Merge master.kernel.org:/home/rmk/linux-2.6-mmc

* master.kernel.org:/home/rmk/linux-2.6-mmc:
  [MMC] Always use a sector size of 512 bytes
  [MMC] Cleanup 385e3227d4d83ab13d7767c4bb3593b0256bf246
  [ARM] 3751/1: i.MX/MX1 SD/MMC use 512 bytes request for SCR read
  [MMC] Fix SD timeout calculation
  [MMC] constify mmc_host_ops

3 files changed, 93 insertions, 91 deletions

diff --git a/drivers/mmc/imxmmc.c b/drivers/mmc/imxmmc.c
index 7ca9e95..fb6565b 100644
--- a/drivers/mmc/imxmmc.c
+++ b/drivers/mmc/imxmmc.c
@@ -91,6 +91,8 @@ struct imxmci_host {
 	int			dma_allocated;
 
 	unsigned char		actual_bus_width;
+
+	int			prev_cmd_code;
 };
 
 #define IMXMCI_PEND_IRQ_b	0
@@ -248,16 +250,14 @@ static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data)
 	 * partial FIFO fills and reads. The length has to be rounded up to burst size multiple.
 	 * This is required for SCR read at least.
 	 */
-	if (datasz < 64) {
+	if (datasz < 512) {
 		host->dma_size = datasz;
 		if (data->flags & MMC_DATA_READ) {
 			host->dma_dir = DMA_FROM_DEVICE;
 
 			/* Hack to enable read SCR */
-			if(datasz < 16) {
-				MMC_NOB = 1;
-				MMC_BLK_LEN = 16;
-			}
+			MMC_NOB = 1;
+			MMC_BLK_LEN = 512;
 		} else {
 			host->dma_dir = DMA_TO_DEVICE;
 		}
@@ -409,6 +409,9 @@ static void imxmci_finish_request(struct imxmci_host *host, struct mmc_request *
 
 	spin_unlock_irqrestore(&host->lock, flags);
 
+	if(req && req->cmd)
+		host->prev_cmd_code = req->cmd->opcode;
+
 	host->req = NULL;
 	host->cmd = NULL;
 	host->data = NULL;
@@ -553,7 +556,6 @@ static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
 {
 	int i;
 	int burst_len;
-	int flush_len;
 	int trans_done = 0;
 	unsigned int stat = *pstat;
 
@@ -566,44 +568,43 @@ static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
 	dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data running STATUS = 0x%x\n",
 		stat);
 
+	udelay(20);	/* required for clocks < 8MHz*/
+
 	if(host->dma_dir == DMA_FROM_DEVICE) {
 		imxmci_busy_wait_for_status(host, &stat,
 				STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE,
-				20, "imxmci_cpu_driven_data read");
+				50, "imxmci_cpu_driven_data read");
 
 		while((stat & (STATUS_APPL_BUFF_FF |  STATUS_DATA_TRANS_DONE)) &&
-		      (host->data_cnt < host->dma_size)) {
-			if(burst_len >= host->dma_size - host->data_cnt) {
-				flush_len = burst_len;
-				burst_len = host->dma_size - host->data_cnt;
-				flush_len -= burst_len;
-				host->data_cnt = host->dma_size;
-				trans_done = 1;
-			} else {
-				flush_len = 0;
-				host->data_cnt += burst_len;
-			}
+		      (host->data_cnt < 512)) {
+
+			udelay(20);	/* required for clocks < 8MHz*/
 
 			for(i = burst_len; i>=2 ; i-=2) {
-				*(host->data_ptr++) = MMC_BUFFER_ACCESS;
-				udelay(20);	/* required for clocks < 8MHz*/
+				u16 data;
+				data = MMC_BUFFER_ACCESS;
+				udelay(10);	/* required for clocks < 8MHz*/
+				if(host->data_cnt+2 <= host->dma_size) {
+					*(host->data_ptr++) = data;
+				} else {
+					if(host->data_cnt < host->dma_size)
+						*(u8*)(host->data_ptr) = data;
+				}
+				host->data_cnt += 2;
 			}
 
-			if(i == 1)
-				*(u8*)(host->data_ptr) = MMC_BUFFER_ACCESS;
-
 			stat = MMC_STATUS;
 
