> Subject: [PATCH 2/7] firmware: imx: scu: Support reception of messages of > any size
Could fast_ipc be used for your case? I am not fans to use the legacy method which is error prone. Thanks, Peng. > > From: Franck LENORMAND <[email protected]> > > The word of a message can arrive in any order and the current driver cannot > receive more than 4-word message. > > To fix this, a new variable rx_pos is added to imx_sc_chan structure to save > the position at which the word receive must be stored. > > The position is initialized by the index of the channel. > > The position is incremented by SCU_MU_RX_CHAN_NUM each time a word > is received on the channel. > > This allow the words to be received in any order and be stored in the > expected order. > > Signed-off-by: Franck LENORMAND <[email protected]> > --- > drivers/firmware/imx/imx-scu.c | 21 +++++++++++++++------ > 1 file changed, 15 insertions(+), 6 deletions(-) > > diff --git a/drivers/firmware/imx/imx-scu.c b/drivers/firmware/imx/imx-scu.c > index 2ab0482..7c13595 100644 > --- a/drivers/firmware/imx/imx-scu.c > +++ b/drivers/firmware/imx/imx-scu.c > @@ -1,6 +1,6 @@ > // SPDX-License-Identifier: GPL-2.0+ > /* > - * Copyright 2018 NXP > + * Copyright 2018,2020 NXP > * Author: Dong Aisheng <[email protected]> > * > * Implementation of the SCU IPC functions using MUs (client side). > @@ -19,6 +19,8 @@ > #include <linux/of_platform.h> > #include <linux/platform_device.h> > > +#define SCU_MU_TX_CHAN_NUM 4 > +#define SCU_MU_RX_CHAN_NUM 4 > #define SCU_MU_CHAN_NUM 8 > #define MAX_RX_TIMEOUT (msecs_to_jiffies(30)) > > @@ -29,6 +31,7 @@ struct imx_sc_chan { > struct mbox_chan *ch; > int idx; > struct completion tx_done; > + u8 rx_pos; > }; > > struct imx_sc_ipc { > @@ -136,16 +139,14 @@ static void imx_scu_rx_callback(struct mbox_client > *c, void *msg) > return; > } > > - if (sc_chan->idx == 0) { > + if (sc_chan->rx_pos == 0) { > hdr = msg; > sc_ipc->rx_size = hdr->size; > dev_dbg(sc_ipc->dev, "msg rx size %u\n", sc_ipc->rx_size); > - if (sc_ipc->rx_size > 4) > - dev_warn(sc_ipc->dev, "RPC does not support receiving > over 4 > words: %u\n", > - sc_ipc->rx_size); > } > > - sc_ipc->msg[sc_chan->idx] = *data; > + sc_ipc->msg[sc_chan->rx_pos] = *data; > + sc_chan->rx_pos += SCU_MU_RX_CHAN_NUM; > sc_ipc->count++; > > dev_dbg(sc_ipc->dev, "mu %u msg %u 0x%x\n", sc_chan->idx, @@ > -205,6 +206,7 @@ int imx_scu_call_rpc(struct imx_sc_ipc *sc_ipc, void *msg, > bool have_resp) > uint8_t saved_svc, saved_func; > struct imx_sc_rpc_msg *hdr; > int ret; > + int i; > > if (WARN_ON(!sc_ipc || !msg)) > return -EINVAL; > @@ -212,6 +214,13 @@ int imx_scu_call_rpc(struct imx_sc_ipc *sc_ipc, void > *msg, bool have_resp) > mutex_lock(&sc_ipc->lock); > reinit_completion(&sc_ipc->done); > > + /* Set the indexes for the reception chans */ > + for (i = SCU_MU_TX_CHAN_NUM; i < SCU_MU_CHAN_NUM; i++) { > + struct imx_sc_chan *sc_chan = &sc_ipc->chans[i]; > + > + sc_chan->rx_pos = sc_chan->idx; > + } > + > if (have_resp) { > sc_ipc->msg = msg; > saved_svc = ((struct imx_sc_rpc_msg *)msg)->svc; > -- > 2.7.4
