[PATCH 1/2] soc: qcom: rpmh-rsc: Update CMD_MSGID_LEN to 4 bytes for read request

[Maulik Shah <maulik.shah@oss.qualcomm.com>]

Newer SoC like hawi with RSC version v4.5 support 4 byte message read
request instead of default 8 byte on older SoCs. The write request
continues to be 8 bytes.

Update the read request message accordingly on RSC v4.5 and higher.

Signed-off-by: Maulik Shah <maulik.shah@oss.qualcomm.com>
---
 drivers/soc/qcom/rpmh-rsc.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index c4542318eac4..f84a399fa5dc 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -86,6 +86,7 @@ enum {
 #define TCS_AMC_MODE_TRIGGER		BIT(24)
 
 /* TCS CMD register bit mask */
+#define CMD_MSGID_LEN_READ_v4_5		4
 #define CMD_MSGID_LEN			8
 #define CMD_MSGID_RESP_REQ		BIT(8)
 #define CMD_MSGID_WRITE			BIT(16)
@@ -499,15 +500,21 @@ static void __tcs_buffer_write(struct rsc_drv *drv, int tcs_id, int cmd_id,
 			       const struct tcs_request *msg)
 {
 	u32 msgid;
-	u32 cmd_msgid = CMD_MSGID_LEN;
+	u32 cmd_msgid = 0;
 	u32 cmd_enable = 0;
 	struct tcs_cmd *cmd;
 	int i, j;
 
 	/* Convert all commands to RR when the request has wait_for_compl set */
 	cmd_msgid |= msg->wait_for_compl ? CMD_MSGID_RESP_REQ : 0;
-	if (!msg->is_read)
-		cmd_msgid |= CMD_MSGID_WRITE;
+	if (!msg->is_read) {
+		cmd_msgid = CMD_MSGID_LEN | CMD_MSGID_WRITE;
+	} else {
+		if (drv->ver.major >= 4 && drv->ver.minor >= 5)
+			cmd_msgid = CMD_MSGID_LEN_READ_v4_5;
+		else
+			cmd_msgid = CMD_MSGID_LEN;
+	}
 
 	for (i = 0, j = cmd_id; i < msg->num_cmds; i++, j++) {
 		cmd = &msg->cmds[i];

-- 
2.43.0