Messages in this thread | | | Date | Wed, 25 Feb 2015 19:22:39 +0100 | From | Javier Martinez Canillas <> | Subject | Re: [PATCH v2] mmc: dw_mmc: Don't start commands while busy |
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Hello Doug,
On 02/20/2015 09:31 PM, Doug Anderson wrote: > We've seen problems on some WiFi modules where we seem to send a CMD53 > (which requires the data lines) while the module is asserting busy. > We shouldn't do that. > > The Designware Databook says that before issuing a new data transfer > command we should check for busy, so that's what we'll do. > > We'll leverage the existing dw_mmc knowledge about whether it should > wait for the previous command to finish to know whether we should > check for busy before sending the command. This means we won't end up > incorrectly waiting for things like CMD52 (SDIO) or CMD13 (SD) which > don't use the data line. > > Note that this also has the advantage of making sure that we don't > change the clock while the card is busy, too. > > Signed-off-by: Doug Anderson <dianders@chromium.org> >
On an Exynos5250 Snow, Exynos5420 Peach Pit and Exynos5800 Peach Pi:
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Best regards, Javier
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