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From: "Chunfeng Yun (云春峰)" <Chunfeng.Yun@mediatek.com>
To: "robh@kernel.org" <robh@kernel.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-mediatek@lists.infradead.org"
	<linux-mediatek@lists.infradead.org>,
	"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"mathias.nyman@intel.com" <mathias.nyman@intel.com>,
	"Eddie Hung (洪正鑫)" <Eddie.Hung@mediatek.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	"matthias.bgg@gmail.com" <matthias.bgg@gmail.com>
Subject: Re: [PATCH 03/11] dt-bindings: usb: mtk-xhci: add compatible for mt8195
Date: Thu, 19 Aug 2021 11:36:01 +0000	[thread overview]
Message-ID: <8166fa917d6df5002617c5fb5d614e5ff5bd6af6.camel@mediatek.com> (raw)
In-Reply-To: <CAL_JsqKjjPqArmhoXuYrk+1C-vXFSKNA_gxtOfLFsGTGBq20aQ@mail.gmail.com>

On Wed, 2021-08-18 at 09:20 -0500, Rob Herring wrote:
> On Wed, Aug 11, 2021 at 3:02 AM Chunfeng Yun (云春峰)
> <Chunfeng.Yun@mediatek.com> wrote:
> > 
> > On Fri, 2021-08-06 at 14:43 -0600, Rob Herring wrote:
> > > On Fri, Jul 30, 2021 at 04:49:54PM +0800, Chunfeng Yun wrote:
> > > > There are 4 USB controllers on MT8195, the controllers
> > > > (IP1~IP3,
> > > > exclude IP0) have a wrong default SOF/ITP interval which is
> > > > calculated from the frame counter clock 24Mhz by default, but
> > > > in fact, the frame counter clock is 48Mhz, so we should set
> > > > the accurate interval according to 48Mhz. Here add a new
> > > > compatible
> > > > for MT8195, it's also supported in driver. But the first
> > > > controller
> > > > (IP0) has no such issue, we prefer to use generic compatible,
> > > > e.g. mt8192's compatible.
> > > 
> > > That only works until you find some 8195 bug common to all
> > > instances.
> > 
> > It's also OK for IP0 to use mt8195's compatible, these setting
> > value is
> > the same as IP0's default value, use mt8192's may avoid these dummy
> > setting.
> 
> I still don't understand. By use mt8192's compatible, that means you
> have for IP0:
> 
> compatible = "mediatek,mt8192-xhci", "mediatek,mtk-xhci";
> 
> And for the rest:
> compatible = "mediatek,mt8195-xhci", "mediatek,mtk-xhci";
No, use "mediatek,mt8195-xhci" is also ok for IP0.

Seems need modify commit log and remove last sentence to avoid
misunderstanding.

Thanks

> 
> If there's a 8195 quirk you need to work around, then you can't on
> IP0. You need to be able to address quirks in the future without
> changing the DTB. That is why we require SoC specific compatibles
> even
> when IP blocks are 'the same'.
> 
> Rob

  reply	other threads:[~2021-08-19 11:36 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30  8:49 [PATCH 01/11] dt-bindings: usb: mtk-xhci: add support property 'tpl-support' Chunfeng Yun
2021-07-30  8:49 ` [PATCH 02/11] dt-bindings: usb: mtk-xhci: add optional property to disable usb2 ports Chunfeng Yun
2021-08-06 20:41   ` Rob Herring
2021-08-11  8:12     ` Chunfeng Yun (云春峰)
2021-07-30  8:49 ` [PATCH 03/11] dt-bindings: usb: mtk-xhci: add compatible for mt8195 Chunfeng Yun
2021-08-06 20:43   ` Rob Herring
2021-08-11  8:02     ` Chunfeng Yun (云春峰)
2021-08-18 14:20       ` Rob Herring
2021-08-19 11:36         ` Chunfeng Yun (云春峰) [this message]
2021-07-30  8:49 ` [PATCH 04/11] usb: xhci-mtk: fix use-after-free of mtk->hcd Chunfeng Yun
2021-08-13  5:26   ` Ikjoon Jang
2021-07-30  8:49 ` [PATCH 05/11] usb: xhci-mtk: add support 'tpl-support' Chunfeng Yun
2021-07-30  8:49 ` [PATCH 06/11] usb: xhci-mtk: support option to disable usb2 ports Chunfeng Yun
2021-07-30  8:49 ` [PATCH 07/11] usb: xhci-mtk: fix issue of out-of-bounds array access Chunfeng Yun
2021-07-30  8:49 ` [PATCH 08/11] usb: xhci-mtk: update fs bus bandwidth by bw_budget_table Chunfeng Yun
2021-08-03  6:05   ` Ikjoon Jang
2021-08-04  5:19     ` Chunfeng Yun
2021-08-04 14:06       ` Ikjoon Jang
2021-08-10  1:45         ` Chunfeng Yun (云春峰)
2021-07-30  8:50 ` [PATCH 09/11] usb: xhci-mtk: check boundary before check tt Chunfeng Yun
2021-08-09  7:32   ` Ikjoon Jang
2021-08-11  8:18     ` Chunfeng Yun (云春峰)
2021-07-30  8:50 ` [PATCH 10/11] usb: xhci-mtk: add a member of num_esit Chunfeng Yun
2021-07-30  8:50 ` [PATCH 11/11] usb: xhci-mtk: modify the SOF/ITP interval for mt8195 Chunfeng Yun
2021-08-06 20:37 ` [PATCH 01/11] dt-bindings: usb: mtk-xhci: add support property 'tpl-support' Rob Herring
2021-08-11  7:54   ` Chunfeng Yun (云春峰)
2021-08-12  2:28   ` Chunfeng Yun (云春峰)

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