From: Ulf Hansson <ulf.hansson@linaro.org>
To: Jerome Brunet <jbrunet@baylibre.com>
Cc: Kevin Hilman <khilman@baylibre.com>,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"open list:ARM/Amlogic Meson..."
<linux-amlogic@lists.infradead.org>
Subject: Re: [PATCH v2 0/7] mmc: meson-gx: clean up and tuning update
Date: Mon, 29 Apr 2019 12:44:50 +0200 [thread overview]
Message-ID: <CAPDyKFoQyPKERckAdU+kkw3go=161PWc+5GAkz7y=xWMGbq+SQ@mail.gmail.com> (raw)
In-Reply-To: <20190423090235.17244-1-jbrunet@baylibre.com>
On Tue, 23 Apr 2019 at 11:02, Jerome Brunet <jbrunet@baylibre.com> wrote:
>
> The purpose of this series is too improve reliability of the amlogic mmc
> driver on new (g12a) and old ones (axg, gxl, gxbb, etc...)
>
> * The 3 first patches are just harmless clean ups.
Applied these first three, postponing the the rest until Martin are
happy with all of them. Thanks!
Kind regards
Uffe
> * Patch 4 makes sure HS400 can't be enabled, we still have not been able
> to crack this modes.
> * Patch 5 removes some clock glitches when switching to DDR modes
> * Patch 6 and 7 changes the tuning method from Rx phase to signal
> resampling. It could have been done in a single patch but the unified
> diff was extremely ugly. The change has been split in two patches to
> ease review.
>
> The last tuning update that went through was meant to improve the axg
> support. Since then, it was reported to break some other boards, like the
> s912 vim2.
>
> Also with the current tuning method, it was impossible to find phase
> settings which would work on all the SoCs, including the new ones.
>
> After redoing all the tests from scratch, it appeared that Rx phase made
> (strangely) almost no difference, especially on g12a and axg. However, it
> showed that it is important to have a phase shift between the Core and Tx
> clock, 180 works best.
>
> I discussed the test results with Amlogic. They suggested to use 180/0 or
> 0/180 for the Core and Tx phase. For tuning, they suggested to use
> signal resampling.
>
> So far, so good ... here the platform and modes tested:
>
> NanoPi-K2 (S905): SD UHS SDR50/DDR50, SDIO HS
> Odroid-C2 (S905): SD UHS SDR50/DDR50, eMMC DDR52/HS200 (16GB module)
> Khadas Vim (S905X): SD HS, SDIO HS, eMMC HS200
> Libretech CC (S905X): SD HS, eMMC HS200
> Khadas Vim2 (S912): SD HS, SDIO HS, eMMC HS200
> S400 (A113D): SDIO UHS SDR104, eMMC DDR52/HS200
> U200 (S905D2): SD HS, eMMC DDR52/HS200
> SEI510 (S905X2): SD HS, eMMC DDR52/HS200
>
> Changes since v1 [0]:
> * Add missing writel in patch 5 (error when switching width)
> * Change patch 3 commit description
>
> [0]: https://lkml.kernel.org/r/20190417204355.469-1-jbrunet@baylibre.com
>
> Jerome Brunet (7):
> mmc: meson-gx: remove open coded read with timeout
> mmc: meson-gx: ack only raised irq
> mmc: meson-gx: correct irq flag
> mmc: meson-gx: disable HS400
> mmc: meson-gx: avoid clock glitch when switching to DDR modes
> mmc: meson-gx: remove Rx phase tuning
> mmc: meson-gx: add signal resampling tuning
>
> drivers/mmc/host/meson-gx-mmc.c | 419 +++++++++-----------------------
> 1 file changed, 114 insertions(+), 305 deletions(-)
>
> --
> 2.20.1
>
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next prev parent reply other threads:[~2019-04-29 10:45 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-23 9:02 [PATCH v2 0/7] mmc: meson-gx: clean up and tuning update Jerome Brunet
2019-04-23 9:02 ` [PATCH v2 1/7] mmc: meson-gx: remove open coded read with timeout Jerome Brunet
2019-04-23 9:02 ` [PATCH v2 2/7] mmc: meson-gx: ack only raised irq Jerome Brunet
2019-04-27 19:53 ` Martin Blumenstingl
2019-04-23 9:02 ` [PATCH v2 3/7] mmc: meson-gx: correct irq flag Jerome Brunet
2019-04-27 19:56 ` Martin Blumenstingl
2019-04-23 9:02 ` [PATCH v2 4/7] mmc: meson-gx: disable HS400 Jerome Brunet
2019-04-27 20:02 ` Martin Blumenstingl
2019-04-29 8:29 ` Jerome Brunet
2019-04-29 18:31 ` Martin Blumenstingl
2019-04-29 18:50 ` Jerome Brunet
2019-04-30 20:02 ` Martin Blumenstingl
2019-04-30 20:28 ` Jerome Brunet
2019-04-23 9:02 ` [PATCH v2 5/7] mmc: meson-gx: avoid clock glitch when switching to DDR modes Jerome Brunet
2019-04-27 20:03 ` Martin Blumenstingl
2019-04-23 9:02 ` [PATCH v2 6/7] mmc: meson-gx: remove Rx phase tuning Jerome Brunet
2019-04-27 20:09 ` Martin Blumenstingl
2019-04-23 9:02 ` [PATCH v2 7/7] mmc: meson-gx: add signal resampling tuning Jerome Brunet
2019-04-27 20:09 ` Martin Blumenstingl
2019-04-29 10:44 ` Ulf Hansson [this message]
2019-04-29 18:40 ` [PATCH v2 0/7] mmc: meson-gx: clean up and tuning update Martin Blumenstingl
2019-04-29 19:12 ` Kevin Hilman
2019-04-30 20:03 ` Martin Blumenstingl
2019-05-03 13:28 ` Ulf Hansson
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