kernel/linux.git/drivers/mmc/core/mmc.c, branch v5.16

mmc: core: Add host specific tuning support for eMMC HS400 mode

2021-10-12T08:21:18+00:00

This adds a ->execute_hs400_tuning() host callback to enable optional support for host specific tuning for eMMC HS400 mode. Additionally, share mmc_get_ext_csd() through the public host headerfile, to allow it to be used by the host drivers, which is needed to support the HS400 tuning. Signed-off-by: Wenbin Mei Link: https://lore.kernel.org/r/20210917124803.22871-3-wenbin.mei@mediatek.com Signed-off-by: Ulf Hansson

mmc: block: Support alternative_gpt_sector() operation

2021-08-24T16:09:06+00:00

Support generic alternative_gpt_sector() block device operation. It calculates location of GPT entry for eMMC of NVIDIA Tegra Android devices. Add new MMC_CAP2_ALT_GPT_TEGRA flag that enables scanning of alternative GPT sector and add raw_boot_mult field to mmc_ext_csd which allows to get size of the boot partitions that is needed for the calculation. Signed-off-by: Dmitry Osipenko Reviewed-by: Ulf Hansson Link: https://lore.kernel.org/r/20210820004536.15791-4-digetx@gmail.com Signed-off-by: Jens Axboe

mmc: core: Move eMMC cache flushing to a new bus_ops callback

2021-06-14T11:57:37+00:00

To prepare to add internal cache management for SD cards, let's start by moving the eMMC specific code into a new ->flush_cache() bus_ops callback. In this way, it becomes straight forward to add the SD specific parts, as subsequent changes are about to show. Signed-off-by: Ulf Hansson Reviewed-by: Avri Altman Reviewed-by: Linus Walleij Link: https://lore.kernel.org/r/20210506145829.198823-2-ulf.hansson@linaro.org

mmc: core: Enable eMMC sleep commands to use HW busy polling

2021-06-14T11:57:36+00:00

After the eMMC sleep command (CMD5) has been sent, the card start signals busy on the DAT0 line, which can be monitored to understand when it's allowed to proceed to power off the VCC regulator. When MMC_CAP_WAIT_WHILE_BUSY isn't supported by the host the DAT0 line isn't being monitored for busy completion, but instead we are waiting a fixed period of time. The time corresponds to the sleep timeout that is specified in the EXT_CSD register of the eMMC card. This is many cases suboptimal, as the timeout corresponds to the worst case scenario. To improve the situation add support for HW busy polling through the ->card_busy() host ops, when the host supports this. Signed-off-by: Ulf Hansson Reviewed-by: Linus Walleij Reviewed-by: Shawn Lin Acked-by: Avri Altman Link: https://lore.kernel.org/r/20210504161222.101536-6-ulf.hansson@linaro.org

mmc: core: Drop open coding when preparing commands with busy signaling

2021-06-14T11:57:35+00:00

Similar code for validating the host->max_busy_timeout towards the current command's busy timeout, exists in mmc_do_erase(), mmc_sleep() and __mmc_switch(). Let's move the common code into a helper function. Signed-off-by: Ulf Hansson Reviewed-by: Linus Walleij Reviewed-by: Shawn Lin Acked-by: Avri Altman Link: https://lore.kernel.org/r/20210504161222.101536-2-ulf.hansson@linaro.org

mmc: block: Issue a cache flush only when it's enabled

2021-04-26T09:37:23+00:00

In command queueing mode, the cache isn't flushed via the mmc_flush_cache() function, but instead by issuing a CMDQ_TASK_MGMT (CMD48) with a FLUSH_CACHE opcode. In this path, we need to check if cache has been enabled, before deciding to flush the cache, along the lines of what's being done in mmc_flush_cache(). To fix this problem, let's add a new bus ops callback ->cache_enabled() and implement it for the mmc bus type. In this way, the mmc block device driver can call it to know whether cache flushing should be done. Fixes: 1e8e55b67030 (mmc: block: Add CQE support) Cc: stable@vger.kernel.org Reported-by: Brendan Peter Signed-off-by: Avri Altman Tested-by: Brendan Peter Acked-by: Adrian Hunter Link: https://lore.kernel.org/r/20210425060207.2591-2-avri.altman@wdc.com Link: https://lore.kernel.org/r/20210425060207.2591-3-avri.altman@wdc.com [Ulf: Squashed the two patches and made some minor updates] Signed-off-by: Ulf Hansson

mmc: core: Add a retries parameter to __mmc_switch function

2021-04-15T11:43:17+00:00

Add command retries parameter to __mmc_switch(), let caller pass retries according to the caller's condition. Signed-off-by: Bean Huo Link: https://lore.kernel.org/r/20210414212236.346813-2-huobean@gmail.com Signed-off-by: Ulf Hansson

mmc: core: Fix partition switch time for eMMC

2021-03-09T09:00:52+00:00

Avoid the following warning by always defining partition switch time: [ 3.209874] mmc1: unspecified timeout for CMD6 - use generic [ 3.222780] ------------[ cut here ]------------ [ 3.233363] WARNING: CPU: 1 PID: 111 at drivers/mmc/core/mmc_ops.c:575 __mmc_switch+0x200/0x204 Reported-by: Paul Fertser Fixes: 1c447116d017 ("mmc: mmc: Fix partition switch timeout for some eMMCs") Signed-off-by: Adrian Hunter Link: https://lore.kernel.org/r/168bbfd6-0c5b-5ace-ab41-402e7937c46e@intel.com Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson

mmc: core: remove redundant card null check to mmc_can_sleep()

2021-02-01T10:54:46+00:00

Note that only _mmc_suspend() will call mmc_can_sleep(). And card is checked before in mmc_can_poweroff_notify(). Signed-off-by: Yue Hu Link: https://lore.kernel.org/r/20210115034506.646-1-zbestahu@gmail.com Signed-off-by: Ulf Hansson

mmc: core: remove needless err = 0 in mmc_init_card()

2021-02-01T10:54:45+00:00

Since they will always being in successful path to return 0 directly, no need to set err = 0. Signed-off-by: Yue Hu Link: https://lore.kernel.org/r/20210113113431.522-1-zbestahu@gmail.com Signed-off-by: Ulf Hansson