-			/* Flush extra bytes from FIFO */
-			while(flush_len && !(stat & STATUS_DATA_TRANS_DONE)){
-				i = MMC_BUFFER_ACCESS;
-				stat = MMC_STATUS;
-				stat &= ~STATUS_CRC_READ_ERR; /* Stupid but required there */
-			}
-
-			dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read burst %d STATUS = 0x%x\n",
-				burst_len, stat);
+			dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read %d burst %d STATUS = 0x%x\n",
+				host->data_cnt, burst_len, stat);
 		}
+
+		if((stat & STATUS_DATA_TRANS_DONE) && (host->data_cnt >= 512))
+			trans_done = 1;
+
+		if(host->dma_size & 0x1ff)
+			stat &= ~STATUS_CRC_READ_ERR;
+
 	} else {
 		imxmci_busy_wait_for_status(host, &stat,
 				STATUS_APPL_BUFF_FE,
@@ -692,8 +693,8 @@ static void imxmci_tasklet_fnc(unsigned long data)
 		       what, stat, MMC_INT_MASK);
 		dev_err(mmc_dev(host->mmc), "CMD_DAT_CONT = 0x%04x, MMC_BLK_LEN = 0x%04x, MMC_NOB = 0x%04x, DMA_CCR = 0x%08x\n",
 		       MMC_CMD_DAT_CONT, MMC_BLK_LEN, MMC_NOB, CCR(host->dma));
-		dev_err(mmc_dev(host->mmc), "CMD%d, bus %d-bit, dma_size = 0x%x\n",
-		       host->cmd?host->cmd->opcode:0, 1<<host->actual_bus_width, host->dma_size);
+		dev_err(mmc_dev(host->mmc), "CMD%d, prevCMD%d, bus %d-bit, dma_size = 0x%x\n",
+		       host->cmd?host->cmd->opcode:0, host->prev_cmd_code, 1<<host->actual_bus_width, host->dma_size);
 	}
 
 	if(!host->present || timeout)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 33525bd..74eaaee 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -247,6 +247,55 @@ int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
 
 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
 
+/**
+ *	mmc_set_data_timeout - set the timeout for a data command
+ *	@data: data phase for command
+ *	@card: the MMC card associated with the data transfer
+ *	@write: flag to differentiate reads from writes
+ */
+void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
+			  int write)
+{
+	unsigned int mult;
+
+	/*
+	 * SD cards use a 100 multiplier rather than 10
+	 */
+	mult = mmc_card_sd(card) ? 100 : 10;
+
+	/*
+	 * Scale up the multiplier (and therefore the timeout) by
+	 * the r2w factor for writes.
+	 */
+	if (write)
+		mult <<= card->csd.r2w_factor;
+
+	data->timeout_ns = card->csd.tacc_ns * mult;
+	data->timeout_clks = card->csd.tacc_clks * mult;
+
+	/*
+	 * SD cards also have an upper limit on the timeout.
+	 */
+	if (mmc_card_sd(card)) {
+		unsigned int timeout_us, limit_us;
+
+		timeout_us = data->timeout_ns / 1000;
+		timeout_us += data->timeout_clks * 1000 /
+			(card->host->ios.clock / 1000);
+
+		if (write)
+			limit_us = 250000;
+		else
+			limit_us = 100000;
+
+		if (timeout_us > limit_us) {
+			data->timeout_ns = limit_us * 1000;
+			data->timeout_clks = 0;
+		}
+	}
+}
+EXPORT_SYMBOL(mmc_set_data_timeout);
+
 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card);
 
 /**
@@ -908,11 +957,9 @@ static void mmc_read_scrs(struct mmc_host *host)
 {
 	int err;
 	struct mmc_card *card;
-
 	struct mmc_request mrq;
 	struct mmc_command cmd;
 	struct mmc_data data;
-
 	struct scatterlist sg;
 
 	list_for_each_entry(card, &host->cards, node) {
@@ -947,8 +994,8 @@ static void mmc_read_scrs(struct mmc_host *host)
 
 		memset(&data, 0, sizeof(struct mmc_data));
 
