mmc: sdio: fix resume failure due to lack of CMD52 reset (51aa66a5) · Commits · 戴 / test

If SDIO keep power flag (MMC_PM_KEEP_POWER) is not set, card would be reinitialized during resume but as we are not resetting (CMD52 reset) the SDIO card during this reinitialization, card may fail to respond back to subsequent commands (CMD5 etc...). This change resets the card before the reinitialization of card during resume. Signed-off-by:

Subhash Jadavani <subhashj@codeaurora.org> Acked-by:

Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by:

Chris Ball <cjb@laptop.org>

drivers/mmc/core/sdio.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -937,10 +937,12 @@ static int mmc_sdio_resume(struct mmc_host *host)
		mmc_claim_host(host);

		/* No need to reinitialize powered-resumed nonremovable cards */
		if (mmc_card_is_removable(host) \|\| !mmc_card_keep_power(host))
		if (mmc_card_is_removable(host) \|\| !mmc_card_keep_power(host)) {
		sdio_reset(host);
		mmc_go_idle(host);
		err = mmc_sdio_init_card(host, host->ocr, host->card,
		mmc_card_keep_power(host));
		else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
		} else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
		/* We may have switched to 1-bit mode during suspend */
		err = sdio_enable_4bit_bus(host->card);
		if (err > 0) {

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