On 24/08/16 01:14, Zach Brown wrote: > On Tue, Aug 23, 2016 at 09:22:29AM +0300, Adrian Hunter wrote: >> On 23/08/16 01:55, Zach Brown wrote: >>> From: Jaeden Amero <jaeden.amero@xxxxxx> >>> >>> On some devices, CD is broken so that we must force the SDHCI into test >>> mode and set CD, so that it always detects an SD card as present. >>> >>> In order to get a device with broken CD working, we had previously >>> always set the SDHCI into test mode. Unfortunately, this had the side >>> effect of making all SD cards used with our Linux kernels undetectable >>> and non-removable. >>> >>> By making this "SD test mode" setting optional via a quirk, we can avoid >>> this side effect for devices other than the device with broken CD. >>> Additionally, we add a device parameter to sdhci-pltfm to allow all >>> SDHCI drivers to enable this quirk. >> >> Generally new quirks are not acceptable, but I don't see how test mode helps >> very much since you still don't get any card detection events. If you >> really need test mode, please explain more about how it helps (as opposed to >> polling for example). >> >> > > Polling doesnt work in our case, since the issue lies with the SD controller > itself. The SD controller in xilinx zynq devices requires the CDn signal to > work. http://www.xilinx.com/support/answers/61064.html We have a situation > where the controller requires the signal, but we can't use any of our pins to > supply it. With test mode we can get the controller into a state where it works > despite not having the signal. > Doesn't sound like something we need in sdhci.c. Have you considered adding it to the driver, perhaps using the ->reset() callback? -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
