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path: root/drivers/mmc/card
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Diffstat (limited to 'drivers/mmc/card')
-rw-r--r--drivers/mmc/card/block.c122
1 files changed, 96 insertions, 26 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 3d067c35185..45b1f430685 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);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-13 02:48:06 +0000