linux.git/drivers/soc/imx, branch v4.12

soc: imx: add PM dependency for IMX7_PM_DOMAINS

2017-05-15T01:33:22+00:00

The new pm domain driver causes a build failure when CONFIG_PM
is not set:

warning: (IMX7_PM_DOMAINS) selects PM_GENERIC_DOMAINS which has unmet direct dependencies (PM)
drivers/base/power/domain_governor.c: In function 'default_suspend_ok':
drivers/base/power/domain_governor.c:75:17: error: 'struct dev_pm_info' has no member named 'ignore_children'

This adds a dependency to ensure that we don't attempt to build the
driver without CONFIG_PM.

Fixes: 03aa12629fc4 ("soc: imx: Add GPCv2 power gating driver")
Signed-off-by: Arnd Bergmann 
Reviewed-by: Fabio Estevam 
Signed-off-by: Shawn Guo

soc: imx: gpc: add workaround for i.MX6QP to the GPC PD driver

2017-04-07T12:47:34+00:00

On i.MX6QP, due to hardware erratum ERR009619, the PRE clocks may be
stalled during the power up sequencing of the PU power domain. As this
may lead to a complete loss of display output, the recommended
workaround is to keep the PU domain enabled during normal system
operation.

Implement this by rejecting the domain power down request on the
affected SoC.

Signed-off-by: Lucas Stach 
Signed-off-by: Shawn Guo

soc: imx: gpc: add defines for domain index

2017-04-07T12:47:24+00:00

Makes referencing a specfic domain in the driver code
less error prone.

Signed-off-by: Lucas Stach 
Signed-off-by: Shawn Guo

soc: imx: Add GPCv2 power gating driver

2017-04-07T11:37:07+00:00

Add code allowing for control of various power domains managed by GPCv2
IP block found in i.MX7 series of SoCs. Power domains covered by this
patch are:

    - PCIE PHY
    - MIPI PHY
    - USB HSIC PHY
    - USB OTG1/2 PHY

Support for any other power domain controlled by GPC is not present, and
can be added at some later point.

Testing of this code was done against a PCIe driver.

Cc: yurovsky@gmail.com
Cc: Lucas Stach 
Cc: Fabio Estevam 
Cc: Dong Aisheng 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Andrey Smirnov 
Signed-off-by: Shawn Guo

soc: imx: gpc: remove unnecessary readable_reg callback

2017-03-24T05:43:21+00:00

It is not really necessary to provide the current .readable_reg
implementation as we know what we're doing in our driver
and the regmap core has already done the partial check for
available maximum regs.

Acked-by: Lucas Stach 
Signed-off-by: Dong Aisheng 
Signed-off-by: Shawn Guo

soc: imx: gpc: keep PGC_X_CTRL name align with reference manual

2017-03-24T05:43:10+00:00

Instead of GPC_PGC_PDN_OFFS, naming it as GPC_PGC_CTRL_OFFS which is
defined in reference manual for better reading.

Reviewed-by: Lucas Stach 
Signed-off-by: Dong Aisheng 
Signed-off-by: Shawn Guo

soc: imx: gpc: fix comment when power up domain

2017-03-24T05:43:04+00:00

The correct comment should be power up domain.

Reviewed-by: Lucas Stach 
Signed-off-by: Dong Aisheng 
Signed-off-by: Shawn Guo

soc: imx: gpc: fix imx6sl gpc power domain regression

2017-03-24T05:42:07+00:00

Commit 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver")
broke the MX6SL GPC power domain support.
It always got the following error:
[    1.248364] imx-gpc 20dc000.gpc: could not find pgc DT node
This patch adds back the legecy support.

Fixes: 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver")
Signed-off-by: Dong Aisheng 
Reviewed-by: Lucas Stach 
Signed-off-by: Shawn Guo

soc: imx: gpc: fix domain_index sanity check issue

2017-03-24T05:42:01+00:00

ARRAY_SIZE(imx_gpc_domains) represents all power domains supported
by different SoCs. Driver should use SoC specific of_id_data->num_domains
instead to do power domain index sanity check.
e.g. MX6Q supports two power domains while MX6SL supports three.

Fixes: 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver")
Acked-by: Lucas Stach 
Signed-off-by: Dong Aisheng 
Signed-off-by: Shawn Guo

soc: imx: gpc: fix the wrong using of regmap cache

2017-03-24T05:41:51+00:00

Without providing the proper reg_defaults, the regmap registers first
read out may be always 0 if enabling cache, which results in the
following issue we met.
e.g. During driver probe in imx6_pm_domain_power_on():
regmap_read(pd->regmap, pd->reg_offs + GPC_PGC_PUPSCR_OFFS, &val);
The PGC_PUPSCR register val is always 0 but it's actually 0xf01 in HW.

Since GPC registers are tightly related to CPU bring up and may be
changed in bootloader, we don't want to provide defaults.
And the cache really does not save too much for GPC module.

Therefore, simply disable cache to fix the issue and make life easy.

Reviewed-by: Lucas Stach 
Fixes: 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver")
Signed-off-by: Dong Aisheng 
Signed-off-by: Shawn Guo