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| From | Maxime Ripard <maxime.ripard@free-electrons.com> |
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2 04/10] mmc: sunxi: Support controllers that can use both old and new timings |
| Date | Fri, 21 Jul 2017 09:30:02 +0200 |
| Message-ID | <u5AxQ-1LL-3@gated-at.bofh.it> (permalink) |
| References | <u5aDn-1w5-3@gated-at.bofh.it> <u5aDp-1w5-17@gated-at.bofh.it> |
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| X-Original-Cc | Ulf Hansson <ulf.hansson@linaro.org>, Michael Turquette <mturquette@baylibre.com>, Stephen Boyd <sboyd@codeaurora.org>, Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>, linux-arm-kernel@lists.infradead.org, linux-mmc@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com |
| X-Original-Date | Fri, 21 Jul 2017 09:20:39 +0200 |
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| X-Original-References | <20170720034452.15920-1-wens@csie.org> <20170720034452.15920-5-wens@csie.org> |
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On Thu, Jul 20, 2017 at 11:44:46AM +0800, Chen-Yu Tsai wrote: > On the SoCs that introduced the new timing mode for MMC controllers, > both the old (where the clock delays are set in the CCU) and new > (where the clock delays are set in the MMC controller) timing modes > are available, and we have to support them both. However there are > two bits that control which mode is active. One is in the CCU, the > other is in the MMC controller. The settings on both sides must be > the same, or nothing will work. > > The sunxi-ng clock driver provides an API to query and set the > active timing mode. At probe time, we try to set the active mode > to the "new timing mode". If it succeeds, we can then use the MMC > controller in the new mode. If not, we fall back to the old mode. > > Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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[PATCH v2 04/10] mmc: sunxi: Support controllers that can use both old and new timings Chen-Yu Tsai <wens@csie.org> - 2017-07-20 05:50 +0200 Re: [PATCH v2 04/10] mmc: sunxi: Support controllers that can use both old and new timings Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-07-21 09:30 +0200
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