forked from luck/tmp_suning_uos_patched
mmc: Add .multi_io_quirk callback for multi I/O HW bug
Historically, we have been using MMC_CAP* to handle host HW issues and currently the block layer uses MMC_CAP2_NO_MULTI_READ flag for a multi I/O HW bug workaround. There are a few tweaks needed to make MMC_CAP2_NO_MULTI_READ suite all situations. Therefore let's add an optional host ops callback to enable host drivers to return the number of blocks it allows per request. In a future patch and when host drivers have converted to the new callback, MMC_CAP2_NO_MULTI_READ shall be removed. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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@ -1402,6 +1402,16 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
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if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
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rq_data_dir(req) == READ)
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brq->data.blocks = 1;
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/*
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* Some controllers have HW issues while operating
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* in multiple I/O mode
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*/
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if (card->host->ops->multi_io_quirk)
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brq->data.blocks = card->host->ops->multi_io_quirk(card,
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(rq_data_dir(req) == READ) ?
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MMC_DATA_READ : MMC_DATA_WRITE,
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brq->data.blocks);
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}
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if (brq->data.blocks > 1 || do_rel_wr) {
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@ -139,6 +139,13 @@ struct mmc_host_ops {
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int (*select_drive_strength)(unsigned int max_dtr, int host_drv, int card_drv);
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void (*hw_reset)(struct mmc_host *host);
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void (*card_event)(struct mmc_host *host);
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/*
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* Optional callback to support controllers with HW issues for multiple
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* I/O. Returns the number of supported blocks for the request.
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*/
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int (*multi_io_quirk)(struct mmc_card *card,
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unsigned int direction, int blk_size);
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};
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struct mmc_card;
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