[{"id":3682951,"web_url":"http://patchwork.ozlabs.org/comment/3682951/","msgid":"<91b9a06ae21a64c0fec04f053798f302689a0067.camel@grimler.se>","list_archive_url":null,"date":"2026-04-27T20:23:28","subject":"Re: [PATCH 0/4] HS400 and HS400ES support for Exynos DW-MMC drivers","submitter":{"id":83221,"url":"http://patchwork.ozlabs.org/api/people/83221/","name":"Henrik Grimler","email":"henrik@grimler.se"},"content":"Hi Kaustabh,\n\nOn Mon, 2026-04-27 at 11:22 +0530, Kaustabh Chakraborty wrote:\n> Since upstream dts version v7.0+, Exynos 7870 devices have an\n> explicit\n> `bus-width = <8>` property. This results in the U-Boot driver trying\n> to\n> initialize the HS400 mode, which appears to fail. The HS400 support\n> added in the DW-MMC Exynos driver appears to have an incomplete init\n> sequence.\n> \n> This patch series adds the missing pieces to enable HS400 support,\n> and\n> additionally adds support for HS400ES too.\n\nSeems like exynos5422-odroid-xu4 can support hs400 as well based on\nHardkernel's device trees [1]. I will try to test on that device during\nthe week to get some more test coverage for this series.\n\n[1]\nhttps://github.com/hardkernel/linux/blob/odroidxu4-6.1.y/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi#L491\n\nBest regards,\nHenrik Grimler\n\n> The last patch in the series also enables HS400ES support in the\n> exynos-mobile defconfig.\n> \n> Signed-off-by: Kaustabh Chakraborty \n> ---\n> Kaustabh Chakraborty (4):\n>       mmc: exynos_dw_mmc: add proper init sequence for HS400 support\n>       mmc: dw_mmc: setup set_enhanced_strobe ops in driver\n>       mmc: exynos_dw_mmc: add support for HS400ES\n>       configs: exynos-mobile: enable support for HS400ES in MMC\n> driver\n> \n>  arch/arm/mach-exynos/include/mach/dwmmc.h |  5 ++\n>  configs/exynos-mobile_defconfig           |  1 +\n>  drivers/mmc/dw_mmc.c                      | 19 +++++++\n>  drivers/mmc/exynos_dw_mmc.c               | 88\n> ++++++++++++++++++++++++++++++-\n>  include/dwmmc.h                           | 10 ++++\n>  5 files changed, 121 insertions(+), 2 deletions(-)\n> ---\n> base-commit: 9f61fd5b80a43ae20ba115e3a2933d47d720ab82\n> change-id: 20260427-dwmmc-exynos-hs400-es-b77009a808ce\n> \n> Best regards,\n> --  \n> Kaustabh Chakraborty ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n secure) header.d=grimler.se header.i=@grimler.se header.a=rsa-sha256\n header.s=key1 header.b=BE/0hmbo;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; 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