diff options
Diffstat (limited to 'drivers/mmc/card/block.c')
| -rw-r--r-- | drivers/mmc/card/block.c | 122 |
1 files changed, 96 insertions, 26 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 3d067c3..45b1f43 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -145,7 +145,7 @@ struct mmc_blk_request { static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) { int err; - u32 blocks; + __be32 blocks; struct mmc_request mrq; struct mmc_command cmd; @@ -204,9 +204,24 @@ static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) if (cmd.error || data.error) return (u32)-1; - blocks = ntohl(blocks); + return ntohl(blocks); +} + +static u32 get_card_status(struct mmc_card *card, struct request *req) +{ + struct mmc_command cmd; + int err; - return blocks; + memset(&cmd, 0, sizeof(struct mmc_command)); + cmd.opcode = MMC_SEND_STATUS; + if (!mmc_host_is_spi(card->host)) + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; + err = mmc_wait_for_cmd(card->host, &cmd, 0); + if (err) + printk(KERN_ERR "%s: error %d sending status comand", + req->rq_disk->disk_name, err); + return cmd.resp[0]; } static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) @@ -214,13 +229,13 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) struct mmc_blk_data *md = mq->data; struct mmc_card *card = md->queue.card; struct mmc_blk_request brq; - int ret = 1; + int ret = 1, disable_multi = 0; mmc_claim_host(card->host); do { struct mmc_command cmd; - u32 readcmd, writecmd; + u32 readcmd, writecmd, status = 0; memset(&brq, 0, sizeof(struct mmc_blk_request)); brq.mrq.cmd = &brq.cmd; @@ -236,6 +251,14 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; brq.data.blocks = req->nr_sectors; + /* + * After a read error, we redo the request one sector at a time + * in order to accurately determine which sectors can be read + * successfully. + */ + if (disable_multi && brq.data.blocks > 1) + brq.data.blocks = 1; + if (brq.data.blocks > 1) { /* SPI multiblock writes terminate using a special * token, not a STOP_TRANSMISSION request. @@ -264,6 +287,25 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) brq.data.sg = mq->sg; brq.data.sg_len = mmc_queue_map_sg(mq); + /* + * Adjust the sg list so it is the same size as the + * request. + */ + if (brq.data.blocks != req->nr_sectors) { + int i, data_size = brq.data.blocks << 9; + struct scatterlist *sg; + + for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) { + data_size -= sg->length; + if (data_size <= 0) { + sg->length += data_size; + i++; + break; + } + } + brq.data.sg_len = i; + } + mmc_queue_bounce_pre(mq); mmc_wait_for_req(card->host, &brq.mrq); @@ -275,19 +317,40 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) * until later as we need to wait for the card to leave * programming mode even when things go wrong. */ + if (brq.cmd.error || brq.data.error || brq.stop.error) { + if (brq.data.blocks > 1 && rq_data_dir(req) == READ) { + /* Redo read one sector at a time */ + printk(KERN_WARNING "%s: retrying using single " + "block read\n", req->rq_disk->disk_name); + disable_multi = 1; + continue; + } + status = get_card_status(card, req); + } + if (brq.cmd.error) { - printk(KERN_ERR "%s: error %d sending read/write command\n", - req->rq_disk->disk_name, brq.cmd.error); + printk(KERN_ERR "%s: error %d sending read/write " + "command, response %#x, card status %#x\n", + req->rq_disk->disk_name, brq.cmd.error, + brq.cmd.resp[0], status); } if (brq.data.error) { - printk(KERN_ERR "%s: error %d transferring data\n", - req->rq_disk->disk_name, brq.data.error); + if (brq.data.error == -ETIMEDOUT && brq.mrq.stop) + /* 'Stop' response contains card status */ + status = brq.mrq.stop->resp[0]; + printk(KERN_ERR "%s: error %d transferring data," + " sector %u, nr %u, card status %#x\n", + req->rq_disk->disk_name, brq.data.error, + (unsigned)req->sector, + (unsigned)req->nr_sectors, status); } if (brq.stop.error) { - printk(KERN_ERR "%s: error %d sending stop command\n", - req->rq_disk->disk_name, brq.stop.error); + printk(KERN_ERR "%s: error %d sending stop command, " + "response %#x, card status %#x\n", + req->rq_disk->disk_name, brq.stop.error, + brq.stop.resp[0], status); } if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) { @@ -320,8 +383,20 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) #endif } - if (brq.cmd.error || brq.data.error || brq.stop.error) + if (brq.cmd.error || brq.stop.error || brq.data.error) { + if (rq_data_dir(req) == READ) { + /* + * After an error, we redo I/O one sector at a + * time, so we only reach here after trying to + * read a single sector. + */ + spin_lock_irq(&md->lock); + ret = __blk_end_request(req, -EIO, brq.data.blksz); + spin_unlock_irq(&md->lock); + continue; + } goto cmd_err; + } /* * A block was successfully transferred. @@ -343,25 +418,20 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) * If the card is not SD, we can still ok written sectors * 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) { - if (mmc_card_sd(card)) { - u32 blocks; + if (mmc_card_sd(card)) { + u32 blocks; - blocks = mmc_sd_num_wr_blocks(card); - if (blocks != (u32)-1) { - spin_lock_irq(&md->lock); - ret = __blk_end_request(req, 0, blocks << 9); - spin_unlock_irq(&md->lock); - } - } else { + blocks = mmc_sd_num_wr_blocks(card); + if (blocks != (u32)-1) { spin_lock_irq(&md->lock); - ret = __blk_end_request(req, 0, brq.data.bytes_xfered); + ret = __blk_end_request(req, 0, blocks << 9); spin_unlock_irq(&md->lock); } + } 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); |
