diff options
Diffstat (limited to 'meta/packages/linux/linux-openzaurus-2.6.16/rmk-mmc1.patch')
| -rw-r--r-- | meta/packages/linux/linux-openzaurus-2.6.16/rmk-mmc1.patch | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/meta/packages/linux/linux-openzaurus-2.6.16/rmk-mmc1.patch b/meta/packages/linux/linux-openzaurus-2.6.16/rmk-mmc1.patch new file mode 100644 index 0000000000..054b48d28d --- /dev/null +++ b/meta/packages/linux/linux-openzaurus-2.6.16/rmk-mmc1.patch @@ -0,0 +1,61 @@ + +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 <rmk+kernel@arm.linux.org.uk> + +diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c +--- a/drivers/mmc/mmc.c ++++ b/drivers/mmc/mmc.c +@@ -549,6 +549,7 @@ static void mmc_decode_csd(struct mmc_ca + 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_ca + 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 +--- a/drivers/mmc/mmc_block.c ++++ b/drivers/mmc/mmc_block.c +@@ -187,6 +187,12 @@ static int mmc_blk_issue_rq(struct mmc_q + 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 +--- 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; + + +------------------------------------------------------------------- +List admin: http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm-kernel +FAQ: http://www.arm.linux.org.uk/mailinglists/faq.php +Etiquette: http://www.arm.linux.org.uk/mailinglists/etiquette.php + |