Several new models of readers use different way to select driving
capability (a necessary adjustment along with voltage change). Removing
this from device-independent rtsx_pci_sdmmc module. It will be implemented
in device-depend calls encapsulated by rtsx_pci_switch_output_voltage().
Signed-off-by: NRoger Tseng <rogerable@realtek.com>
Reviewed-by: NWei WANG <wei_wang@realsil.com.cn>
Signed-off-by: NChris Ball <cjb@laptop.org>

Realtek card reader supports both SD and MS card. According to the
settings of rtsx MFD driver, SD host will be probed before MS host.
If we boot/reboot Linux with SD card inserted, the resetting flow of SD
card will succeed, and the following resetting flow of MS is sure to fail.
Then MS upper-level driver will ask rtsx driver to turn power off. This
request leads to the result that the following SD commands fail and SD card
can't be accessed again.

In this commit, Realtek's SD and MS host driver will check whether the card
that upper driver requesting is the one existing in the slot. If not, Realtek's
host driver will refuse the operation to make sure the exlusive accessing
at the same time.
Signed-off-by: NWei WANG <wei_wang@realsil.com.cn>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

Different card reader has different method to switch output voltage, so
we have to use the callback function provided by MFD driver to switch
output pad voltage.
Signed-off-by: NWei WANG <wei_wang@realsil.com.cn>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

This fixes the following build error on some architectures (parisc at least):

drivers/mmc/host/rtsx_pci_sdmmc.c: In function 'sd_normal_rw':
drivers/mmc/host/rtsx_pci_sdmmc.c:448:2: error: implicit
declaration of function 'kzalloc'
[-Werror=implicit-function-declaration]
drivers/mmc/host/rtsx_pci_sdmmc.c:448:6: warning: assignment
makes pointer from integer without a cast [enabled by default]
drivers/mmc/host/rtsx_pci_sdmmc.c:472:2: error: implicit
declaration of function 'kfree'
[-Werror=implicit-function-declaration]
Signed-off-by: NWei WANG <wei_wang@realsil.com.cn>
Acked-by: NChris Ball <cjb@laptop.org>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

For Realtek card reader, internal regsiter SD_CFG2 should be configured
before transferring data.
The default value of SD_CFG2 is proper for writing data. But for reading
sequence, the timing is not good enough. So in some extreme circumstance,
card reader may sample the response data from the card as good even if
the data is wrong. And this will cause the bad consequence.
In the prior version, the value of this register has been calculated,
but forgotten to write back to the internal register.
Signed-off-by: NWei WANG <wei_wang@realsil.com.cn>
Acked-by: NChris Ball <cjb@laptop.org>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

Signed-off-by: NWei WANG <wei_wang@realsil.com.cn>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

Realtek PCI-E SD/MMC card host driver is used to access SD/MMC card,
with the help of Realtek PCI-E card reader MFD driver.
Signed-off-by: NWei WANG <wei_wang@realsil.com.cn>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Tested-by: NBorislav Petkov <bp@alien8.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Realtek PCI-E SD/MMC card host driver is used to access SD/MMC card,
with the help of Realtek PCI-E card reader MFD driver.
Signed-off-by: NWei WANG <wei_wang@realsil.com.cn>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Tested-by: NBorislav Petkov <bp@alien8.de>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>