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remoteproc: k3-r5: Fix rproc init failure on Split-mode _only_ devices

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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: 4c850356a8 ("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>
This commit is contained in:
Suman Anna 2020-03-10 20:24:29 -05:00 committed by Lokesh Vutla
parent 0438a0a181
commit 445b45042c
1 changed files with 5 additions and 3 deletions
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8
drivers/remoteproc/ti_k3_r5f_rproc.c
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@ -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;
}