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Message-ID: <bded4371-5ebd-b4c3-5dd3-ea6e52a50214@rock-chips.com> Date: Thu, 23 Jun 2016 09:35:33 +0800 From: Shawn Lin <shawn.lin@...k-chips.com> To: Ulf Hansson <ulf.hansson@...aro.org> Cc: shawn.lin@...k-chips.com, Jaehoon Chung <jh80.chung@...sung.com>, Rob Herring <robh+dt@...nel.org>, linux-mmc <linux-mmc@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Doug Anderson <dianders@...omium.org>, "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org> Subject: Re: [RFC PATCH 0/4] Introduce new caps to improve the card's init sequence 在 2016/6/22 20:37, Ulf Hansson 写道: > On 8 June 2016 at 10:19, Shawn Lin <shawn.lin@...k-chips.com> wrote: >> >> Hi all, >> >> This patchset is gonna improve the card's init sequence >> by exposing some caps to DT. >> >> The basic idea is to skip sending specific init cmd inspired >> by Carlo Caione's commit[0]. >> >> To make it possible, I firstly expose Carlo's MMC_CAP2_NO_SDIO >> to DT and extend two new caps for similar usage of sd and mmc. >> We probably need it because for most of the boards, each of the >> slots should have a specific function when designed. It's impossible >> for one slot which can either to be used as eMMC or a SD card for a >> given board. The same for SDIO case. >> >> We could have two ways to improve it >> A) Skip sending specific commands if knowing we don't support >> the specific card type. >> B) Allow sending specific commands if knowing we do support >> the specific card type. >> >> A) and B) shouldn't have difference, but I take A) as the final >> one as it looks more consistent with Carlo's way, which does not >> seem to break anything as possible. >> >> The only roadblock for this patchset to be landed should be the >> improvement we gain from it. Theoretically sdio-card doesn't get >> improvment as it's already in the first place to be attached. >> But considering the sd and (e)MMC case, we should gain more benifit >> from it. >> >> From the test, we can save nearly 2ms for attaching emmc against the >> original 8ms. And we gain more than 30us improvement for sd card for >> each insert. >> >> [0]: http://permalink.gmane.org/gmane.linux.kernel.mmc/34774 >> >> >> >> Shawn Lin (4): >> Documentation: mmc: add description for new caps >> mmc: core: expose MMC_CAP2_NO_SDIO to dt-binding >> mmc: core: add cap-no-sd and cap-no-mmc properties >> mmc: core: improve initialization flow >> > > I would prefer that you restructure this series a bit. I will do it and I think Doug was asking we to drop the "cap-" prefix which I think need to be clarified before sending non-RFC one. :) > > Start by adding each new MMC_CAP2* separately and without involving > the DT parsing. > > Make the DT documentation patch come after the above, and add a new > separate patch which exposes the caps to device tree. > > In that way, I can pick up the non DT parts and wait for Rob's > ack/nack of the DT bindings. > > Kind regards > Uffe > >> Documentation/devicetree/bindings/mmc/mmc.txt | 3 +++ >> drivers/mmc/core/core.c | 10 +++++----- >> drivers/mmc/core/host.c | 6 ++++++ >> include/linux/mmc/host.h | 2 ++ >> 4 files changed, 16 insertions(+), 5 deletions(-) >> >> -- >> 2.3.7 >> >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in >> the body of a message to majordomo@...r.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > > -- Best Regards Shawn Lin
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