From 37be4e7809e0581db85387e126ae4da68c3d6286 Mon Sep 17 00:00:00 2001 From: Russell King Date: Tue, 2 May 2006 17:24:59 +0100 Subject: [PATCH] [MMC] extend data timeout for writes The CSD contains a "read2write factor" which determines the multiplier to be applied to the read timeout to obtain the write timeout. We were ignoring this parameter, resulting in the possibility for writes being timed out too early. Signed-off-by: Russell King --- drivers/mmc/mmc.c | 2 ++ drivers/mmc/mmc_block.c | 6 ++++++ include/linux/mmc/card.h | 1 + 3 files changed, 9 insertions(+) diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index da6ddd910f..05aa4d6b4f 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -549,6 +549,7 @@ static void mmc_decode_csd(struct mmc_card *card) csd->read_partial = UNSTUFF_BITS(resp, 79, 1); csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); + csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); csd->write_partial = UNSTUFF_BITS(resp, 21, 1); } else { @@ -583,6 +584,7 @@ static void mmc_decode_csd(struct mmc_card *card) csd->read_partial = UNSTUFF_BITS(resp, 79, 1); csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); + csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); csd->write_partial = UNSTUFF_BITS(resp, 21, 1); } diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c index 8eb2a2ede6..06bd1f4cb9 100644 --- a/drivers/mmc/mmc_block.c +++ b/drivers/mmc/mmc_block.c @@ -187,6 +187,12 @@ 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) { diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index 30dd978c1e..991a37382a 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -28,6 +28,7 @@ struct mmc_csd { unsigned short cmdclass; unsigned short tacc_clks; unsigned int tacc_ns; + unsigned int r2w_factor; unsigned int max_dtr; unsigned int read_blkbits; unsigned int write_blkbits; -- 2.39.5