From 950d56acce5d401f477b91d0177605b543d63d07 Mon Sep 17 00:00:00 2001 From: Jaehoon Chung Date: Mon, 17 Sep 2012 08:42:02 +0000 Subject: mmc: support BKOPS feature for eMMC Enable eMMC background operations (BKOPS) feature. If URGENT_BKOPS is set after a response, note that BKOPS are required. Immediately run BKOPS if required. Read/write operations should be requested during BKOPS(LEVEL-1), then issue HPI to interrupt the ongoing BKOPS and service the foreground operation. (This patch only controls the LEVEL2/3.) When repeating the writing 1GB data, at a certain time, performance is decreased. At that time, card triggers the Level-3 or Level-2. After running bkops, performance is recovered. Future considerations: * Check BKOPS_LEVEL=1 and start BKOPS in a preventive manner. * Interrupt ongoing BKOPS before powering off the card. * How do we get BKOPS_STATUS value (periodically send ext_csd command)? * If using periodic bkops, also consider runtime_pm control. Signed-off-by: Jaehoon Chung Signed-off-by: Kyungmin Park Signed-off-by: Konstantin Dorfman Reviewed-by: Maya Erez Signed-off-by: Chris Ball --- include/linux/mmc/core.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux/mmc/core.h') diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h index 1b431c728b9a..9b9cdafc7737 100644 --- a/include/linux/mmc/core.h +++ b/include/linux/mmc/core.h @@ -134,6 +134,8 @@ struct mmc_host; struct mmc_card; struct mmc_async_req; +extern int mmc_stop_bkops(struct mmc_card *); +extern int mmc_read_bkops_status(struct mmc_card *); extern struct mmc_async_req *mmc_start_req(struct mmc_host *, struct mmc_async_req *, int *); extern int mmc_interrupt_hpi(struct mmc_card *); @@ -142,6 +144,8 @@ extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int); extern int mmc_app_cmd(struct mmc_host *, struct mmc_card *); extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *, struct mmc_command *, int); +extern void mmc_start_bkops(struct mmc_card *card, bool from_exception); +extern int __mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int, bool); extern int mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int); #define MMC_ERASE_ARG 0x00000000 -- cgit v1.2.3