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b2db9c6743
linux/drivers/mmc/host
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Douglas Anderson b2db9c6743 mmc: sdhci-of-arasan: Don't power PHY w/ slow/no clock 
PHY intended to be used with the Arasan SDHCI 5.1 controller has trouble
turning on when the card clock is slow or off.  Strangely these problems
appear to show up consistently on some boards while other boards work
fine, but on the boards where it shows up the problem reproduces 100% of
the time and is quite consistent in its behavior.

These problems can be fixed by always making sure that we power on the
PHY (and turn on its DLL) when the card clock is faster than about 50
MHz.  Once on, we need to make sure that we never power down the PHY /
turn off its DLL until the clock is faster again.

We'll add logic for handling this into the sdhci-of-arasan driver.  Note
that right now the only user of a PHY in the sdhci-of-arasan driver is
arasan,sdhci-5.1.  It's presumed that all arasan,sdhci-5.1 PHY
implementations need this workaround, so the logic is only contingent on
having a PHY to control.  If future Arasan controllers don't have this
problem we can add code to decide if we want this flow or not.

Also note that we check for slow clocks by checking for <= 400 kHz
rather than checking for 50 MHz.  This keeps things the most consistent
and also means we can power the PHY on at max speed (where the DLL will
lock fastest).  Presumably anyone who intends to run with a card clock
of < 50 MHz and > 400 kHz will be running on a device where this problem
is fixed anyway.

I believe this brings some resolution to the problems reported before.
See the commit 6fc09244d7 ("mmc: sdhci-of-arasan: Revert: Always power
the PHY off/on when clock changes").

