In commit 802ac39a55 ("mmc: sdhci-of-arasan: fix set_clock when a phy
is supported") we added code to power the PHY off and on whenever the
clock was changed but we avoided doing the power cycle code when the
clock was low speed. Let's now do it always.
Although there may be other reasons for power cycling the PHY when the
clock changes, one of the main reasons is that we need to give the DLL a
chance to re-lock with the new clock.
One of the things that the DLL is for is tuning the Receive Clock in
HS200 mode and STRB in HS400 mode. Thus it is clear that we should make
sure we power cycle the PHY (and wait for the DLL to lock) when we know
we'll be in one of these two speed modes. That's what the original code
did, though it used the clock rate rather than the speed mode. However,
even in speed modes other than HS200,/HS400 the DLL is used for
something since it can be clearly observed that the PHY doesn't function
properly if you leave the DLL off.
Although it appears less important to power cycle the PHY and wait for
the DLL to lock when not in HS200/HS400 modes (no bugs were reported),
it still seems wise to let the locking always happen nevertheless.
Note: as part of this, we make sure that we never try to turn the PHY on
when the clock is off (when the clock rate is 0). The PHY cannot work
when the clock is off since its DLL can't lock.
This change requires ("phy: rockchip-emmc: Increase lock time
allowance") and will cause problems if picked without that change.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Currently sdhci-arasan 5.1 can support enhanced strobe function,
and we now limit it just for "arasan,sdhci-5.1". Add
mmc-hs400-enhanced-strobe in DT to enable the function if we're
sure our controller can support it.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Tested-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
commit 61b914eb81f8 ("mmc: sdhci-of-arasan: add phy support for
sdhci-of-arasan") introduce phy support for arasan. According to
the vendor's databook, we should make sure the phy is in poweroff
status before we configure the clk stuff. Otherwise it may cause
some IO sample timing issues from the test. And we don't need this
extra operation while running in low performance mode since phy
doesn't trigger sampling block.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This patch adds Generic PHY access for sdhci-of-arasan. Driver
can get PHY handler from dt-binding, and power-on/init the PHY.
Currently, it's just mandatory for arasan,sdhci-5.1.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Currently, some err handling of sdhci_arasan_probe return directly
without calling sdhci_pltfm_free. This patch fixes them.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
We don't really need disable clk_ahb when failing to resume. Otherwise
we may take risk of bus error for accessing register without clk_ahb.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Commit 0e74823429 ("mmc: sdhci: Add size for caller in init+register")
allows users of sdhci_pltfm to allocate private space in calls to
sdhci_pltfm_init+sdhci_pltfm_register. This patch migrates the
sdhci-of-arasan driver to this allocation.
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
sdhci_pltfm_unregister() could operate host's registers, it will cause
problems if the clk is already disabled and unprepared. Fix this issue
by moving the clk_disable_unprepare() call to the end of remove
function.
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Acked-by: Sören Brinkmann <soren.brinkmann@xilinx.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
The Arason SD host controller supports set block count command (cmd23)
and high speed mode. This patch re-enable both of these features that
was disabled. For device that doesn't support high speed, it should
configure its capability register accordingly instead disables it
explicitly.
Signed-off-by: Rameshwar Prasad Sahu <rsahu@apm.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This patch adds the compatible string in sdhci-of-arasan.c to
support sdhci-arasan5.1 version of controller. No documented
controller IP version is found in the TRM, so we use ths version
of command queueing engine integrated into this controller by arasan
to specify our controller.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This patch adds the quirks and compatible string in sdhci-of-arasan.c
to support sdhci-arasan4.9a version of controller.
Signed-off-by: Suman Tripathi <stripathi@apm.com>
Reviewed-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Also check MMC OF properties. The controller supports MMC too.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
So we can avoid to sprinkle the clk_disable_unprepare() in many
drivers.
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
sdhci_add_host and sdhci_platfm_init already report failure,
so don't emit error messages when a failure occurs. This prevents
occurences of "deferred" messages when required power supplies
are not ready for operation yet.
Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
"ret" is a signed int, so use "%d" in format strings instead of "%u".
This prevents cryptic codes in error messages like this:
sdhci-arasan e0101000.sdhci: platform register failed (4294966779)
Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Reviewed-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This patch removes the superflous .owner field for drivers which
use the module_platform_driver API, as this is overriden in
platform_driver_register anyway.
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Add sdhci_set_uhs_signaling() and always call the set_uhs_signaling
method. This avoids quirks being added into sdhci_set_uhs_signaling().
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Markus Pargmann <mpa@pengutronix.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
[Ulf Hansson] Resolved conflict
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Markus Pargmann <mpa@pengutronix.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Rather than having platform_reset_enter/platform_reset_exit methods,
turn the core of the reset handling into a library function which
platforms can call at the appropriate moment in their (new) reset
method.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Markus Pargmann <mpa@pengutronix.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Markus Pargmann <mpa@pengutronix.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Add a driver for Arasan's SDHCI controller core.
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Acked-by: Rob Herring <rob.herring@calxeda.com> [binding]
Acked-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: Chris Ball <chris@printf.net>
Douglas Anderson