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