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2c5d427690
Rather than only deselecting the SD card via a CMD7, before we cut power to it at system suspend, at runtime suspend or at shutdown, let's add support for a graceful power off sequence via enabling the SD Power Off Notification feature. Note that, the Power Off Notification feature was added in the SD spec v4.x, which is several years ago. However, it's still a bit unclear how often the SD card vendors decides to implement support for it. To validate these changes a Sandisk Extreme PRO A2 64GB has been used, which seems to work nicely. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Avri Altman <avri.altman@wdc.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com> Link: https://lore.kernel.org/r/20210504161222.101536-12-ulf.hansson@linaro.org |
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