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Commit 1addfcdb authored by Pierre Ossman's avatar Pierre Ossman
Browse files

mmc: break apart switch function 



Break apart the SD switch function into one that reads the capabilities
and one that acts on them.

Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
parent 55556da0

drivers/mmc/core/sd.c

+41 −8
Original line number Diff line number Diff line
@@ -183,16 +183,13 @@ static void mmc_decode_scr(struct mmc_card *card) 
}



/*

 * Test if the card supports high-speed mode and, if so, switch to it.

 * Fetches and decodes switch information

 */

static int mmc_switch_hs(struct mmc_card *card)

static int mmc_read_switch(struct mmc_card *card)

{

	int err;

	u8 *status;



	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))

		return MMC_ERR_NONE;



	err = MMC_ERR_FAILED;



	status = kmalloc(64, GFP_KERNEL);
@@ -209,7 +206,6 @@ static int mmc_switch_hs(struct mmc_card *card) 
		 * Card not supporting high-speed will ignore the

		 * command.

		 */

		if (err == MMC_ERR_TIMEOUT)

		err = MMC_ERR_NONE;

		goto out;

	}
@@ -217,6 +213,36 @@ static int mmc_switch_hs(struct mmc_card *card) 
	if (status[13] & 0x02)

		card->sw_caps.hs_max_dtr = 50000000;



out:

	kfree(status);



	return err;

}



/*

 * Test if the card supports high-speed mode and, if so, switch to it.

 */

static int mmc_switch_hs(struct mmc_card *card)

{

	int err;

	u8 *status;



	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))

		return MMC_ERR_NONE;



	if (card->sw_caps.hs_max_dtr == 0)

		return MMC_ERR_NONE;



	err = MMC_ERR_FAILED;



	status = kmalloc(64, GFP_KERNEL);

	if (!status) {

		printk("%s: could not allocate a buffer for switch "

		       "capabilities.\n",

			mmc_hostname(card->host));

		return err;

	}



	err = mmc_sd_switch(card, 1, 0, 1, status);

	if (err != MMC_ERR_NONE)

		goto out;
@@ -393,7 +419,14 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr) 
	mmc_decode_scr(card);



	/*

	 * Check if card can be switched into high-speed mode.

	 * Fetch switch information from card.

	 */

	err = mmc_read_switch(card);

	if (err != MMC_ERR_NONE)

		goto free_card;



	/*

	 * Attempt to change to high-speed (if supported)

	 */

	err = mmc_switch_hs(card);

	if (err != MMC_ERR_NONE)