[meta-ti,scarthgap] trusted-firmware-a: add power state validation patch for K3 SoCs

This commit adds the TI power state validation patch for K3 SoCs to
ensure correct PSCI power state transitions when using the upstream
Trusted Firmware-A (TFA).
This patch is excluded from the am62lxx platform, which uses the
TI-maintained fork.

Signed-off-by: Telukula Jeevan Kumar Sahu <j-sahu@ti.com>
---
 .../trusted-firmware-a-ti.inc                 |  7 +-
 ...e-power-state-validation-for-K3-SoCs.patch | 64 +++++++++++++++++++
 2 files changed, 70 insertions(+), 1 deletion(-)
 create mode 100644 meta-ti-bsp/recipes-bsp/trusted-firmware-a/trusted-firmware-a/0001-feat-ti-enable-power-state-validation-for-K3-SoCs.patch

We do not want to take feature patches into meta-ti.  It needs to live 
in a repository on a branch.  The only patches we take are Yocto build 
related fixes.


On 7/1/2025 8:36 AM, Telukula Jeevan Kumar Sahu wrote:
> This commit adds the TI power state validation patch for K3 SoCs to
> ensure correct PSCI power state transitions when using the upstream
> Trusted Firmware-A (TFA).
> This patch is excluded from the am62lxx platform, which uses the
> TI-maintained fork.
> 
> Signed-off-by: Telukula Jeevan Kumar Sahu <j-sahu@ti.com>
> ---
>   .../trusted-firmware-a-ti.inc                 |  7 +-
>   ...e-power-state-validation-for-K3-SoCs.patch | 64 +++++++++++++++++++
>   2 files changed, 70 insertions(+), 1 deletion(-)
>   create mode 100644 meta-ti-bsp/recipes-bsp/trusted-firmware-a/trusted-firmware-a/0001-feat-ti-enable-power-state-validation-for-K3-SoCs.patch
> 
> diff --git a/meta-ti-bsp/recipes-bsp/trusted-firmware-a/trusted-firmware-a-ti.inc b/meta-ti-bsp/recipes-bsp/trusted-firmware-a/trusted-firmware-a-ti.inc
> index ec52d09c..588ee9d4 100644
> --- a/meta-ti-bsp/recipes-bsp/trusted-firmware-a/trusted-firmware-a-ti.inc
> +++ b/meta-ti-bsp/recipes-bsp/trusted-firmware-a/trusted-firmware-a-ti.inc
> @@ -5,14 +5,19 @@ PV = "2.13+git"
>   LIC_FILES_CHKSUM = "file://docs/license.rst;md5=6ed7bace7b0bc63021c6eba7b524039e"
>   SRCREV_tfa = "d90bb650fe4cb3784f62214ab5829f4051c38d0a"
>   SRC_URI_TRUSTED_FIRMWARE_A = "git://git.trustedfirmware.org/TF-A/trusted-firmware-a.git;protocol=https"
> +TFA_TI_PATCH = "file://0001-feat-ti-enable-power-state-validation-for-K3-SoCs.patch"
>   SRCBRANCH = "master"
>   
>   LIC_FILES_CHKSUM:am62lxx = "file://docs/license.rst;md5=1118e32884721c0be33267bd7ae11130"
>   SRCREV_tfa:am62lxx = "2ab59f45ad0a5d95b5cb339c0f64686954377050"
>   SRC_URI_TRUSTED_FIRMWARE_A:am62lxx = "git://github.com/TexasInstruments/arm-trusted-firmware.git;protocol=https"
> +TFA_TI_PATCH:am62lxx = ""
>   SRCBRANCH:am62lxx = "ti-master"
>   
> -SRC_URI = "${SRC_URI_TRUSTED_FIRMWARE_A};name=tfa;branch=${SRCBRANCH}"
> +SRC_URI = " \
> +    ${SRC_URI_TRUSTED_FIRMWARE_A};name=tfa;branch=${SRCBRANCH} \
> +    ${TFA_TI_PATCH} \
> +"
>   
>   COMPATIBLE_MACHINE = "k3"
>   
> diff --git a/meta-ti-bsp/recipes-bsp/trusted-firmware-a/trusted-firmware-a/0001-feat-ti-enable-power-state-validation-for-K3-SoCs.patch b/meta-ti-bsp/recipes-bsp/trusted-firmware-a/trusted-firmware-a/0001-feat-ti-enable-power-state-validation-for-K3-SoCs.patch
> new file mode 100644
> index 00000000..0ed2a933
> --- /dev/null
> +++ b/meta-ti-bsp/recipes-bsp/trusted-firmware-a/trusted-firmware-a/0001-feat-ti-enable-power-state-validation-for-K3-SoCs.patch
> @@ -0,0 +1,64 @@
> +From 8f676fc677752ca432b424b9738aac12357a35e7 Mon Sep 17 00:00:00 2001
> +From: Kendall Willis <k-willis@ti.com>
> +Date: Tue, 17 Jun 2025 10:43:30 -0500
> +Subject: [PATCH] feat(ti): enable power state validation for K3 SoCs
> +
> +Add power state validation for K3 SoCs to ensure proper PSCI power state
> +transitions. Defining validate_power_state enables the
> +PSCI_CPU_SUSPEND_AARCH64 capability and, in turn, CPU_SUSPEND.
> +
> +validate_power_state checks if the requested power level and power state
> +are in a valid configuration. If the power state requested is standby,
> +set the core power state to the maximum retention state.
> +
> +Upstream-Status: Submitted [https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/39502]
> +Change-Id: Ied3ebdc583b2e5b7c86923705954d763997b324e
> +Signed-off-by: Kendall Willis <k-willis@ti.com>
> +---
> + plat/ti/k3/common/k3_psci.c | 23 +++++++++++++++++++++++
> + 1 file changed, 23 insertions(+)
> +
> +diff --git a/plat/ti/k3/common/k3_psci.c b/plat/ti/k3/common/k3_psci.c
> +index c679344c8..ec37d9f4c 100644
> +--- a/plat/ti/k3/common/k3_psci.c
> ++++ b/plat/ti/k3/common/k3_psci.c
> +@@ -226,6 +226,28 @@ static void __dead2 k3_system_reset(void)
> +         wfi();
> + }
> +
> ++static int k3_validate_power_state(unsigned int power_state, psci_power_state_t *req_state)
> ++{
> ++    unsigned int pwr_lvl = psci_get_pstate_pwrlvl(power_state);
> ++    unsigned int pstate = psci_get_pstate_type(power_state);
> ++
> ++    if (pwr_lvl > PLAT_MAX_PWR_LVL)
> ++        return PSCI_E_INVALID_PARAMS;
> ++
> ++    if (pstate == PSTATE_TYPE_STANDBY) {
> ++        /*
> ++         * It's possible to enter standby only on power level 0
> ++         * Ignore any other power level.
> ++         */
> ++        if (pwr_lvl != MPIDR_AFFLVL0)
> ++            return PSCI_E_INVALID_PARAMS;
> ++
> ++        CORE_PWR_STATE(req_state) = PLAT_MAX_RET_STATE;
> ++    }
> ++
> ++    return PSCI_E_SUCCESS;
> ++}
> ++
> + static void k3_pwr_domain_suspend_to_mode(const psci_power_state_t *target_state, uint8_t mode)
> + {
> +     unsigned int core, proc_id;
> +@@ -286,6 +308,7 @@ static plat_psci_ops_t k3_plat_psci_ops = {
> +     .get_sys_suspend_power_state = k3_get_sys_suspend_power_state,
> +     .system_off = k3_system_off,
> +     .system_reset = k3_system_reset,
> ++    .validate_power_state = k3_validate_power_state,
> + };
> +
> + int plat_setup_psci_ops(uintptr_t sec_entrypoint,
> +--
> +2.34.1
> +