From 26d49fe7195385f2f1e406feddb01c16b53e77b6 Mon Sep 17 00:00:00 2001 From: Robert Jarzmik Date: Thu, 5 Nov 2015 20:46:53 +0100 Subject: mmc: pxamci: fix read-only gpio detection polarity The commit converting pxamci to slot-gpio API inverted the logic of the read-only gpio. Fix it by inverting the logic again. Fixes: fd546ee6a7dc ("mmc: pxamci: fix card detect with slot-gpio API") Signed-off-by: Robert Jarzmik Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson --- drivers/mmc/host/pxamci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c index 8cadd74e8407..ce08896b9d69 100644 --- a/drivers/mmc/host/pxamci.c +++ b/drivers/mmc/host/pxamci.c @@ -805,7 +805,7 @@ static int pxamci_probe(struct platform_device *pdev) goto out; } else { mmc->caps |= host->pdata->gpio_card_ro_invert ? - MMC_CAP2_RO_ACTIVE_HIGH : 0; + 0 : MMC_CAP2_RO_ACTIVE_HIGH; } if (gpio_is_valid(gpio_cd)) -- cgit v1.2.3-58-ga151 From 1815e61b1a7efe81017a883e817292daf7d2f922 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Wed, 28 Oct 2015 14:25:40 +0200 Subject: mmc: mmc: Improve reliability of mmc_select_hs200() Currently mmc_select_hs200() uses __mmc_switch() which checks the success of the switch to HS200 mode using CMD13 (SEND_STATUS). The problem is that it does that using the timing settings of legacy mode. That is prone to error, not least because the timing parameters for legacy mode are tighter than the timing parameters for HS200 mode. In the case when CMD13 polling is used (i.e. not MMC_CAP_WAIT_WHILE_BUSY) with the switch command, it must be assumed that using different modes on the card and host must work. However in the case when CMD13 polling is not used (i.e. MMC_CAP_WAIT_WHILE_BUSY) mmc_select_hs200() can be made more reliable by setting the host to the correct timing before sending CMD13. This patch does that. A complication is that the caller, mmc_select_timing(), will ignore a switch error (indicated by -EBADMSG), assume the old mode is valid and continue, so the old timing must be restored in that case. Signed-off-by: Adrian Hunter Cc: # 4.2+ Tested-by: Alim Akhtar Signed-off-by: Ulf Hansson --- drivers/mmc/core/mmc.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index c793fda27321..2cef40ce9851 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1219,6 +1219,8 @@ static void mmc_select_driver_type(struct mmc_card *card) static int mmc_select_hs200(struct mmc_card *card) { struct mmc_host *host = card->host; + bool send_status = true; + unsigned int old_timing; int err = -EINVAL; u8 val; @@ -1234,6 +1236,9 @@ static int mmc_select_hs200(struct mmc_card *card) mmc_select_driver_type(card); + if (host->caps & MMC_CAP_WAIT_WHILE_BUSY) + send_status = false; + /* * Set the bus width(4 or 8) with host's support and * switch to HS200 mode if bus width is set successfully. @@ -1245,11 +1250,25 @@ static int mmc_select_hs200(struct mmc_card *card) err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, val, card->ext_csd.generic_cmd6_time, - true, true, true); - if (!err) - mmc_set_timing(host, MMC_TIMING_MMC_HS200); + true, send_status, true); + if (err) + goto err; + old_timing = host->ios.timing; + mmc_set_timing(host, MMC_TIMING_MMC_HS200); + if (!send_status) { + err = mmc_switch_status(card); + /* + * mmc_select_timing() assumes timing has not changed if + * it is a switch error. + */ + if (err == -EBADMSG) + mmc_set_timing(host, old_timing); + } } err: + if (err) + pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host), + __func__, err); return err; } -- cgit v1.2.3-58-ga151 From 51b12f7764fa8bb464cbd0f7bbd3a408d21ade16 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Wed, 28 Oct 2015 14:25:41 +0200 Subject: mmc: mmc: Fix HS setting in mmc_select_hs400() mmc_select_hs400() begins with the card and host in HS200 mode. Therefore, any commands sent to the