Merge tag 'tegra-for-3.15-tf' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into next/soc

Merge "ARM: tegra: Trusted Foundations work for 3.15" from Stephen Warren:

This pull request contains a number of cleanups and enhancements for the
Trusted Foundations firmware used on production Tegra SoCs. The changes
allow kernels without TF support to run on HW that uses TF, albeit with
reduced functionality, and also fix the cpuidle feature.

* tag 'tegra-for-3.15-tf' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
  ARM: tegra: cpuidle: use firmware for power down
  ARM: trusted_foundations: implement prepare_idle()
  ARM: firmware: add prepare_idle() operation
  ARM: firmware: enable Trusted Foundations by default
  ARM: trusted_foundations: fallback when TF support is missing
  ARM: trusted_foundations: fix vendor prefix typos

Signed-off-by: Olof Johansson <olof@lixom.net>

2 files changed, 13 insertions, 4 deletions

diff --git a/arch/arm/include/asm/firmware.h b/arch/arm/include/asm/firmware.h
index 15631300c238..2c9f10df7568 100644
--- a/arch/arm/include/asm/firmware.h
+++ b/arch/arm/include/asm/firmware.h
@@ -22,6 +22,10 @@
  */
 struct firmware_ops {
         /*
+         * Inform the firmware we intend to enter CPU idle mode
+         */
+        int (*prepare_idle)(void);
+        /*
          * Enters CPU idle mode
          */
         int (*do_idle)(void);
diff --git a/arch/arm/include/asm/trusted_foundations.h b/arch/arm/include/asm/trusted_foundations.h
index 3bd36e2c5f2e..b5f7705abcb0 100644
--- a/arch/arm/include/asm/trusted_foundations.h
+++ b/arch/arm/include/asm/trusted_foundations.h
@@ -30,6 +30,8 @@
 #include <linux/printk.h>
 #include <linux/bug.h>
 #include <linux/of.h>
+#include <linux/cpu.h>
+#include <linux/smp.h>
 
 struct trusted_foundations_platform_data {
         unsigned int version_major;
@@ -47,10 +49,13 @@ static inline void register_trusted_foundations(
                                    struct trusted_foundations_platform_data *pd)
 {
         /*
-         * If we try to register TF, this means the system needs it to continue.
-         * Its absence if thus a fatal error.
+         * If the system requires TF and we cannot provide it, continue booting
+         * but disable features that cannot be provided.
          */
-        panic("No support for Trusted Foundations, stopping...\n");
+        pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
+        pr_err("Secondary processors as well as CPU PM will be disabled.\n");
+        setup_max_cpus = 0;
+        cpu_idle_poll_ctrl(true);
 }
 
 static inline void of_register_trusted_foundations(void)
@@ -59,7 +64,7 @@ static inline void of_register_trusted_foundations(void)
          * If we find the target should enable TF but does not support it,
          * fail as the system won't be able to do much anyway
          */
-        if (of_find_compatible_node(NULL, NULL, "tl,trusted-foundations"))
+        if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
                 register_trusted_foundations(NULL);
 }
 #endif /* CONFIG_TRUSTED_FOUNDATIONS */