-		data.timeout_ns = card->csd.tacc_ns * 10;
-		data.timeout_clks = card->csd.tacc_clks * 10;
+		mmc_set_data_timeout(&data, card, 0);
+
 		data.blksz_bits = 3;
 		data.blksz = 1 << 3;
 		data.blocks = 1;
diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
index 115cc21..a0e0dad 100644
--- a/drivers/mmc/mmc_block.c
+++ b/drivers/mmc/mmc_block.c
@@ -30,6 +30,7 @@
 #include <linux/mutex.h>
 
 #include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
 #include <linux/mmc/protocol.h>
 
 #include <asm/system.h>
@@ -171,8 +172,6 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 
 		brq.cmd.arg = req->sector << 9;
 		brq.cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
-		brq.data.timeout_ns = card->csd.tacc_ns * 10;
-		brq.data.timeout_clks = card->csd.tacc_clks * 10;
 		brq.data.blksz_bits = md->block_bits;
 		brq.data.blksz = 1 << md->block_bits;
 		brq.data.blocks = req->nr_sectors >> (md->block_bits - 9);
@@ -180,6 +179,8 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 		brq.stop.arg = 0;
 		brq.stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
 
+		mmc_set_data_timeout(&brq.data, card, rq_data_dir(req) != READ);
+
 		if (rq_data_dir(req) == READ) {
 			brq.cmd.opcode = brq.data.blocks > 1 ? MMC_READ_MULTIPLE_BLOCK : MMC_READ_SINGLE_BLOCK;
 			brq.data.flags |= MMC_DATA_READ;
@@ -187,12 +188,6 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 			brq.cmd.opcode = MMC_WRITE_BLOCK;
 			brq.data.flags |= MMC_DATA_WRITE;
 			brq.data.blocks = 1;
-
-			/*
-			 * Scale up the timeout by the r2w factor
-			 */
-			brq.data.timeout_ns <<= card->csd.r2w_factor;
-			brq.data.timeout_clks <<= card->csd.r2w_factor;
 		}
 
 		if (brq.data.blocks > 1) {
@@ -324,52 +319,11 @@ static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
 	md->read_only = mmc_blk_readonly(card);
 
 	/*
-	 * Figure out a workable block size.  MMC cards have:
-	 *  - two block sizes, one for read and one for write.
-	 *  - may support partial reads and/or writes
-	 *    (allows block sizes smaller than specified)
-	 */
-	md->block_bits = card->csd.read_blkbits;
-	if (card->csd.write_blkbits != card->csd.read_blkbits) {
-		if (card->csd.write_blkbits < card->csd.read_blkbits &&
-		    card->csd.read_partial) {
-			/*
-			 * write block size is smaller than read block
-			 * size, but we support partial reads, so choose
-			 * the smaller write block size.
-			 */
-			md->block_bits = card->csd.write_blkbits;
-		} else if (card->csd.write_blkbits > card->csd.read_blkbits &&
-			   card->csd.write_partial) {
-			/*
-			 * read block size is smaller than write block
-			 * size, but we support partial writes.  Use read
-			 * block size.
-			 */
-		} else {
-			/*
-			 * We don't support this configuration for writes.
-			 */
-			printk(KERN_ERR "%s: unable to select block size for "
-				"writing (rb%u wb%u rp%u wp%u)\n",
-				mmc_card_id(card),
-				1 << card->csd.read_blkbits,
-				1 << card->csd.write_blkbits,
-				card->csd.read_partial,
-				card->csd.write_partial);
-			md->read_only = 1;
-		}
-	}
-
-	/*
-	 * Refuse to allow block sizes smaller than 512 bytes.
+	 * Both SD and MMC specifications state (although a bit
+	 * unclearly in the MMC case) that a block size of 512
+	 * bytes must always be supported by the card.
 	 */
-	if (md->block_bits < 9) {
-		printk(KERN_ERR "%s: unable to support block size %u\n",
-			mmc_card_id(card), 1 << md->block_bits);
-		ret = -EINVAL;
-		goto err_kfree;
-	}
+	md->block_bits = 9;
 
 	md->disk = alloc_disk(1 << MMC_SHIFT);
 	if (md->disk == NULL) {