card should use HS200 timing. It is incorrect to set the host to High Speed (HS) timing before sending the switch command. Doing so is unreliable because the timing parameters for HS mode are tighter than the timing parameters for HS200 mode. Thus the HS timings should be set only after the card has switched mode. However, it is not unreasonable first to reduce the frequency to the HS mode frequency, which should make the switch command and subsequent CMD13 commands more reliable. This patch does that. Signed-off-by: Adrian Hunter Cc: # 4.2+ Tested-by: Alim Akhtar Signed-off-by: Ulf Hansson --- drivers/mmc/core/mmc.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) (limited to 'drivers') diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 2cef40ce9851..14fb767ee8dd 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1043,6 +1043,7 @@ static int mmc_select_hs_ddr(struct mmc_card *card) static int mmc_select_hs400(struct mmc_card *card) { struct mmc_host *host = card->host; + unsigned int max_dtr; int err = 0; u8 val; @@ -1053,13 +1054,11 @@ static int mmc_select_hs400(struct mmc_card *card) host->ios.bus_width == MMC_BUS_WIDTH_8)) return 0; - /* - * Before switching to dual data rate operation for HS400, - * it is required to convert from HS200 mode to HS mode. - */ - mmc_set_timing(card->host, MMC_TIMING_MMC_HS); - mmc_set_bus_speed(card); + /* Reduce frequency to HS frequency */ + max_dtr = card->ext_csd.hs_max_dtr; + mmc_set_clock(host, max_dtr); + /* Switch card to HS mode */ val = EXT_CSD_TIMING_HS | card->drive_strength << EXT_CSD_DRV_STR_SHIFT; err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, @@ -1072,6 +1071,9 @@ static int mmc_select_hs400(struct mmc_card *card) return err; } + /* Set host controller to HS timing */ + mmc_set_timing(card->host, MMC_TIMING_MMC_HS); + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH, EXT_CSD_DDR_BUS_WIDTH_8, -- cgit v1.2.3-58-ga151 From 974007aaf240aa195b31c34cfdb013524a2dcfca Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Wed, 28 Oct 2015 14:25:42 +0200 Subject: mmc: mmc: Move mmc_switch_status() Move the mmc_switch_status() function in preparation for calling it in mmc_select_hs400(). Signed-off-by: Adrian Hunter Cc: # 4.2+ Tested-by: Alim Akhtar Signed-off-by: Ulf Hansson --- drivers/mmc/core/mmc.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) (limited to 'drivers') diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 14fb767ee8dd..5884c79346da 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1040,6 +1040,19 @@ static int mmc_select_hs_ddr(struct mmc_card *card) return err; } +/* Caller must hold re-tuning */ +static int mmc_switch_status(struct mmc_card *card) +{ + u32 status; + int err; + + err = mmc_send_status(card, &status); + if (err) + return err; + + return mmc_switch_status_error(card->host, status); +} + static int mmc_select_hs400(struct mmc_card *card) { struct mmc_host *host = card->host; @@ -1107,19 +1120,6 @@ int mmc_hs200_to_hs400(struct mmc_card *card) return mmc_select_hs400(card); } -/* Caller must hold re-tuning */ -static int mmc_switch_status(struct mmc_card *card) -{ - u32 status; - int err; - - err = mmc_send_status(card, &status); - if (err) - return err; - - return mmc_switch_status_error(card->host, status); -} - int mmc_hs400_to_hs200(struct mmc_card *card) { struct mmc_host *host = card->host; -- cgit v1.2.3-58-ga151 From d23029332c3d51fb5ac117ba5cde4dc0a3ec3fa6 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Wed, 28 Oct 2015 14:25:43 +0200 Subject: mmc: mmc: Improve reliability of mmc_select_hs400() mmc_select_hs400() calls __mmc_switch() which checks the switch is successful using CMD13 (SEND_STATUS). The problem is that it does that using the timing settings of the previous mode. That is prone to error, especially when switching from HS to