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authorPierre Ossman <drzeus@drzeus.cx>2006-06-18 08:34:37 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-09-07 08:18:40 -0400
commit385e3227d4d83ab13d7767c4bb3593b0256bf246 (patch)
tree91f532e07753c44a905116f5a7d0e3bdcfca7f0a /drivers/mmc/mmc_block.c
parentf57b225e432d80ee46f48536cc55ea6cf62c5570 (diff)
[MMC] Fix SD timeout calculation
Secure Digital cards use a different algorithm to calculate the timeout for data transfers. Using the MMC one works often, but not always. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mmc/mmc_block.c')
-rw-r--r--drivers/mmc/mmc_block.c44
1 files changed, 36 insertions, 8 deletions
diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
index 115cc21094b9..515fb227eba7 100644
--- a/drivers/mmc/mmc_block.c
+++ b/drivers/mmc/mmc_block.c
@@ -30,6 +30,7 @@
30#include <linux/mutex.h> 30#include <linux/mutex.h>
31 31
32#include <linux/mmc/card.h> 32#include <linux/mmc/card.h>
33#include <linux/mmc/host.h>
33#include <linux/mmc/protocol.h> 34#include <linux/mmc/protocol.h>
34 35
35#include <asm/system.h> 36#include <asm/system.h>
@@ -171,8 +172,6 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
171 172
172 brq.cmd.arg = req->sector << 9; 173 brq.cmd.arg = req->sector << 9;
173 brq.cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; 174 brq.cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
174 brq.data.timeout_ns = card->csd.tacc_ns * 10;
175 brq.data.timeout_clks = card->csd.tacc_clks * 10;
176 brq.data.blksz_bits = md->block_bits; 175 brq.data.blksz_bits = md->block_bits;
177 brq.data.blksz = 1 << md->block_bits; 176 brq.data.blksz = 1 << md->block_bits;
178 brq.data.blocks = req->nr_sectors >> (md->block_bits - 9); 177 brq.data.blocks = req->nr_sectors >> (md->block_bits - 9);
@@ -180,6 +179,41 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
180 brq.stop.arg = 0; 179 brq.stop.arg = 0;
181 brq.stop.flags = MMC_RSP_R1B | MMC_CMD_AC; 180 brq.stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
182 181
182 brq.data.timeout_ns = card->csd.tacc_ns * 10;
183 brq.data.timeout_clks = card->csd.tacc_clks * 10;
184
185 /*
186 * Scale up the timeout by the r2w factor
187 */
188 if (rq_data_dir(req) == WRITE) {
189 brq.data.timeout_ns <<= card->csd.r2w_factor;
190 brq.data.timeout_clks <<= card->csd.r2w_factor;
191 }
192
193 /*
194 * SD cards use a 100 multiplier and has a upper limit
195 */
196 if (mmc_card_sd(card)) {
197 unsigned int limit_us, timeout_us;
198
199 brq.data.timeout_ns *= 10;
200 brq.data.timeout_clks *= 10;
201
202 if (rq_data_dir(req) == READ)
203 limit_us = 100000;
204 else
205 limit_us = 250000;
206
207 timeout_us = brq.data.timeout_ns / 1000;
208 timeout_us += brq.data.timeout_clks * 1000 /
209 (card->host->ios.clock / 1000);
210
211 if (timeout_us > limit_us) {
212 brq.data.timeout_ns = limit_us * 1000;
213 brq.data.timeout_clks = 0;
214 }
215 }
216
183 if (rq_data_dir(req) == READ) { 217 if (rq_data_dir(req) == READ) {
184 brq.cmd.opcode = brq.data.blocks > 1 ? MMC_READ_MULTIPLE_BLOCK : MMC_READ_SINGLE_BLOCK; 218 brq.cmd.opcode = brq.data.blocks > 1 ? MMC_READ_MULTIPLE_BLOCK : MMC_READ_SINGLE_BLOCK;
185 brq.data.flags |= MMC_DATA_READ; 219 brq.data.flags |= MMC_DATA_READ;
@@ -187,12 +221,6 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
187 brq.cmd.opcode = MMC_WRITE_BLOCK; 221 brq.cmd.opcode = MMC_WRITE_BLOCK;
188 brq.data.flags |= MMC_DATA_WRITE; 222 brq.data.flags |= MMC_DATA_WRITE;
189 brq.data.blocks = 1; 223 brq.data.blocks = 1;
190
191 /*
192 * Scale up the timeout by the r2w factor
193 */
194 brq.data.timeout_ns <<= card->csd.r2w_factor;
195 brq.data.timeout_clks <<= card->csd.r2w_factor;
196 } 224 }
197 225
198 if (brq.data.blocks > 1) { 226 if (brq.data.blocks > 1) {