[PATCH 1/2] firmware: arm_scmi: mailbox: share shmem for protocols

[PATCH 1/2] firmware: arm_scmi: mailbox: share shmem for protocols

[peng.fan]

From: Peng Fan <peng.fan@nxp.com>

When shmem property of protocol is not specificed, let it use
its parent's shmem property.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---

Based on Viresh's V6 patchset.

 drivers/firmware/arm_scmi/mailbox.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/firmware/arm_scmi/mailbox.c b/drivers/firmware/arm_scmi/mailbox.c
index 73077bbc4ad9..68ed58e2a47a 100644
--- a/drivers/firmware/arm_scmi/mailbox.c
+++ b/drivers/firmware/arm_scmi/mailbox.c
@@ -69,6 +69,8 @@ static int mailbox_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
 		return -ENOMEM;
 
 	shmem = of_parse_phandle(cdev->of_node, "shmem", idx);
+	if (!shmem)
+		shmem = of_parse_phandle(dev->of_node, "shmem", idx);
 	ret = of_address_to_resource(shmem, 0, &res);
 	of_node_put(shmem);
 	if (ret) {
-- 
2.16.4


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[PATCH 2/2] firmware: arm_scmi: mark channel free when init

[peng.fan]

From: Peng Fan <peng.fan@nxp.com>

The firmware itself might not mark channel free, so let's explicitly 
mark it free when do initialization.

Also move struct scmi_shared_mem to common.h

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/firmware/arm_scmi/common.h  | 19 +++++++++++++++++--
 drivers/firmware/arm_scmi/mailbox.c |  2 ++
 drivers/firmware/arm_scmi/shmem.c   | 18 ------------------
 3 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
index fd091a4ccbff..5df262a564a4 100644
--- a/drivers/firmware/arm_scmi/common.h
+++ b/drivers/firmware/arm_scmi/common.h
@@ -211,8 +211,23 @@ extern const struct scmi_desc scmi_mailbox_desc;
 void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr);
 void scmi_free_channel(struct scmi_chan_info *cinfo, struct idr *idr, int id);
 
-/* shmem related declarations */
-struct scmi_shared_mem;
+/*
+ * SCMI specification requires all parameters, message headers, return
+ * arguments or any protocol data to be expressed in little endian
+ * format only.
+ */
+struct scmi_shared_mem {
+	__le32 reserved;
+	__le32 channel_status;
+#define SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR	BIT(1)
+#define SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE	BIT(0)
+	__le32 reserved1[2];
+	__le32 flags;
+#define SCMI_SHMEM_FLAG_INTR_ENABLED	BIT(0)
+	__le32 length;
+	__le32 msg_header;
+	u8 msg_payload[0];
+};
 
 void shmem_tx_prepare(struct scmi_shared_mem __iomem *shmem,
 		      struct scmi_xfer *xfer);
diff --git a/drivers/firmware/arm_scmi/mailbox.c b/drivers/firmware/arm_scmi/mailbox.c
index 68ed58e2a47a..2d34bf6e94e2 100644
--- a/drivers/firmware/arm_scmi/mailbox.c
+++ b/drivers/firmware/arm_scmi/mailbox.c
@@ -104,6 +104,8 @@ static int mailbox_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
 	cinfo->transport_info = smbox;
 	smbox->cinfo = cinfo;
 
+	iowrite32(BIT(0), &smbox->shmem->channel_status);
+
 	return 0;
 }
 
diff --git a/drivers/firmware/arm_scmi/shmem.c b/drivers/firmware/arm_scmi/shmem.c
index 02c6c7540f42..c9e334654ba3 100644
--- a/drivers/firmware/arm_scmi/shmem.c
+++ b/drivers/firmware/arm_scmi/shmem.c
@@ -11,24 +11,6 @@
 
 #include "common.h"
 
-/*
- * SCMI specification requires all parameters, message headers, return
- * arguments or any protocol data to be expressed in little endian
- * format only.
- */
-struct scmi_shared_mem {
-	__le32 reserved;
-	__le32 channel_status;
-#define SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR	BIT(1)
-#define SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE	BIT(0)
-	__le32 reserved1[2];
-	__le32 flags;
-#define SCMI_SHMEM_FLAG_INTR_ENABLED	BIT(0)
-	__le32 length;
-	__le32 msg_header;
-	u8 msg_payload[0];
-};
-
 void shmem_tx_prepare(struct scmi_shared_mem __iomem *shmem,
 		      struct scmi_xfer *xfer)
 {
-- 
2.16.4


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Re: [PATCH 1/2] firmware: arm_scmi: mailbox: share shmem for protocols

[Sudeep Holla]

On Thu, Feb 06, 2020 at 08:59:25PM +0800, peng.fan@nxp.com wrote:
> From: Peng Fan <peng.fan@nxp.com>
> 
> When shmem property of protocol is not specificed, let it use
> its parent's shmem property.

I had replied already to the thread without ALKML you had sent earlier,
please refer them.

-- 
Regards,
Sudeep

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RE: [PATCH 1/2] firmware: arm_scmi: mailbox: share shmem for protocols

[Peng Fan]

> Subject: Re: [PATCH 1/2] firmware: arm_scmi: mailbox: share shmem for
> protocols
> 
> On Thu, Feb 06, 2020 at 08:57:25PM +0800, peng.fan@nxp.com wrote:
> > From: Peng Fan <peng.fan@nxp.com>
> >
> > When shmem property of protocol is not specificed, let it use its
> > parent's shmem property.
> >
> 

+arm list

> Why do you even need this ? If shmem property of protocol is not specified
> then why is the mailbox property ? Either you need both or none. I don't see
> the point of this patch. I am interested to know how are you even hitting this
> case.

Without this patch, I need add shmem property in each protocol node.
With this patch, I only need to add shmem property in scmi node.

In mailbox_chan_setup, cdev is protocol device, input parameter device
is the parent, saying scmi device.

> 
> If you don't have mailbox property, then chan_available is false and hence we
> don't call chan_setup.

chan_avilable only parse mbox properties, not shmem.

Regards,
Peng.

> 
> --
> Regards,
> Sudeep

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