HS400 because the timing parameters for HS mode are tighter than the timing parameters for HS400 mode. In the case when CMD13 polling is used (i.e. not MMC_CAP_WAIT_WHILE_BUSY) with the switch command, it must be assumed that using different modes on the card and host must work. However in the case when CMD13 polling is not used (i.e. MMC_CAP_WAIT_WHILE_BUSY) mmc_select_hs400() can be made more reliable by setting the host to the correct timing before sending CMD13. This patch does that. Signed-off-by: Adrian Hunter Cc: # 4.2+ Tested-by: Alim Akhtar Signed-off-by: Ulf Hansson --- drivers/mmc/core/mmc.c | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 5884c79346da..3a9a79ec4343 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1056,6 +1056,7 @@ static int mmc_switch_status(struct mmc_card *card) static int mmc_select_hs400(struct mmc_card *card) { struct mmc_host *host = card->host; + bool send_status = true; unsigned int max_dtr; int err = 0; u8 val; @@ -1067,6 +1068,9 @@ static int mmc_select_hs400(struct mmc_card *card) host->ios.bus_width == MMC_BUS_WIDTH_8)) return 0; + if (host->caps & MMC_CAP_WAIT_WHILE_BUSY) + send_status = false; + /* Reduce frequency to HS frequency */ max_dtr = card->ext_csd.hs_max_dtr; mmc_set_clock(host, max_dtr); @@ -1077,7 +1081,7 @@ static int mmc_select_hs400(struct mmc_card *card) err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, val, card->ext_csd.generic_cmd6_time, - true, true, true); + true, send_status, true); if (err) { pr_err("%s: switch to high-speed from hs200 failed, err:%d\n", mmc_hostname(host), err); @@ -1087,6 +1091,13 @@ static int mmc_select_hs400(struct mmc_card *card) /* Set host controller to HS timing */ mmc_set_timing(card->host, MMC_TIMING_MMC_HS); + if (!send_status) { + err = mmc_switch_status(card); + if (err) + goto out_err; + } + + /* Switch card to DDR */ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH, EXT_CSD_DDR_BUS_WIDTH_8, @@ -1097,22 +1108,35 @@ static int mmc_select_hs400(struct mmc_card *card) return err; } + /* Switch card to HS400 */ val = EXT_CSD_TIMING_HS400 | card->drive_strength << EXT_CSD_DRV_STR_SHIFT; err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, val, card->ext_csd.generic_cmd6_time, - true, true, true); + true, send_status, true); if (err) { pr_err("%s: switch to hs400 failed, err:%d\n", mmc_hostname(host), err); return err; } + /* Set host controller to HS400 timing and frequency */ mmc_set_timing(host, MMC_TIMING_MMC_HS400); mmc_set_bus_speed(card); + if (!send_status) { + err = mmc_switch_status(card); + if (err) + goto out_err; + } + return 0; + +out_err: + pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host), + __func__, err); + return err; } int mmc_hs200_to_hs400(struct mmc_card *card) -- cgit v1.2.3-58-ga151 From 62d494ca2773563e333e670cd18378705dad32d4 Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Fri, 6 Nov 2015 12:22:08 +0100 Subject: mmc: mediatek: Preinitialize delay_phase in get_best_delay() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit drivers/mmc/host/mtk-sd.c: In function ‘get_best_delay’: drivers/mmc/host/mtk-sd.c:1284: warning: ‘delay_phase.start’ is used uninitialized in this function drivers/mmc/host/mtk-sd.c:1284: warning: ‘delay_phase.maxlen’ is used uninitialized in this function If delay is zero, these fields are indeed not initialized. Let the compiler preinitialize the whole struct to fix this. Signed-off-by: Geert Uytterhoeven Signed-off-by: Ulf Hansson --- drivers/mmc/host/mtk-sd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c index 39568cc29a2a..33dfd7e72516 100644 --- a/drivers/mmc/host/mtk-sd.c +++ b/drivers/mmc/host/mtk-sd.c @@ -1276,7 +1276,7 @@ static struct msdc_delay_phase get_best_delay(struct msdc_host *host, u32 delay) int start = 0, len = 0; int start_final = 0, len_final = 0; u8 