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-09-26 21:31:12 +02:00
..
android-goldfish.c mmc: android-goldfish: remove incorrect __iomem annotation 2015-09-01 14:19:11 +02:00
atmel-mci.c mmc: atmel-mci: Remove redundant runtime PM calls 2016-05-02 10:33:20 +02:00
au1xmmc.c mmc: host: drop owner assignment from platform_drivers 2014-10-20 16:20:56 +02:00
bfin_sdh.c mmc: bfin_sdh: remove the MMC_DATA_STREAM flag 2016-02-29 11:02:59 +01:00
cb710-mmc.c
cb710-mmc.h mmc: cb710: use to_platform_device() 2016-01-05 18:04:57 +01:00
davinci_mmc.c mmc: davinci: prepare clock 2016-05-02 10:33:19 +02:00
dw_mmc-exynos.c mmc: dw_mmc: exynos: fix the NULL pointer dereference error 2016-07-25 10:34:29 +02:00
dw_mmc-exynos.h mmc: dw_mmc: exynos: Support eMMC's HS400 mode 2015-03-23 14:13:28 +01:00
dw_mmc-k3.c mmc: dw_mmc: k3: add MMC_CAP_CMD23 2016-07-25 10:34:26 +02:00
dw_mmc-pci.c mmc: dw_mmc-pci: Remove superflous #else condition on CONFIG_PM_SLEEP 2014-09-09 13:59:05 +02:00
dw_mmc-pltfm.c mmc: dw_mmc: remove the prepare_command hook 2016-02-29 11:03:09 +01:00
dw_mmc-pltfm.h
dw_mmc-rockchip.c mmc: dw_mmc: rockchip: unset the MMC_CAP_ERASE flag 2016-07-25 10:34:50 +02:00
dw_mmc.c mmc: dw_mmc: fix the spamming log message 2016-09-22 09:34:13 +02:00
dw_mmc.h mmc: dw_mmc: fix the spamming log message 2016-09-22 09:34:13 +02:00
jz4740_mmc.c timers: Remove set_timer_slack() leftovers 2016-07-07 10:35:09 +02:00
Kconfig mmc: sdhci-of-arasan: Add ability to export card clock 2016-07-25 10:34:19 +02:00
Makefile mmc: sdhci-brcmstb: Add driver for Broadcom BRCMSTB SoCs 2016-07-25 10:34:14 +02:00
mmc_spi.c mmc: mmc_spi: Add Card Detect comments and fix CD GPIO case 2016-03-16 12:36:09 +01:00
mmci_qcom_dml.c mmc: mmci: Add qcom dml support to the driver. 2014-09-09 13:58:46 +02:00
mmci_qcom_dml.h mmc: mmci: Add qcom dml support to the driver. 2014-09-09 13:58:46 +02:00
mmci.c mmc: mmci: Remove redundant runtime PM calls 2016-05-02 10:33:21 +02:00
mmci.h mmc: mmci: Add Qcom specific rx_fifocnt logic. 2014-07-09 11:25:57 +02:00
moxart-mmc.c mmc: moxart: fix wait_for_completion_interruptible_timeout return variable type 2016-09-26 21:31:07 +02:00
mtk-sd.c mmc: mediatek: perfer to use rise edge latching 2016-07-25 10:34:32 +02:00
mvsdio.c mmc: mvsdio: delete platform data code path 2015-12-22 11:32:12 +01:00
mvsdio.h
mxcmmc.c mmc: host: use the defined function to check whether card is removable 2016-07-25 10:34:21 +02:00
mxs-mmc.c mmc: mxs: Constify platform_device_id 2015-06-01 09:06:50 +02:00
of_mmc_spi.c mmc: of_mmc_spi: fix unused warning 2016-03-17 14:54:40 +01:00
omap_hsmmc.c mmc: omap_hsmmc: Initialize dma_slave_config to avoid random data 2016-09-14 13:59:33 +02:00
omap.c mmc: omap: Initialize dma_slave_config to avoid random data in it's fields 2016-09-14 13:59:33 +02:00
pxamci.c mmc: pxamci: fix potential oops 2016-07-18 11:50:40 +02:00
pxamci.h
rtsx_pci_sdmmc.c mmc: rtsx_pci: Remove deprecated create_singlethread_workqueue 2016-07-29 11:29:05 +02:00
rtsx_usb_sdmmc.c mmc: rtsx: Constify platform_device_id 2015-06-01 09:06:50 +02:00
s3cmci.c mmc: s3cmci: Register cpufreq notifier only on S3C24xx 2016-07-25 10:34:46 +02:00
s3cmci.h mmc: s3cmci: Register cpufreq notifier only on S3C24xx 2016-07-25 10:34:46 +02:00
sdhci_f_sdh30.c mmc: sdhci-pltfm: Drop define for SDHCI_PLTFM_PMOPS 2016-07-29 11:29:04 +02:00
sdhci-acpi.c MMC core: 2016-07-31 21:36:58 -04:00
sdhci-bcm-kona.c mmc: sdhci-bcm-kona: fix error return code in sdhci_bcm_kona_probe() 2016-09-26 21:31:08 +02:00
sdhci-brcmstb.c mmc: sdhci-brcmstb: Delete owner assignment 2016-09-26 21:31:10 +02:00
sdhci-cns3xxx.c mmc: sdhci-pltfm: Drop define for SDHCI_PLTFM_PMOPS 2016-07-29 11:29:04 +02:00
sdhci-dove.c mmc: sdhci-pltfm: Drop define for SDHCI_PLTFM_PMOPS 2016-07-29 11:29:04 +02:00
