eSDHC controller driver on MPC8308rdb

[Tonyliu]

Maria Johansen wrote:
> Hello,
> (apologies for writing such a long e-mail, hope you can bother to read it all ☺ )
> I have some difficulties with the eSDHC controller driver used on a MPC8308 evaluation board with kernel 2.6.36-rc7, and hope that some of you may be able to help me with the debugging. 
>
> The driver is loaded properly, and binds to the eSDHC controller without problems. When inserting a sd-card it is bound to the  mmcblk-driver, so no problems there either.  
>
> However, I am not able to read nor write to the card, I have attached output with error messages below:
>
> **********************************************************
> mmc0: new SDHC card at address 9155
> mmcblk0: mmc0:9155 SD04G 3.69 GiB
> mmc0: Too large timeout requested!
> mmcblk0: retrying using single block read
> mmc0: Too large timeout requested!
> mmcblk0: error -84 sending status comand
> mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
> end_request: I/O error, dev mmcblk0, sector 0
> mmc0: Too large timeout requested!
> mmcblk0: error -84 sending status comand
> mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
> end_request: I/O error, dev mmcblk0, sector 1
> …..<this continues up to sector 7 before starting anew>
>
> Debug output with no SD-card:
> **********************************************************
> mmc0: clock 0Hz busmode 1 powermode 1 cs 0 Vdd 20 width 0 timing 0
> mmc0: clock 400000Hz busmode 1 powermode 2 cs 0 Vdd 20 width 0 timing 0
> of:sdhci-of e002e000.sdhci: desired SD clock: 400000, actual: 0
> mmc0: starting CMD52 arg 00000c00 flags 00000195
> sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00010001
> mmc0: req done (CMD52): -110: 00000000 00000000 00000000 00000000
> mmc0: starting CMD52 arg 80000c08 flags 00000195
> sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00010001
> mmc0: req done (CMD52): -110: 00000000 00000000 00000000 00000000
> mmc0: clock 400000Hz busmode 1 powermode 2 cs 1 Vdd 20 width 0 timing 0
> mmc0: starting CMD0 arg 00000000 flags 000000c0
> sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001
> mmc0: req done (CMD0): 0: 00000000 00000000 00000000 00000000
> mmc0: clock 400000Hz busmode 1 powermode 2 cs 0 Vdd 20 width 0 timing 0
> mmc0: starting CMD8 arg 000001aa flags 000002f5
> sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00010001
> mmc0: req done (CMD8): -110: 00000000 00000000 00000000 00000000
> mmc0: starting CMD5 arg 00000000 flags 000002e1
> sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00010001
> mmc0: req failed (CMD5): -110, retrying...
> sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00010001
> mmc0: req failed (CMD5): -110, retrying...
> sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00010001
> mmc0: req failed (CMD5): -110, retrying...
> …
>
> I have the following in my dts:
>        sdhci at 2e000 {
> 		compatible = "fsl,mpc8308-esdhc", "fsl,esdhc";
> 		reg = <0x2e000 0x1000>;
> 		interrupts = <42 0x8>;
> 		interrupt-parent = <&ipic>;
> 		clock-frequency = <0>;
> 	};
>
>
> Could this be a problem related the eSDHC controller (or the driver), or is it the memory card? (a 4GB SanDisk Extreme SDHC card, which unfortunately is the only card I have available at the moment.)
> I will keep digging into drivers/mmc/host/sdhci.c in search of a solution, and any tips to how I should proceed would be greatly appreciated!
>   
Hi,
Try the patch in attatchment. By default, on some e300 platforms such as 
mpc8308_rdb, the entry "clock-frequency" of section sdchi in DTB is not 
fixed by u-boot, so has to caculate the input clock for sdhci controller 
explicitly in driver.

Tony
> --
> Maria 
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> https://lists.ozlabs.org/listinfo/linuxppc-dev


-- 
Tony Liu | Liu Bo
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