final_phase = 0xff; - struct msdc_delay_phase delay_phase; + struct msdc_delay_phase delay_phase = { 0, }; if (delay == 0) { dev_err(host->dev, "phase error: [map:%x]\n", delay); -- cgit v1.2.3-58-ga151 From 3d35877294005911da54c36e2ab4d7b72d5e9331 Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Mon, 9 Nov 2015 10:36:01 +0100 Subject: mmc: MMC_GOLDFISH should depend on HAS_DMA If NO_DMA=y: ERROR: dma_unmap_sg [drivers/mmc/host/android-goldfish.ko] undefined! ERROR: dma_alloc_coherent [drivers/mmc/host/android-goldfish.ko] undefined! ERROR: dma_map_sg [drivers/mmc/host/android-goldfish.ko] undefined! ERROR: dma_free_coherent [drivers/mmc/host/android-goldfish.ko] undefined! Add a dependency on HAS_DMA to fix this. Signed-off-by: Geert Uytterhoeven Signed-off-by: Ulf Hansson --- drivers/mmc/host/Kconfig | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers') diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index af71de5fda3b..1dee533634c9 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -473,6 +473,7 @@ config MMC_DAVINCI config MMC_GOLDFISH tristate "goldfish qemu Multimedia Card Interface support" + depends on HAS_DMA depends on GOLDFISH || COMPILE_TEST help This selects the Goldfish Multimedia card Interface emulation -- cgit v1.2.3-58-ga151 From d3df0465db00cf4ed9f90d0bfc3b827d32b9c796 Mon Sep 17 00:00:00 2001 From: Luca Porzio Date: Fri, 6 Nov 2015 15:12:26 +0000 Subject: mmc: remove bondage between REQ_META and reliable write Anytime a write operation is performed with Reliable Write flag enabled, the eMMC device is enforced to bypass the cache and do a write to the underling NVM device by Jedec specification; this causes a performance penalty since write operations can't be optimized by the device cache. In our tests, we replayed a typical mobile daily trace pattern and found ~9% overall time reduction in trace replay by using this patch. Also the write ops within 4KB~64KB chunk size range get a 40~60% performance improvement by using the patch (as this range of write chunks are the ones affected by REQ_META). This patch has been discussed in the Mobile & Embedded Linux Storage Forum and it's the results of feedbacks from many people. We also checked with fsdevl and f2fs mailing list developers that this change in the usage of REQ_META is not affecting FS behavior and we got positive feedbacks. Reporting here the feedbacks: http://comments.gmane.org/gmane.linux.file-systems/97219 http://thread.gmane.org/gmane.linux.file-systems.f2fs/3178/focus=3183 Signed-off-by: Bruce Ford Signed-off-by: Luca Porzio Fixes: ce39f9d17c14 ("mmc: support packed write command for eMMC4.5 devices") Signed-off-by: Ulf Hansson --- drivers/mmc/card/block.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) (limited to 'drivers') diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 23b6c8e8701c..d8486168415a 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -65,8 +65,7 @@ MODULE_ALIAS("mmc:block"); #define MMC_SANITIZE_REQ_TIMEOUT 240000 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16) -#define mmc_req_rel_wr(req) (((req->cmd_flags & REQ_FUA) || \ - (req->cmd_flags & REQ_META)) && \ +#define mmc_req_rel_wr(req) ((req->cmd_flags & REQ_FUA) && \ (rq_data_dir(req) == WRITE)) #define PACKED_CMD_VER 0x01 #define PACKED_CMD_WR 0x02 @@ -1467,13 +1466,9 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq, /* * Reliable writes are used to implement Forced Unit Access and - * REQ_META accesses, and are supported only on MMCs. - * - * XXX: this really needs a good explanation of why REQ_META - * is treated special. + * are supported only on MMCs. */ - bool do_rel_wr = ((req->cmd_flags & REQ_FUA) || - (req->cmd_flags & REQ_META)) && + bool do_rel_wr = (req->cmd_flags & REQ_FUA) && (rq_data_dir(req) == WRITE) && (md->flags & MMC_BLK_REL_WR); -- cgit v1.2.3-58-ga151