Commit 23af6039 authored by Pierre Ossman's avatar Pierre Ossman
Browse files

mmc: remove multiwrite capability 



Relax requirements on host controllers and only require that they do not
report a transfer count than is larger than the actual one (i.e. a lower
value is okay). This is how many other parts of the kernel behaves so
upper layers should already be prepared to handle that scenario. This
gives us a performance boost on MMC cards.

Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
parent 97067d55

drivers/mmc/card/block.c

+19 −28
Original line number Diff line number Diff line
@@ -237,17 +237,6 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) 
		if (brq.data.blocks > card->host->max_blk_count)

			brq.data.blocks = card->host->max_blk_count;



		/*

		 * If the host doesn't support multiple block writes, force

		 * block writes to single block. SD cards are excepted from

		 * this rule as they support querying the number of

		 * successfully written sectors.

		 */

		if (rq_data_dir(req) != READ &&

		    !(card->host->caps & MMC_CAP_MULTIWRITE) &&

		    !mmc_card_sd(card))

			brq.data.blocks = 1;



		if (brq.data.blocks > 1) {

			/* SPI multiblock writes terminate using a special

			 * token, not a STOP_TRANSMISSION request.
@@ -367,12 +356,14 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) 
 	 * mark the known good sectors as ok.

 	 *

	 * If the card is not SD, we can still ok written sectors

	 * if the controller can do proper error reporting.

	 * as reported by the controller (which might be less than

	 * the real number of written sectors, but never more).

	 *

	 * For reads we just fail the entire chunk as that should

	 * be safe in all cases.

	 */

 	if (rq_data_dir(req) != READ && mmc_card_sd(card)) {

	if (rq_data_dir(req) != READ) {

		if (mmc_card_sd(card)) {

			u32 blocks;

			unsigned int bytes;
@@ -386,12 +377,12 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) 
				ret = __blk_end_request(req, 0, bytes);

				spin_unlock_irq(&md->lock);

			}

	} else if (rq_data_dir(req) != READ &&

		   (card->host->caps & MMC_CAP_MULTIWRITE)) {

		} else {

			spin_lock_irq(&md->lock);

			ret = __blk_end_request(req, 0, brq.data.bytes_xfered);

			spin_unlock_irq(&md->lock);

		}

	}



	mmc_release_host(card->host);

drivers/mmc/host/at91_mci.c

+1 −1
Original line number Diff line number Diff line
@@ -995,7 +995,7 @@ static int __init at91_mci_probe(struct platform_device *pdev) 
	mmc->f_min = 375000;

	mmc->f_max = 25000000;

	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;

	mmc->caps = MMC_CAP_MULTIWRITE | MMC_CAP_SDIO_IRQ;

	mmc->caps = MMC_CAP_SDIO_IRQ;



	mmc->max_blk_size = 4095;

	mmc->max_blk_count = mmc->max_req_size;

drivers/mmc/host/atmel-mci.c

+1 −1
Original line number Diff line number Diff line
@@ -849,7 +849,7 @@ static int __init atmci_probe(struct platform_device *pdev) 
	mmc->f_min = (host->bus_hz + 511) / 512;

	mmc->f_max = host->bus_hz / 2;

	mmc->ocr_avail	= MMC_VDD_32_33 | MMC_VDD_33_34;

	mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE;

	mmc->caps |= MMC_CAP_4_BIT_DATA;



	mmc->max_hw_segs = 64;

	mmc->max_phys_segs = 64;

drivers/mmc/host/mmc_spi.c

+1 −4
Original line number Diff line number Diff line
@@ -1252,10 +1252,7 @@ static int mmc_spi_probe(struct spi_device *spi) 
	mmc->ops = &mmc_spi_ops;

	mmc->max_blk_size = MMC_SPI_BLOCKSIZE;



	/* As long as we keep track of the number of successfully

	 * transmitted blocks, we're good for multiwrite.

	 */

	mmc->caps = MMC_CAP_SPI | MMC_CAP_MULTIWRITE;

	mmc->caps = MMC_CAP_SPI;



	/* SPI doesn't need the lowspeed device identification thing for

	 * MMC or SD cards, since it never comes up in open drain mode.

drivers/mmc/host/mmci.c

+0 −1
Original line number Diff line number Diff line
@@ -535,7 +535,6 @@ static int mmci_probe(struct amba_device *dev, void *id) 
	mmc->f_min = (host->mclk + 511) / 512;

	mmc->f_max = min(host->mclk, fmax);

	mmc->ocr_avail = plat->ocr_mask;

	mmc->caps = MMC_CAP_MULTIWRITE;



	/*

	 * We can do SGIO

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