From: Chen-Yu Tsai <email@example.com> To: Ulf Hansson <firstname.lastname@example.org>, Maxime Ripard <email@example.com> Cc: Chen-Yu Tsai <firstname.lastname@example.org>, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, Chris Blake <firstname.lastname@example.org> Subject: mmc: sunxi: Fix eMMC usage on H5 boards Date: Sun, 3 Feb 2019 23:56:25 +0800 [thread overview] Message-ID: <email@example.com> (raw) Hi everyone, Since the HS-DDR mode was enabled for the A64 eMMC controller, there have been reports of eMMC failing to work on some H5 boards. It seems that while the H5 and A64 share the same controller for eMMC, some H5 boards don't have trace lengths that work under HS-DDR with the default delay chain settings. Unfortunately we don't support tuning them at the moment, and these boards didn't seem to come with any settings either. Instead HS-DDR just wasn't enabled. The failure is typically a data CRC error on data reads, such as the partition scanning when the device is first probed. While this in itself would result in the device being unusable, there seems to be a timing issue in the recovery of the MMC controller. After the CRC error, the driver manually issues a stop command to the device, which also fails. After this a following command would stall: the MMC subsystem waits for the completion notice of the request, which never happens. The stall also blocks udev, which kind of blocks the whole boot process. However if I turn on debug messages to try to narrow down the issue, it recovers just fine. Any help on this issue would be much appreciated. I propose we turn off HS-DDR on the H5 (maybe even the H6, but I don't have anything to test right now) by default, and enable it per-board using the common mmc binding properties for speed modes. Patch 1 disables HS-DDR for H5 eMMC. Patch 2 adds a check blocking (force disabling) any modes the driver doesn't support. In retrospect this should have been added a long time ago. Patch 3 enables HS-DDR for the Libre Computer ALL-H3-CC H5, which works normally. If possible please merge all of them as fixes. Regards ChenYu Chen-Yu Tsai (3): mmc: sunxi: Disable HS-DDR mode for H5 eMMC controller by default mmc: sunxi: Filter out unsupported modes declared in the device tree arm64: dts: allwinner: h5: libretech-all-h3-cc: Mark eMMC HS-DDR 3.3V capable .../sun50i-h5-libretech-all-h3-cc.dts | 4 +++ drivers/mmc/host/sunxi-mmc.c | 27 ++++++++++++++++++- 2 files changed, 30 insertions(+), 1 deletion(-) -- 2.20.1
next reply other threads:[~2019-02-03 15:56 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-02-03 15:56 Chen-Yu Tsai [this message] 2019-02-03 15:56 ` [PATCH 1/3] mmc: sunxi: Disable HS-DDR mode for H5 eMMC controller by default Chen-Yu Tsai 2019-02-04 9:32 ` Maxime Ripard 2019-02-03 15:56 ` [PATCH 2/3] mmc: sunxi: Filter out unsupported modes declared in the device tree Chen-Yu Tsai 2019-02-04 9:34 ` Maxime Ripard 2019-02-04 10:16 ` Chen-Yu Tsai 2019-02-04 13:41 ` Maxime Ripard 2019-02-05 8:42 ` Chen-Yu Tsai 2019-02-05 9:51 ` Maxime Ripard 2019-02-03 15:56 ` [PATCH 3/3] arm64: dts: allwinner: h5: libretech-all-h3-cc: Mark eMMC HS-DDR 3.3V capable Chen-Yu Tsai 2019-02-03 15:59 ` [PATCH 0/3] mmc: sunxi: Fix eMMC usage on H5 boards Chen-Yu Tsai
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