sdio: enable wide bus mode (4ff6471c) · Commits · 戴 / test

drivers/mmc/core/sdio.c

+33 −0

Original line number	Diff line number	Diff line
		@@ -138,6 +138,32 @@ out:
		return ret;
		}

		static int sdio_enable_wide(struct mmc_card *card)
		{
		int ret;
		u8 ctrl;

		if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
		return 0;

		if (card->cccr.low_speed && !card->cccr.wide_bus)
		return 0;

		ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
		if (ret)
		return ret;

		ctrl \|= SDIO_BUS_WIDTH_4BIT;

		ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
		if (ret)
		return ret;

		mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);

		return 0;
		}

		/*
		* Host is being removed. Free up the current card.
		*/
		@@ -299,6 +325,13 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
		*/
		mmc_set_clock(host, card->cis.max_dtr);

		/*
		* Switch to wider bus (if supported).
		*/
		err = sdio_enable_wide(card);
		if (err)
		goto remove;

		/*
		* Initialize (but don't add) all present functions.
		*/