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From: "吳昊澄 Ricky" <ricky_wu@realtek.com>
To: Chris Clayton <chris2553@googlemail.com>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>
Cc: LKML <linux-kernel@vger.kernel.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: Wed, 5 Aug 2020 02:35:52 +0000
Message-ID: <e1c295f28e3d4bdd8c78dfd3a5ed398c@realtek.com> (raw)
In-Reply-To: <152ef6c0-f3c0-bb67-4175-adced3c720cd@googlemail.com>



> -----Original Message-----
> From: Chris Clayton [mailto:chris2553@googlemail.com]
> Sent: Tuesday, August 04, 2020 7:52 PM
> To: 吳昊澄 Ricky; gregkh@linuxfoundation.org
> Cc: LKML; 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
> 
> 
> 
> On 04/08/2020 11:46, 吳昊澄 Ricky wrote:
> >> -----Original Message-----
> >> From: Chris Clayton [mailto:chris2553@googlemail.com]
> >> Sent: Tuesday, August 04, 2020 4:51 PM
> >> To: 吳昊澄 Ricky; gregkh@linuxfoundation.org
> >> Cc: LKML; 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
> >>
> >>
> >>
> >> On 04/08/2020 09:08, 吳昊澄 Ricky wrote:
> >>>> -----Original Message-----
> >>>> From: gregkh@linuxfoundation.org [mailto:gregkh@linuxfoundation.org]
> >>>> Sent: Tuesday, August 04, 2020 3:49 PM
> >>>> To: 吳昊澄 Ricky
> >>>> Cc: Chris Clayton; LKML; 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
> >>>>
> >>>> On Tue, Aug 04, 2020 at 02:44:41AM +0000, 吳昊澄 Ricky wrote:
> >>>>> 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?
> >>>>
> >>>> comments on what?  I don't know what you are responding to here, sorry.
> >>>>
> >>> Can we have a patch to kernel for NUC6? It may cause more power(1mA) but
> it
> >> will have more compatibility
> >>>
> >>
> >> Ricky,
> >>
> >> I don't understand why you want to completely remove the code that sets up
> the
> >> 1mA power saving. That code was there
> >> even before your patch (bede03a579b3b4a036003c4862cc1baa4ddc351f), so I
> >> assume it benefits some of the Realtek card
> >> readers. Before your patch however, rtsx_pci_init_ocp() was not called for the
> >> rts5229 reader, but the patch introduced
> >> an unconditional call to that function into rtsx_pci_init_hw(), which is run for
> the
> >> rts5229. That is what now disables
> >> the card reader.
> >>
> >> Now, I don't know whether other cards are affected, although I don't recall
> >> seeing any reported as I searched the kernel
> >> and ubuntu bugzillas for any analysis of the problem. I know this is not what
> the
> >> patch I sent does, but having thought
> >> about it more, seems to me that the simplest fix is to skip the new call to
> >> rtsx_pci_init_ocp() if the reader is an rts5229.
> >>
> >
> > Because we are thinking about if others our card reader that not belong A
> series(my ocp patch coverage) also on NUC6 platform maybe have the same
> problem...
> >
> 
> OK. What if we do make the new call but only for the card readers that are in the
> A series? Are they the ones that have
> PID_5nnn defines in include/linux/rtsx_pci.h? Or is there another simple way of
> identifying that a reader is a member of
> the A series?
> 
> I'm thinking of something like:
> static bool rtsx_pci_is_series_A(pcr)
> {
> 	unsigned short device = pcr->pci->device;
> 
> 	return device == PID524A || device == PID_5249 || device == PID_5250 ||
> device == PID_525A
> 			|| device == PID_525A || device == PID_5260 || device ==
> PID_5261;
> }
> 
> then in rtsx_pci_init_hw() change the unconditional call to:
> 
> 	if rtsx_pci_is_series_A(pcr)
> 		rtsx_pci_init_ocp();
> 
> Does that seem OK?
> 
Previously, I want to remove
else {
		/* OC power down */
		rtsx_pci_write_register(pcr, FPDCTL, OC_POWER_DOWN,
			OC_POWER_DOWN);
}
Because in our A-series card Reader we already assigned option->ocp_en to 1 in self init_params() , this is an easy way to fix this problem

> >> If you agree, I can prepare a patch and send it to you. Whatever the solution is,
> it
> >> will also be needed in the stable
> >> kernels later than 5.0.
> >>
> >
> > OK, I agree your opinion, for now can only patch rts5229 first make NUC6 user
> can work well
> >
> > Thank you
> >
> >> Chris
> >>>> greg k-h
> >>>>
> >>>> ------Please consider the environment before printing this e-mail.

  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
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 [this message]
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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