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Date: Mon, 18 Sep 2023 17:40:08 +0300
From: Daniel Baluta <daniel.baluta@...il.com>
To: Peng Fan <peng.fan@....com>
Cc: "Peng Fan (OSS)" <peng.fan@....nxp.com>,
Jassi Brar <jassisinghbrar@...il.com>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
dl-linux-imx <linux-imx@....com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Aisheng Dong <aisheng.dong@....com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/2] mailbox: imx: support channel type tx doorbell v2
On Mon, Sep 18, 2023 at 3:01 PM Peng Fan <peng.fan@....com> wrote:
>
> Hi Daniel,
>
> > Subject: Re: [PATCH 2/2] mailbox: imx: support channel type tx doorbell v2
> >
> > On Sun, Sep 17, 2023 at 5:45 PM Peng Fan (OSS) <peng.fan@....nxp.com>
> > wrote:
> > >
> > > From: Peng Fan <peng.fan@....com>
> > >
> > > The Message Unit(MU) General Purpose Control registers are used for TX
> > > doorbell, but there is no hardware ACK support.
> > >
> > > The current TX doorbell channel is using tasklet to emulate hardware
> > > ACK support to kick the TX tick from controller driver side.
> > >
> > > The new added TX doorbell channel V2 not using tasklet to emulate the
> > > hardware ACK support. The behavior for the channel is just writing the
> > > GCR register, and no else. This will be used for SCMI mailbox.
> > >
> > > Signed-off-by: Peng Fan <peng.fan@....com>
> > > ---
> > > drivers/mailbox/imx-mailbox.c | 32 +++++++++++++++++++++++++++++---
> > > 1 file changed, 29 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/mailbox/imx-mailbox.c
> > > b/drivers/mailbox/imx-mailbox.c index 3ef4dd8adf5d..0af739ab571c
> > > 100644
> > > --- a/drivers/mailbox/imx-mailbox.c
> > > +++ b/drivers/mailbox/imx-mailbox.c
> > > @@ -20,7 +20,9 @@
> > > #include <linux/suspend.h>
> > > #include <linux/slab.h>
> > >
> > > -#define IMX_MU_CHANS 17
> > > +#include "mailbox.h"
> > > +
> > > +#define IMX_MU_CHANS 24
> > > /* TX0/RX0/RXDB[0-3] */
> > > #define IMX_MU_SCU_CHANS 6
> > > /* TX0/RX0 */
> > > @@ -39,6 +41,7 @@ enum imx_mu_chan_type {
> > > IMX_MU_TYPE_TXDB = 2, /* Tx doorbell */
> > > IMX_MU_TYPE_RXDB = 3, /* Rx doorbell */
> > > IMX_MU_TYPE_RST = 4, /* Reset */
> > > + IMX_MU_TYPE_TXDB_V2 = 5, /* Tx doorbell with S/W ACK */
> > > };
> > >
> > > enum imx_mu_xcr {
> > > @@ -226,6 +229,9 @@ static int imx_mu_generic_tx(struct imx_mu_priv
> > *priv,
> > > imx_mu_xcr_rmw(priv, IMX_MU_GCR, IMX_MU_xCR_GIRn(priv-
> > >dcfg->type, cp->idx), 0);
> > > tasklet_schedule(&cp->txdb_tasklet);
> > > break;
> > > + case IMX_MU_TYPE_TXDB_V2:
> > > + imx_mu_xcr_rmw(priv, IMX_MU_GCR, IMX_MU_xCR_GIRn(priv-
> > >dcfg->type, cp->idx), 0);
> > > + break;
> > > default:
> > > dev_warn_ratelimited(priv->dev, "Send data on wrong channel
> > type: %d\n", cp->type);
> > > return -EINVAL;
> > > @@ -554,6 +560,9 @@ static int imx_mu_startup(struct mbox_chan *chan)
> > > int ret;
> > >
> > > pm_runtime_get_sync(priv->dev);
> > > + if (cp->type == IMX_MU_TYPE_TXDB_V2)
> > > + return 0;
> > > +
> > > if (cp->type == IMX_MU_TYPE_TXDB) {
> > > /* Tx doorbell don't have ACK support */
> > > tasklet_init(&cp->txdb_tasklet, imx_mu_txdb_tasklet,
> > > @@ -595,6 +604,11 @@ static void imx_mu_shutdown(struct mbox_chan
> > *chan)
> > > int ret;
> > > u32 sr;
> > >
> > > + if (cp->type == IMX_MU_TYPE_TXDB_V2) {
> > > + pm_runtime_put_sync(priv->dev);
> > > + return;
> > > + }
> > > +
> > > if (cp->type == IMX_MU_TYPE_TXDB) {
> > > tasklet_kill(&cp->txdb_tasklet);
> > > pm_runtime_put_sync(priv->dev); @@ -671,6 +685,7 @@
> > > static struct mbox_chan *imx_mu_specific_xlate(struct mbox_controller
> > > *mbox, static struct mbox_chan * imx_mu_xlate(struct mbox_controller
> > *mbox,
> > > const struct of_phandle_args
> > > *sp) {
> > > + struct mbox_chan *p_chan;
> > > u32 type, idx, chan;
> > >
> > > if (sp->args_count != 2) {
> > > @@ -680,14 +695,25 @@ static struct mbox_chan * imx_mu_xlate(struct
> > > mbox_controller *mbox,
> > >
> > > type = sp->args[0]; /* channel type */
> > > idx = sp->args[1]; /* index */
> > > - chan = type * 4 + idx;
> > >
> > > + /* RST only supports 1 channel */
> > > + if ((type == IMX_MU_TYPE_RST) && idx) {
> > > + dev_err(mbox->dev, "Invalid RST channel %d\n", idx);
> > > + return ERR_PTR(-EINVAL);
> > > + }
> >
> > I don't understand how is this related to introduction of a new doorbell
> > channel. Can you please add it in a separate patch with proper explanation?
>
> RST only supports 1 channel, but its value is 4, so here I extend to 4 channel
> for RST in code, to make the calculation a bit easier to get TXDB_V2 channel
> pointer. But from user side, nothing changed
>
> IMX_MU_TYPE_RST = 4, /* Reset */
> IMX_MU_TYPE_TXDB_V2 = 5, /* Tx doorbell with S/W ACK */
>
> It does not make much sense to separate this change, because this change
> Would only make sense together with TXDB_V2 changes.
Ok, I see. Good for me, then.
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