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From: "吳昊澄 Ricky" <ricky_wu@realtek.com>
To: Chris Clayton <chris2553@googlemail.com>,
	LKML <linux-kernel@vger.kernel.org>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	"rdunlap@infradead.org" <rdunlap@infradead.org>,
	"philquadra@gmail.com" <philquadra@gmail.com>,
	"Arnd Bergmann" <arnd@arndb.de>
Subject: RE: PATCH: rtsx_pci driver - don't disable the rts5229 card reader on Intel NUC boxes
Date: Tue, 4 Aug 2020 02:44:41 +0000
Message-ID: <5729c72bbc2740d3917619c85e2fde58@realtek.com> (raw)
In-Reply-To: <a9a94d7f-4873-7a10-4911-f3c760257c5c@googlemail.com>

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@googlemail.com]
> Sent: Monday, August 03, 2020 3:59 AM
> To: LKML; 吳昊澄 Ricky; gregkh@linuxfoundation.org; rdunlap@infradead.org;
> philquadra@gmail.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@googlemail.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.

  parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-02 19:48 Chris Clayton
2020-08-02 19:58 ` Chris Clayton
2020-08-03  3:01   ` 吳昊澄 Ricky
2020-08-03  5:27     ` Chris Clayton
2020-08-04  2:44   ` 吳昊澄 Ricky [this message]
2020-08-04  7:48     ` gregkh
2020-08-04  8:08       ` 吳昊澄 Ricky
2020-08-04  8:13         ` gregkh
2020-08-04  8:50         ` Chris Clayton
2020-08-04 10:46           ` 吳昊澄 Ricky
2020-08-04 11:51             ` Chris Clayton
2020-08-05  2:35               ` 吳昊澄 Ricky
2020-08-05  5:51                 ` Chris Clayton
2020-08-05 12:48                   ` Chris Clayton
2020-08-22  7:24                     ` Chris Clayton

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