kernel/drivers/mmc/core/sd_ops.c, branch linux-6.9.y

mmc: core: Add host specific tuning support for SD HS mode

2023-08-25T09:45:51Z

To support the need for host specific tuning for SD high-speed mode, let's add two new optional callbacks, ->prepare|execute_sd_hs_tuning() and let's call them when switching into the SD high-speed mode. Note that, during the tuning process it's also needed for host drivers to send commands to the SD card to verify that the tuning process succeeds. Therefore, let's also share the corresponding functions from the core to allow this. Signed-off-by: Wenchao Chen Link: https://lore.kernel.org/r/20230825091743.15613-2-wenchao.chen@unisoc.com [Ulf: Dropped unnecessary function declarations and updated the commit msg] Signed-off-by: Ulf Hansson

mmc: core: Drop open coding in mmc_sd_switch()

2021-06-14T11:57:36Z

The SD_SWITCH (CMD6) is an ADTC type of command with an R1 response, which can be sent by using the mmc_send_adtc_data(). Let's do that and drop the open coding in mmc_sd_switch(). Signed-off-by: Ulf Hansson Reviewed-by: Linus Walleij Reviewed-by: Shawn Lin Acked-by: Avri Altman Link: https://lore.kernel.org/r/20210504161222.101536-8-ulf.hansson@linaro.org

mmc: core: Initial support for SD express card/host

2020-11-16T10:59:28Z

In the SD specification v7.10 the SD express card has been added. This new type of removable SD card, can be managed via a PCIe/NVMe based interface, while also allowing backwards compatibility towards the legacy SD interface. To keep the backwards compatibility, it's required to start the initialization through the legacy SD interface. If it turns out that the mmc host and the SD card, both supports the PCIe/NVMe interface, then a switch should be allowed. Therefore, let's introduce some basic support for this type of SD cards to the mmc core. The mmc host, should set MMC_CAP2_SD_EXP if it supports this interface and MMC_CAP2_SD_EXP_1_2V, if also 1.2V is supported, as to inform the core about it. To deal with the switch to the PCIe/NVMe interface, the mmc host is required to implement a new host ops, ->init_sd_express(). Based on the initial communication between the host and the card, host->ios.timing is set to either MMC_TIMING_SD_EXP or MMC_TIMING_SD_EXP_1_2V, depending on if 1.2V is supported or not. In this way, the mmc host can check these values in its ->init_sd_express() ops, to know how to proceed with the handover. Note that, to manage card insert/removal, the mmc core sticks with using the ->get_cd() callback, which means it's the host's responsibility to make sure it provides valid data, even if the card may be managed by PCIe/NVMe at the moment. As long as the card seems to be present, the mmc core keeps the card powered on. Cc: Greg Kroah-Hartman Cc: Arnd Bergmann Cc: Christoph Hellwig Cc: Rui Feng Signed-off-by: Ulf Hansson Reviewed-by: Greg Kroah-Hartman Link: https://lore.kernel.org/r/1603936636-3126-1-git-send-email-rui_feng@realsil.com.cn

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32Z

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman

mmc: core: Drop retries as in-parameter to mmc_wait_for_app_cmd()

2019-02-25T14:20:58Z

All callers of mmc_wait_for_app_cmd() set the retries in-parameter to MMC_CMD_RETRIES. This is silly, so let's just drop the in-parameter altogether, as to simplify the code. Signed-off-by: Ulf Hansson

mmc: core: Convert mmc_wait_for_app_cmd() to static

2019-02-25T14:20:58Z

mmc_wait_for_app_cmd() is an internal function for sd_ops.c, thus let's drop the unnecessary export and turn it into static function. Signed-off-by: Ulf Hansson

mmc: core: add proper be32 annotation

2017-04-24T19:42:19Z

Annotate big endian values correctly and make sparse happy. In mmc_app_send_scr remove scr function parameter as it was updating card->raw_scr anyway. Signed-off-by: Tomas Winkler Signed-off-by: Ulf Hansson

mmc: use empty initializer list to zero-clear structures

2017-02-13T12:19:54Z

In the MMC subsystem, we see such initializers that only clears the first member explicitly. For example, struct mmc_request mrq = {NULL}; sets the first member (.sbc) to NULL explicitly. However, this is an unstable form because we may insert a non-pointer member at the top of the struct mmc_request in the future. (if we do so, the compiler will spit warnings.) So, using a designated initializer is preferred coding style. The expression above is equivalent to: struct mmc_request mrq = { .sbc = NULL }; Of course, this does not express our intention. We want to fill all struct members with zeros. Please note struct members are implicitly zero-cleared unless otherwise specified in the initializer. After all, the most reasonable (and stable) form is: struct mmc_request mrq = {}; Do likewise for mmc_command, mmc_data as well. Signed-off-by: Masahiro Yamada Reviewed-by: Linus Walleij Signed-off-by: Ulf Hansson

mmc: core: remove BUG_ONs from sd

2016-12-05T09:31:10Z

BUG_ONs doesn't help anything except for stop the system from running. If it occurs, it implies we should deploy proper error handling for that. So this patch is gonna discard these meaningless BUG_ONs and deploy error handling if needed. Signed-off-by: Shawn Lin Signed-off-by: Ulf Hansson

mmc: remove unnecessary assignment statements before return

2016-02-29T10:02:47Z

Variable assignment just before return is redundant. Signed-off-by: Masahiro Yamada Signed-off-by: Ulf Hansson