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Date: Sun, 21 Dec 2014 15:04:13 +0100 From: Heiko Stübner <heiko@...ech.de> To: Doug Anderson <dianders@...omium.org> Cc: Addy Ke <addy.ke@...k-chips.com>, Jaehoon Chung <jh80.chung@...sung.com>, Seungwon Jeon <tgih.jun@...sung.com>, Ulf Hansson <ulf.hansson@...aro.org>, Alim Akhtar <alim.akhtar@...sung.com>, Sonny Rao <sonnyrao@...omium.org>, Andrew Bresticker <abrestic@...omium.org>, linux-rockchip@...ts.infradead.org, robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com, ijc+devicetree@...lion.org.uk, galak@...eaurora.org, linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] ARM: dts: Bump SD card pin drive strength up on rk3288-evb Am Mittwoch, 10. Dezember 2014, 12:55:29 schrieb Doug Anderson: > It seems that ever since (536f6b9 mmc: dw_mmc: Reset DMA before > enabling IDMAC) landed upstream that SD cards have been very unhappy > on rk3288-evb. They were a little unhappy before that change, but > after that change they're REALLY unhappy. > > It turns out that the above fix happens to fix a corruption when > reading card information during probe time. Without the fix we didn't > detect that high speed SD cards could actually support high speed. > With the fix we suddenly detect that they're high speed and we try to > use them at 50MHz. That doesn't work so well on EVB with the default > drive strength (maybe because there are two physical SD card slots > hooked up to the same pin?). > > Fix the problem by bumping up the drive strength of the sdmmc lines. > > Signed-off-by: Doug Anderson <dianders@...omium.org> > Fixes: 536f6b91d21b ("mmc: dw_mmc: Reset DMA before enabling IDMAC") applied to my 3.19 dts-fixes branch (after a slight modification of the subject: please use "ARM: dts: rockchip:") Heiko -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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