linux-kernel - RE: PATCH: rtsx_pci driver - don't disable the rts5229 card reader on Intel NUC boxes

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Date:   Tue, 4 Aug 2020 02:44:41 +0000
From:   吳昊澄 Ricky <ricky_wu@...ltek.com>
To:     Chris Clayton <chris2553@...glemail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "philquadra@...il.com" <philquadra@...il.com>,
        "Arnd Bergmann" <arnd@...db.de>
Subject: RE: PATCH: rtsx_pci driver - don't disable the rts5229 card reader on Intel NUC boxes

Hi Chris,

rtsx_pci_write_register(pcr, FPDTL, OC_POWER_DOWN, OC_POWER_DOWN);
This register operation saved power under 1mA, so if do not care the 1mA power we can have a patch to remove it, make compatible with NUC6
We tested others our card reader that remove it, we did not see any side effect 

Hi Greg k-h,

Do you have any comments? 

thanks

Ricky
> -----Original Message-----
> From: Chris Clayton [mailto:chris2553@...glemail.com]
> Sent: Monday, August 03, 2020 3:59 AM
> To: LKML; 吳昊澄 Ricky; gregkh@...uxfoundation.org; rdunlap@...radead.org;
> philquadra@...il.com; Arnd Bergmann
> Subject: Re: PATCH: rtsx_pci driver - don't disable the rts5229 card reader on
> Intel NUC boxes
> 
> Sorry, I should have said that the patch is against 5.7.12. It applies to upstream,
> but with offsets.
> 
> On 02/08/2020 20:48, Chris Clayton wrote:
> > bede03a579b3 introduced a bug which leaves the rts5229 PCI Express card
> reader on my Intel NUC6CAYH box.
> >
> > The bug is in drivers/misc/cardreader/rtsx_pcr.c. A call to rtsx_pci_init_ocp()
> was added to rtsx_pci_init_hw().
> > At the call point, pcr->ops->init_ocp is NULL and pcr->option.ocp_en is 0, so in
> rtsx_pci_init_ocp() the cardreader
> > gets disabled.
> >
> > I've avoided this by making excution code that results in the reader being
> disabled conditional on the device
> > not being an RTS5229. Of course, other rtsxxx card readers may also be
> disabled by this bug. I don't have the
> > knowledge to address that, so I'll leave to the driver maintainers.
> >
> > The patch to avoid the bug is attached.
> >
> > Fixes: bede03a579b3 ("misc: rtsx: Enable OCP for rts522a rts524a rts525a
> rts5260")
> > Link: https://marc.info/?l=linux-kernel&m=159105912832257
> > Link: https://bugzilla.kernel.org/show_bug.cgi?id=204003
> > Signed-off-by: Chris Clayton <chris2553@...glemail.com>
> >
> > bede03a579b3 introduced a bug which leaves the rts5229 PCI Express card
> reader on my Intel NUC6CAYH box.
> >
> > The bug is in drivers/misc/cardreader/rtsx_pcr.c. A call to rtsx_pci_init_ocp()
> was added to rtsx_pci_init_hw().
> > At the call point, pcr->ops->init_ocp is NULL and pcr->option.ocp_en is 0, so in
> rtsx_pci_init_ocp() the cardreader
> > gets disabled.
> >
> > I've avoided this by making excution code that results in the reader being
> disabled conditional on the device
> > not being an RTS5229. Of course, other rtsxxx card readers may also be
> disabled by this bug. I don't have the
> > knowledge to address that, so I'll leave to the driver maintainers.
> >
> > The patch to avoid the bug is attached.
> >
> > Chris
> >
> 
> ------Please consider the environment before printing this e-mail.