Acquire the mailbox handle during device probe and do not release handle in stop/detach routine or error paths. This removes the redundant requests for mbox handle later during rproc start/attach. This also allows to defer remoteproc driver's probe if mailbox is not probed yet. Signed-off-by: Beleswar Padhi <b-padhi@xxxxxx> --- drivers/remoteproc/ti_k3_dsp_remoteproc.c | 76 ++++++++--------------- 1 file changed, 26 insertions(+), 50 deletions(-) diff --git a/drivers/remoteproc/ti_k3_dsp_remoteproc.c b/drivers/remoteproc/ti_k3_dsp_remoteproc.c index 3555b535b1683..edaa5e91aebe9 100644 --- a/drivers/remoteproc/ti_k3_dsp_remoteproc.c +++ b/drivers/remoteproc/ti_k3_dsp_remoteproc.c @@ -115,6 +115,10 @@ static void k3_dsp_rproc_mbox_callback(struct mbox_client *client, void *data) const char *name = kproc->rproc->name; u32 msg = omap_mbox_message(data); + /* Do not forward messages to a detached core */ + if (kproc->rproc->state == RPROC_DETACHED) + return; + dev_dbg(dev, "mbox msg: 0x%x\n", msg); switch (msg) { @@ -230,12 +234,9 @@ static int k3_dsp_rproc_request_mbox(struct rproc *rproc) client->knows_txdone = false; kproc->mbox = mbox_request_channel(client, 0); - if (IS_ERR(kproc->mbox)) { - ret = -EBUSY; - dev_err(dev, "mbox_request_channel failed: %ld\n", - PTR_ERR(kproc->mbox)); - return ret; - } + if (IS_ERR(kproc->mbox)) + return dev_err_probe(dev, PTR_ERR(kproc->mbox), + "mbox_request_channel failed\n"); /* * Ping the remote processor, this is only for sanity-sake for now; @@ -315,32 +316,23 @@ static int k3_dsp_rproc_start(struct rproc *rproc) u32 boot_addr; int ret; - ret = k3_dsp_rproc_request_mbox(rproc); - if (ret) - return ret; - boot_addr = rproc->bootaddr; if (boot_addr & (kproc->data->boot_align_addr - 1)) { dev_err(dev, "invalid boot address 0x%x, must be aligned on a 0x%x boundary\n", boot_addr, kproc->data->boot_align_addr); - ret = -EINVAL; - goto put_mbox; + return -EINVAL; } dev_err(dev, "booting DSP core using boot addr = 0x%x\n", boot_addr); ret = ti_sci_proc_set_config(kproc->tsp, boot_addr, 0, 0); if (ret) - goto put_mbox; + return ret; ret = k3_dsp_rproc_release(kproc); if (ret) - goto put_mbox; + return ret; return 0; - -put_mbox: - mbox_free_channel(kproc->mbox); - return ret; } /* @@ -353,8 +345,6 @@ static int k3_dsp_rproc_stop(struct rproc *rproc) { struct k3_dsp_rproc *kproc = rproc->priv; - mbox_free_channel(kproc->mbox); - k3_dsp_rproc_reset(kproc); return 0; @@ -363,42 +353,22 @@ static int k3_dsp_rproc_stop(struct rproc *rproc) /* * Attach to a running DSP remote processor (IPC-only mode) * - * This rproc attach callback only needs to request the mailbox, the remote - * processor is already booted, so there is no need to issue any TI-SCI - * commands to boot the DSP core. This callback is invoked only in IPC-only - * mode. + * This rproc attach callback is a NOP. The remote processor is already booted, + * and all required resources have been acquired during probe routine, so there + * is no need to issue any TI-SCI commands to boot the DSP core. This callback + * is invoked only in IPC-only mode and exists because rproc_validate() checks + * for its existence. */ -static int k3_dsp_rproc_attach(struct rproc *rproc) -{ - struct k3_dsp_rproc *kproc = rproc->priv; - struct device *dev = kproc->dev; - int ret; - - ret = k3_dsp_rproc_request_mbox(rproc); - if (ret) - return ret; - - dev_info(dev, "DSP initialized in IPC-only mode\n"); - return 0; -} +static int k3_dsp_rproc_attach(struct rproc *rproc) { return 0; } /* * Detach from a running DSP remote processor (IPC-only mode) * - * This rproc detach callback performs the opposite operation to attach callback - * and only needs to release the mailbox, the DSP core is not stopped and will - * be left to continue to run its booted firmware. This callback is invoked only - * in IPC-only mode. + * This rproc detach callback is a NOP. The DSP core is not stopped and will be + * left to continue to run its booted firmware. This callback is invoked only in + * IPC-only mode and exists for sanity sake. */ -static int k3_dsp_rproc_detach(struct rproc *rproc) -{ - struct k3_dsp_rproc *kproc = rproc->priv; - struct device *dev = kproc->dev; - - mbox_free_channel(kproc->mbox); - dev_info(dev, "DSP deinitialized in IPC-only mode\n"); - return 0; -} +static int k3_dsp_rproc_detach(struct rproc *rproc) { return 0; } /* * This function implements the .get_loaded_rsc_table() callback and is used @@ -697,6 +667,10 @@ static int k3_dsp_rproc_probe(struct platform_device *pdev) kproc->dev = dev; kproc->data = data; + ret = k3_dsp_rproc_request_mbox(rproc); + if (ret) + return ret; + kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci"); if (IS_ERR(kproc->ti_sci)) return dev_err_probe(dev, PTR_ERR(kproc->ti_sci), @@ -789,6 +763,8 @@ static void k3_dsp_rproc_remove(struct platform_device *pdev) if (ret) dev_err(dev, "failed to detach proc (%pe)\n", ERR_PTR(ret)); } + + mbox_free_channel(kproc->mbox); } static const struct k3_dsp_mem_data c66_mems[] = { -- 2.34.1