sdhci-esdhc-imx.c mmc: sdhci-esdhc-imx: correct the max timeout count 2016-09-26 21:31:11 +02:00
sdhci-esdhc.h mmc: sdhci-of-esdhc: support both BE and LE host controller 2015-10-26 16:00:08 +01:00
sdhci-iproc.c mmc: sdhci-pltfm: Drop define for SDHCI_PLTFM_PMOPS 2016-07-29 11:29:04 +02:00
sdhci-msm.c mmc: sdhci-msm: Add support for UHS cards 2016-07-25 10:35:02 +02:00
sdhci-of-arasan.c mmc: sdhci-of-arasan: Don't power PHY w/ slow/no clock 2016-09-26 21:31:12 +02:00
sdhci-of-at91.c mmc: host: use the defined function to check whether card is removable 2016-07-25 10:34:21 +02:00
sdhci-of-esdhc.c mmc: sdhci-of-esdhc: use of_property_read_bool 2016-09-26 21:31:08 +02:00
sdhci-of-hlwd.c mmc: sdhci-pltfm: Drop define for SDHCI_PLTFM_PMOPS 2016-07-29 11:29:04 +02:00
sdhci-pci-core.c mmc: sdhci-pci-core: Simplify code by using SET_SYSTEM_SLEEP_PM_OPS 2016-07-27 10:31:41 +02:00
sdhci-pci-data.c mmc: sdhci-pci: Add support for drive strength selection for SPT 2015-06-01 09:07:14 +02:00
sdhci-pci-o2micro.c mmc: sdhci-pci: Make sdhci_pci_o2_fujin2_pci_init() static 2015-10-26 16:00:05 +01:00
sdhci-pci-o2micro.h mmc: sdhci-pci: Make sdhci_pci_o2_fujin2_pci_init() static 2015-10-26 16:00:05 +01:00
sdhci-pci.h sdhci-pci: Use MRFLD as abbreviation of Merrifield 2016-07-25 10:34:59 +02:00
sdhci-pic32.c mmc: sdhci-pic32: remove owner assignment 2016-05-02 10:33:25 +02:00
sdhci-pltfm.c mmc: sdhci-pltfm: Convert to use the SET_SYSTEM_SLEEP_PM_OPS 2016-07-29 11:29:03 +02:00
sdhci-pltfm.h mmc: sdhci-pltfm: Drop define for SDHCI_PLTFM_PMOPS 2016-07-29 11:29:04 +02:00
sdhci-pxav2.c mmc: sdhci-pltfm: Drop define for SDHCI_PLTFM_PMOPS 2016-07-29 11:29:04 +02:00
sdhci-pxav3.c mmc: sdhci-pxav3: Remove non needed #ifdef CONFIG_PM for dev_pm_ops 2016-07-27 11:16:57 +02:00
sdhci-s3c-regs.h
sdhci-s3c.c mmc: sdhci-s3c: Remove non needed #ifdef CONFIG_PM for dev_pm_ops 2016-07-27 11:23:37 +02:00
sdhci-sirf.c mmc: sdhci-sirf: Remove non needed #ifdef CONFIG_PM* for dev_pm_ops 2016-07-27 11:25:23 +02:00
sdhci-spear.c Update Viresh Kumar's email address 2015-07-17 16:39:53 -07:00
sdhci-st.c mmc: sdhci-st: Handle interconnect clock 2016-09-12 10:31:43 +02:00
sdhci-tegra.c mmc: sdhci-pltfm: Drop define for SDHCI_PLTFM_PMOPS 2016-07-29 11:29:04 +02:00
sdhci.c mmc: sdhci: Do not allow tuning procedure to be interrupted 2016-09-26 21:31:11 +02:00
sdhci.h mmc: sdhci: add standard hw auto retuning support 2016-07-25 10:34:55 +02:00
sdricoh_cs.c mmc: sdricoh_cs: Less checks in sdricoh_init_mmc() after, error detection 2016-02-29 11:02:45 +01:00
sh_mmcif.c mmc: sh_mmcif: Use a 10s timeout in the error recovery path 2016-07-25 10:34:25 +02:00
sh_mobile_sdhi.c mmc: sh_mobile_sdhi: properly document R-Car versions 2016-07-25 10:34:02 +02:00
sunxi-mmc.c mmc: sunxi: sun4i / sun5i do not have sample clocks 2016-09-26 21:31:05 +02:00
tifm_sd.c mmc: Convert pr_warning to pr_warn 2014-09-24 10:13:09 +02:00
tmio_mmc_dma.c mmc: tmio: merge distributed include files 2016-05-02 10:33:40 +02:00
tmio_mmc_pio.c mmc: host: use the defined function to check whether card is removable 2016-07-25 10:34:21 +02:00
tmio_mmc.c mmc: TMIO: Use devm_request_irq() 2015-06-01 09:06:48 +02:00
tmio_mmc.h mmc: tmio: make a cast explicit 2016-07-25 10:34:07 +02:00
toshsd.c PM / Runtime: Move ignore_children flag under CONFIG_PM 2016-04-22 01:32:37 +02:00
toshsd.h mmc: add Toshiba PCI SD controller driver 2014-11-26 14:30:58 +01:00
usdhi6rol0.c mmc: usdhi6rol0: add pinctrl to set pin drive strength 2016-05-02 10:36:06 +02:00
ushc.c
via-sdmmc.c
vub300.c mmc: vub300: don't print error when allocating urb fails 2016-09-26 21:31:09 +02:00
wbsd.c mmc: wbsd: Remove unneded semicolon 2015-10-26 15:59:53 +01:00
wbsd.h
wmt-sdmmc.c mmc: constify of_device_id array 2015-03-23 14:13:49 +01:00