diff options
Diffstat (limited to 'target/linux/goldfish/patches-2.6.30/0099-mmc-mmcblk-Add-new-feature-CONFIG_MMC_BLOCK_PARAN.patch')
| -rw-r--r-- | target/linux/goldfish/patches-2.6.30/0099-mmc-mmcblk-Add-new-feature-CONFIG_MMC_BLOCK_PARAN.patch | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/target/linux/goldfish/patches-2.6.30/0099-mmc-mmcblk-Add-new-feature-CONFIG_MMC_BLOCK_PARAN.patch b/target/linux/goldfish/patches-2.6.30/0099-mmc-mmcblk-Add-new-feature-CONFIG_MMC_BLOCK_PARAN.patch new file mode 100644 index 000000000..78e23780f --- /dev/null +++ b/target/linux/goldfish/patches-2.6.30/0099-mmc-mmcblk-Add-new-feature-CONFIG_MMC_BLOCK_PARAN.patch @@ -0,0 +1,104 @@ +From 5ca694dfd981a371e9b18cdd4a89c002ffaccbc5 Mon Sep 17 00:00:00 2001 +From: San Mehat <san@android.com> +Date: Wed, 3 Dec 2008 10:22:59 -0800 +Subject: [PATCH 099/134] mmc: mmcblk: Add new feature 'CONFIG_MMC_BLOCK_PARANOID_RESUME' + + With this feature enabled, mmcblk will check the card-status before issuing +a transaction *only* after being resumed. This protectes us from issuing +transactions before the sdcard is ready (which can occur if the host driver +deferrs mmc_resume_host() to reduce resume latency) + +Signed-off-by: San Mehat <san@android.com> +--- + drivers/mmc/card/Kconfig | 7 +++++++ + drivers/mmc/card/block.c | 3 +++ + drivers/mmc/card/queue.c | 28 ++++++++++++++++++++++++++++ + drivers/mmc/card/queue.h | 3 +++ + 4 files changed, 41 insertions(+), 0 deletions(-) + +--- a/drivers/mmc/card/Kconfig ++++ b/drivers/mmc/card/Kconfig +@@ -32,6 +32,13 @@ config MMC_BLOCK_BOUNCE + + If unsure, say Y here. + ++config MMC_BLOCK_PARANOID_RESUME ++ bool "Check card status on resume" ++ depends on MMC_BLOCK ++ default y ++ help ++ Nohelp ++ + config SDIO_UART + tristate "SDIO UART/GPS class support" + help +--- a/drivers/mmc/card/block.c ++++ b/drivers/mmc/card/block.c +@@ -643,6 +643,9 @@ static int mmc_blk_resume(struct mmc_car + + if (md) { + mmc_blk_set_blksize(md, card); ++#ifdef CONFIG_MMC_BLOCK_PARANOID_RESUME ++ md->queue.check_status = 1; ++#endif + mmc_queue_resume(&md->queue); + } + return 0; +--- a/drivers/mmc/card/queue.c ++++ b/drivers/mmc/card/queue.c +@@ -14,7 +14,9 @@ + #include <linux/freezer.h> + #include <linux/kthread.h> + #include <linux/scatterlist.h> ++#include <linux/delay.h> + ++#include <linux/mmc/mmc.h> + #include <linux/mmc/card.h> + #include <linux/mmc/host.h> + #include "queue.h" +@@ -70,7 +72,33 @@ static int mmc_queue_thread(void *d) + continue; + } + set_current_state(TASK_RUNNING); ++#ifdef CONFIG_MMC_BLOCK_PARANOID_RESUME ++ if (mq->check_status) { ++ struct mmc_command cmd; + ++ do { ++ int err; ++ ++ cmd.opcode = MMC_SEND_STATUS; ++ cmd.arg = mq->card->rca << 16; ++ cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; ++ ++ mmc_claim_host(mq->card->host); ++ err = mmc_wait_for_cmd(mq->card->host, &cmd, 5); ++ mmc_release_host(mq->card->host); ++ ++ if (err) { ++ printk(KERN_ERR "%s: failed to get status (%d)\n", ++ __func__, err); ++ msleep(5); ++ continue; ++ } ++ printk(KERN_DEBUG "%s: status 0x%.8x\n", __func__, cmd.resp[0]); ++ } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || ++ (R1_CURRENT_STATE(cmd.resp[0]) == 7)); ++ mq->check_status = 0; ++ } ++#endif + mq->issue_fn(mq, req); + } while (1); + up(&mq->thread_sem); +--- a/drivers/mmc/card/queue.h ++++ b/drivers/mmc/card/queue.h +@@ -17,6 +17,9 @@ struct mmc_queue { + char *bounce_buf; + struct scatterlist *bounce_sg; + unsigned int bounce_sg_len; ++#ifdef CONFIG_MMC_BLOCK_PARANOID_RESUME ++ int check_status; ++#endif + }; + + extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *); |