Merge tag 'fixes-nc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC non-critical bug fixes from Arnd Bergmann:
 "These are bug fixes for harmless problems that were not important
  enough to get fixed in 3.17.  The majority of these are OMAP specific,
  but there are also a couple for Marvell mvebu, cns3xxx, and others, as
  well as some updates for the MAINTAINERS file.

  In particular, Robert Jarzmik and Daniel Mack now volunteered to help
  out maintaining the PXA platform, Krzysztof Halasa took over the
  cns3xxx platform, Carlo Caione is the maintainer for the new Amlogic
  meson platform, and Matthias Brugger is now listed for the mediatek
  platform he recently contributed"

* tag 'fixes-nc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (42 commits)
  MAINTAINERS: update Shawn's email address
  MAINTAINERS: condense some Tegra related entries
  MAINTAINERS: add Alexandre Courbot for Tegra
  MAINTAINERS: CNS3xxx and IXP4xx update.
  MAINTAINERS: Add maintainers entry for Mediatek SoCs
  arm, vt8500, LLVMLlinux: Use mcr instead of mcr% for mach-vt8500
  MAINTAINERS: add a third maintainer to mach-bcm
  CNS3xxx: Fix PCIe read size limit.
  CNS3xxx: Fix logical PCIe topology.
  CNS3xxx: Fix debug UART.
  MAINTAINERS: Add entry for the Amlogic MesonX SoCs
  MAINTAINERS: update ARM pxa maintainers
  ARM: at91/PMC: don't forget to write PMC_PCDR register to disable clocks
  ARM: at91: fix at91sam9263ek DT mmc pinmuxing settings
  ARM: mvebu: Netgear RN102: Use Hardware BCH ECC
  ARM: Kirkwood: Fix DT based DSA.
  ARM: OMAP2+: make of_device_ids const
  ARM: omap2: make arrays containing machine compatible strings const
  ARM: LPC32xx: Fix reset function
  ARM: mvebu: Netgear RN2120: Use Hardware BCH ECC
  ...

1 files changed, 78 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index faebd5f076af..7fb033eca0a5 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -546,7 +546,8 @@ int pwrdm_for_each_clkdm(struct powerdomain *pwrdm,
 		return -EINVAL;
 
 	for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++)
-		ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);
+		if (pwrdm->pwrdm_clkdms[i])
+			ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);
 
 	return ret;
 }
@@ -1080,6 +1081,82 @@ int pwrdm_post_transition(struct powerdomain *pwrdm)
 }
 
 /**
+ * pwrdm_get_valid_lp_state() - Find best match deep power state
+ * @pwrdm:	power domain for which we want to find best match
+ * @is_logic_state: Are we looking for logic state match here? Should
+ *		    be one of PWRDM_xxx macro values
+ * @req_state:	requested power state
+ *
+ * Returns: closest match for requested power state. default fallback
+ * is RET for logic state and ON for power state.
+ *
+ * This does a search from the power domain data looking for the
+ * closest valid power domain state that the hardware can achieve.
+ * PRCM definitions for PWRSTCTRL allows us to program whatever
+ * configuration we'd like, and PRCM will actually attempt such
+ * a transition, however if the powerdomain does not actually support it,
+ * we endup with a hung system. The valid power domain states are already
+ * available in our powerdomain data files. So this function tries to do
+ * the following:
+ * a) find if we have an exact match to the request - no issues.
+ * b) else find if a deeper power state is possible.
+ * c) failing which, it tries to find closest higher power state for the
+ * request.
+ */
+u8 pwrdm_get_valid_lp_state(struct powerdomain *pwrdm,
+			    bool is_logic_state, u8 req_state)
+{
+	u8 pwrdm_states = is_logic_state ? pwrdm->pwrsts_logic_ret :
+			pwrdm->pwrsts;
+	/* For logic, ret is highest and others, ON is highest */
+	u8 default_pwrst = is_logic_state ? PWRDM_POWER_RET : PWRDM_POWER_ON;
+	u8 new_pwrst;
+	bool found;
+
+	/* If it is already supported, nothing to search */
+	if (pwrdm_states & BIT(req_state))
+		return req_state;
+
+	if (!req_state)
+		goto up_search;
+
+	/*
+	 * So, we dont have a exact match
+	 * Can we get a deeper power state match?
+	 */
+	new_pwrst = req_state - 1;
+	found = true;
+	while (!(pwrdm_states & BIT(new_pwrst))) {
+		/* No match even at OFF? Not available */
+		if (new_pwrst == PWRDM_POWER_OFF) {
+			found = false;
+			break;
+		}
+		new_pwrst--;
+	}
+
+	if (found)
+		goto done;
+
+up_search:
+	/* OK, no deeper ones, can we get a higher match? */
+	new_pwrst = req_state + 1;
+	while (!(pwrdm_states & BIT(new_pwrst))) {
+		if (new_pwrst > PWRDM_POWER_ON) {
+			WARN(1, "powerdomain: %s: Fix max powerstate to ON\n",
+			     pwrdm->name);
+			return PWRDM_POWER_ON;
+		}
+
+		if (new_pwrst == default_pwrst)
+			break;
+		new_pwrst++;
+	}
+done:
+	return new_pwrst;
+}
+
+/**
  * omap_set_pwrdm_state - change a powerdomain's current power state
  * @pwrdm: struct powerdomain * to change the power state of
  * @pwrst: power state to change to