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[82.243.161.21]) by smtp.gmail.com with ESMTPSA id o5sm3076191wmc.16.2019.04.30.13.28.30 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 30 Apr 2019 13:28:31 -0700 (PDT) Message-ID: <0bd1e9c25ab11112c9f2913c2cb3483e8802099d.camel@baylibre.com> Subject: Re: [PATCH v2 4/7] mmc: meson-gx: disable HS400 From: Jerome Brunet To: Martin Blumenstingl Date: Tue, 30 Apr 2019 22:28:27 +0200 In-Reply-To: References: <20190423090235.17244-1-jbrunet@baylibre.com> <20190423090235.17244-5-jbrunet@baylibre.com> <17c5978419c8778eb1f2c2a6e2aee66e864ac53d.camel@baylibre.com> <936229765eac2bcdacf9a53925bb17c38ea18e3a.camel@baylibre.com> User-Agent: Evolution 3.30.5 (3.30.5-1.fc29) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190430_132834_791953_59617438 X-CRM114-Status: GOOD ( 13.71 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Hilman , Ulf Hansson , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org On Tue, 2019-04-30 at 22:02 +0200, Martin Blumenstingl wrote: > > Thanks for effort but all this just maintain the blur around HS400 on amlogic. > > > > Let me rephrase it: > > Tuning (phase or resampling) is meant to compensate the clock round trip in UHS > > and HS200 modes. In HS400, this should be taken care of by the data strobe. > > But we have not been to enable this reliably enable this on amlogic chipset ... > I wasn't aware of this: so far I assumed that we're not setting the > phase correctly, end of the story. > thank you again for taking your time to explain this! No worries. There is the MMC in general, I think I understand it a bit now but I might still be mistaken about some stuff. Then there is the HW we have and the related black magic. I doubt this is the last update in this driver ... > > > ... and I believe we are back to the original commit message. > no need to update the description just to explain how HS400 works in > general, so feel free to use my: > Acked-by: Martin Blumenstingl _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic