The R5F subsystem/cluster on K3 SoCs can support both LockStep and Split-modes (superset) or just Split-mode depending on an eFUSE capability register. The LockStep configuration bit is Read-only though on Split-mode _only_ devices and as such the System Firmware does not allow the LockStep mode bit to be configured on such devices. The current logic in k3_r5f_rproc_configure() fails on Split-mode devices because of this unconditional programming of the LockStep mode bit, and results in the probe failure shown during the "rproc init" step at U-Boot prompt.

Fix this by limiting the LockStep mode bit clear configuration only on devices supporting both LockStep/Split-modes.

Fixes: 4c850356a83f ("remoteproc: Introduce K3 remoteproc driver for R5F subsystem") Signed-off-by: Suman Anna s-anna@ti.com Signed-off-by: Andreas Dannenberg dannenberg@ti.com Signed-off-by: Lokesh Vutla lokeshvutla@ti.com --- Hi Lokesh,

Verified the behavior on top of the ti/next branch on a custom board with the Split-mode only SoC.

regards Suman

drivers/remoteproc/ti_k3_r5f_rproc.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/remoteproc/ti_k3_r5f_rproc.c b/drivers/remoteproc/ti_k3_r5f_rproc.c index 2e2665f3750d..c01b29d90f1b 100644 --- a/drivers/remoteproc/ti_k3_r5f_rproc.c +++ b/drivers/remoteproc/ti_k3_r5f_rproc.c @@ -543,6 +543,7 @@ static int k3_r5f_rproc_configure(struct k3_r5f_core *core) { struct k3_r5f_cluster *cluster = core->cluster; u32 set_cfg = 0, clr_cfg = 0, cfg, ctrl, sts; + bool lockstep_permitted; u64 boot_vec = 0; int ret;

@@ -560,8 +561,9 @@ static int k3_r5f_rproc_configure(struct k3_r5f_core *core) goto out;

/* Sanity check for Lockstep mode */ - if (cluster->mode && is_primary_core(core) && - !(sts & PROC_BOOT_STATUS_FLAG_R5_LOCKSTEP_PERMITTED)) { + lockstep_permitted = !!(sts & + PROC_BOOT_STATUS_FLAG_R5_LOCKSTEP_PERMITTED); + if (cluster->mode && is_primary_core(core) && !lockstep_permitted) { dev_err(core->dev, "LockStep mode not permitted on this device\n"); ret = -EINVAL; goto out; @@ -573,7 +575,7 @@ static int k3_r5f_rproc_configure(struct k3_r5f_core *core) clr_cfg |= PROC_BOOT_CFG_FLAG_R5_TEINIT; if (cluster->mode == CLUSTER_MODE_LOCKSTEP) set_cfg |= PROC_BOOT_CFG_FLAG_R5_LOCKSTEP; - else + else if (lockstep_permitted) clr_cfg |= PROC_BOOT_CFG_FLAG_R5_LOCKSTEP; }