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    SubjectRe: [PATCH 3/3] mmc: rtsx: Add SD Express mode support for RTS5261
    On Fri, Oct 23, 2020 at 10:02:15AM +0200, Ulf Hansson wrote:
    > > > Is there no mechanism to support read-only PCIe/NVMe based storage devices?
    > > > If that is the case, maybe it's simply better to not support the readonly option
    > > > at all for SD express cards?
    > > >
    > > I think there's no mechanism to support read-only PCIe/NVMe based storage devices.
    >
    > I have looped in Christoph, maybe he can give us his opinion on this.

    NVMe namespaces can have a bunch of 'write protection' modes advertised
    by the controller, which Linux respects. The controller in this case would
    be part of the SD-Card. IMHO it is a quality of implementation issue
    of the SD-Card/Controller to have the the write protection mode of the
    namespace(s) match that of the SD interface, and the SD card spec should
    talk about that if it doesn't already.

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