linux.git/drivers/mmc/core, branch v4.8-rc2

mmc: Change the max discard sectors and erase response when HW busy detect

2016-07-25T09:11:08+00:00

When mmc host HW supports busy signalling (using R1B as response), don't
use the host->max_busy_timeout as the limitation when deciding the max
discard sectors, which we inform the generic BLOCK layer about. Instead,
let's use at least one preferred erase size as the max discard sectors.

In cases when the host controller supports HW busy signalling and the
timeout for the erase operation doesn't exceed the max_busy_timeout, we
keep the R1B response, otherwise we prevent the host from doing HW busy
detection by converting to a R1 response.

Signed-off-by: Baolin Wang 
Signed-off-by: Ulf Hansson

mmc: core: Extend sysfs with DSR register

2016-07-25T08:34:51+00:00

Export DSR register through sysfs same as we did for the CID, CSD and
OCR registers.

Signed-off-by: Bojan Prtvar 
Signed-off-by: Ulf Hansson

mmc: core: expose MMC_CAP2_NO_* to dt

2016-07-25T08:34:49+00:00

The reason for why we expose these to dt is that some of
the controller is unable to send special cmd type due to
the hw limitation.

Signed-off-by: Shawn Lin 
Signed-off-by: Ulf Hansson

mmc: core: Extend sysfs with OCR register

2016-07-25T08:34:48+00:00

Registers CID and CSD are already exported through sysfs so let's make
this interface complete by adding missing OCR register.

Signed-off-by: Bojan Prtvar 
Reviewed-by: Wolfram Sang 
Signed-off-by: Ulf Hansson

mmc: core: Allow hosts to specify non-support for MMC commands

2016-07-25T08:34:47+00:00

Host drivers which needs to valdiate for non-supported MMC
commands and returnn error code for such requests.

To improve and simplify the behaviour, let's invent MMC_CAP2_NO_MMC
which these host drivers can set to tell the mmc core to skip sending MMC
commands during card initialization.

Signed-off-by: Shawn Lin 
Signed-off-by: Ulf Hansson

mmc: core: Allow hosts to specify non-support for SD commands

2016-07-25T08:34:22+00:00

There are host drivers which needs to valdiate for non-supported SD
commands and returnn error code for such requests.

To improve and simplify the behaviour, let's invent MMC_CAP2_NO_SD
which these host drivers can set to tell the mmc core to skip sending SD
commands during card initialization.

Signed-off-by: Ulf Hansson

mmc: core: Disable HPI for certain Hynix eMMC cards

2016-07-25T08:34:12+00:00

Certain Hynix eMMC 4.41 cards might get broken when HPI feature is used
and hence this patch disables the HPI feature for such buggy cards.

As some of the other features like BKOPs/Cache/Sanitize are dependent on
HPI feature, those features would also get disabled if HPI is disabled.

Signed-off-by: Pratibhasagar V 
Signed-off-by: Subhash Jadavani 
[gdavis: Forward port and cleanup]
Signed-off-by: George G. Davis 
Signed-off-by: Ulf Hansson

mmc: core: Only change mode if mmc_select_bus_width() is successful

2016-07-25T08:34:12+00:00

mmc_select_bus_width() returns bus width (4 or 8) on success or
zero if unsupported. So only change mode if setting the bus width
is successful.

Signed-off-by: Peter Griffin 
Signed-off-by: Ulf Hansson

mmc: Set pref erase size based on size

2016-07-25T08:34:11+00:00

If available, eMMC stack uses HC_ERASE_GRP_SIZE as the preferred erase
size. As some high capacity eMMC (64MB) reports this size to 512kB, the
discard operations end up taking very long time.

Improve the behaviour by instead calculating the preferred erase size
based on the eMMC size. In this way the discard operations becomes faster.

Signed-off-by: Gwendal Grignou 
[Ulf: Updated changelog and improved comment in code]
Signed-off-by: Ulf Hansson

mmc: mmc: Fix HS switch failure in mmc_select_hs400()

2016-07-25T08:34:09+00:00

To slove the issue which was found on gru board for hs400.

[    4.616946] sdhci: Secure Digital Host Controller Interface driver
[    4.623135] sdhci: Copyright(c) Pierre Ossman
[    4.722575] sdhci-pltfm: SDHCI platform and OF driver helper
[    4.730962] sdhci-arasan fe330000.sdhci: No vmmc regulator found
[    4.737444] sdhci-arasan fe330000.sdhci: No vqmmc regulator found
[    4.774930] mmc0: SDHCI controller on fe330000.sdhci [fe330000.sdhci] using ADMA
[    4.980295] mmc0: switch to high-speed from hs200 failed, err:-84
[    4.986487] mmc0: error -84 whilst initialising MMC card

We should change HS400 mode selection timing to meet JEDEC
specification. The JEDEC 5.1 said that change the frequency to <= 52MHZ
after HS_TIMING switch. Refer to section 6.6.2.3 "HS400" timing mode
selection:
Set the "Timing Interface" parameter in the HS_TIMING[185] field of the
Extended CSD register to 0x1 to switch to High Speed mode and then set
the clock frequency to a value not greater than 52MHZ.

Signed-off-by: Ziyuan Xu 
Signed-off-by: Ulf Hansson