | grep 'overclock.50\|sd.overclock'  -B12                        pinctrl-names = "default";                        pinctrl-0 = <0x31>;                        bus-width = <0x04>;                        non-removable;                        interrupts = <0x00 0x7e 0x04>;                        clocks = <0x08 0x1c>;                        dma-names = "rx-tx";                        compatible = "brcm,bcm2835-mmc\0brcm,bcm2835-sdhci";                        status = "disabled";                        reg = <0x7e300000 0x100>;                        phandle = <0x4d>;                        dmas = <0x0c 0x0b>;                        brcm,overclock-50 = <0x00>;--                mmc@7e202000 {                        bus-width = <0x04>;                        interrupts = <0x00 0x78 0x04>;                        clocks = <0x08 0x14>;                        brcm,pio-limit = <0x01>;                        dma-names = "rx-tx";                        compatible = "brcm,bcm2835-sdhost";                        status = "okay";                        firmware = <0x06>;                        reg = <0x7e202000 0x100>;                        phandle = <0x4b>;                        dmas = <0x0c 0x2000000d>;                        brcm,overclock-50 = <0x64>;--                mmc@7e300000 {                        pinctrl-names = "default";                        pinctrl-0 = <0x13>;                        bus-width = <0x04>;                        interrupts = <0x00 0x7e 0x04>;                        clocks = <0x08 0x1c>;                        dma-names = "rx-tx";                        compatible = "brcm,bcm2835-mmc\0brcm,bcm2835-sdhci";                        status = "disabled";                        reg = <0x7e300000 0x100>;                        phandle = <0x4c>;                        dmas = <0x0c 0x0b>;                        brcm,overclock-50 = <0x00>;--        zone_dma {                dma-ranges = <0x00 0x00 0x00 0x40000000>;                #address-cells = <0x01>;                #size-cells = <0x01>;        };        __overrides__ {                i2c1 = "\0\0\0Hstatus";                spi_dma4 = <0x46 0x646d6173 0x3a303d00 0x2e 0x46 0x646d6173 0x3a383d00 0x2e>;                cam1_reg_gpio = [00 00 00 53 67 70 69 6f 3a 34 00 00 00 00 53 67 70 69 6f 3a 30 3d 00 00 00 00 07];                drm_fb1_vc4 = "\0\0\0Odrm-fb1=\0/gpu";                random = "\0\0\0Jstatus";                sd_overclock = "\0\0\0Kbrcm,overclock-50:0";--                nvmem_cust_rw = "\0\0\0Wrw?";                sd_pio_limit = "\0\0\0Kbrcm,pio-limit:0";                cam0-led;                pwr_led_trigger = "\0\0\0[linux,default-trigger";                i2c_arm_baudrate = "\0\0\0Hclock-frequency:0";                pwr_led_activelow = "\0\0\0[gpios:8";                axiperf = "\0\0\0Nstatus";                strict_gpiod = "\0\0\0Tbootargs=pinctrl_bcm2835.persist_gpio_outputs=n";                uart1 = "\0\0\0Dstatus";                hdmi = "\0\0\0Ustatus\0\0\0\0Vstatus";                drm_fb0_vc4 = "\0\0\0Odrm-fb0=\0/gpu";                cam0_reg_gpio = [00 00 00 52 67 70 69 6f 3a 34 00 00 00 00 52 67 70 69 6f 3a 30 3d 00 00 00 00 07];                sdio_overclock = "\0\0\0Lbrcm,overclock-50:0\0\0\0\0Mbrcm,overclock-50:0";

Code:

root@fpi4:~# head /sys/kernel/debug/mmc0/{clock,ios}==> /sys/kernel/debug/mmc0/clock <==50000000==> /sys/kernel/debug/mmc0/ios <==clock:          50000000 Hzactual clock:   50000000 Hzvdd:            21 (3.3 ~ 3.4 V)bus mode:       2 (push-pull)chip select:    0 (don't care)power mode:     2 (on)bus width:      2 (4 bits)timing spec:    7 (sd uhs DDR50)signal voltage: 1 (1.80 V)driver type:    0 (driver type B)root@fpi4:~# dmesg | grep -i 'mmc\|sd\|overclock'[    1.639016] sdhci: Secure Digital Host Controller Interface driver[    1.639097] sdhci: Copyright(c) Pierre Ossman[    1.639371] sdhci-pltfm: SDHCI platform and OF driver helper[    1.673741] sdhost: log_buf @ 00000000a4453ccd (ee800000)[    1.728670] mmc2: sdhost-bcm2835 loaded - DMA enabled (>1)[    1.768797] mmc0: SDHCI controller on fe340000.mmc [fe340000.mmc] using ADMA[    1.866562] mmc0: new ultra high speed DDR50 SDXC card at address 0001[    1.867544] mmcblk0: mmc0:0001 GD4QT 119 GiB[    1.869977]  mmcblk0: p1 p2[    1.870345] mmcblk0: mmc0:0001 GD4QT 119 GiB[    2.662448] EXT4-fs (mmcblk0p2): mounted filesystem 93c89e92-8f2e-4522-ad32-68faed883d2f ro with ordered data mode. Quota mode: none.[    4.128352] EXT4-fs (mmcblk0p2): re-mounted 93c89e92-8f2e-4522-ad32-68faed883d2f r/w. Quota mode: none.

Code:

root@fpi4:~# lsb_release -aNo LSB modules are available.Distributor ID: DebianDescription:    Debian GNU/Linux 12 (bookworm)Release:        12Codename:       bookwormroot@fpi4:~# uname -aLinux fpi4 6.6.62+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.6.62-1+rpt1 (2024-11-25) aarch64 GNU/Linux