linux-kernel - [PATCH 1/5] i3c: master: svc: enable hotjoin default

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Date:   Mon, 16 Oct 2023 11:46:28 -0400
From:   Frank Li <Frank.Li@....com>
To:     alexandre.belloni@...tlin.com, miquel.raynal@...tlin.com,
        conor.culhane@...vaco.com, joe@...ches.com,
        linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org,
        imx@...ts.linux.dev
Subject: [PATCH 1/5] i3c: master: svc: enable hotjoin default

Hotjoin require clock running and enable SLVSTART irq.
Add module parameter 'hotjoin' to disable hotjoin and enable runtime_pm to
save power.

Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/i3c/master/svc-i3c-master.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index 18bc277edc8a..f0d99b029e5f 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -128,6 +128,9 @@
 /* This parameter depends on the implementation and may be tuned */
 #define SVC_I3C_FIFO_SIZE 16
 
+static bool hotjoin = true;
+module_param(hotjoin, bool, S_IRUGO | S_IWUSR);
+
 struct svc_i3c_cmd {
 	u8 addr;
 	bool rnw;
@@ -1623,8 +1626,12 @@ static int svc_i3c_master_probe(struct platform_device *pdev)
 	if (ret)
 		goto rpm_disable;
 
-	pm_runtime_mark_last_busy(&pdev->dev);
-	pm_runtime_put_autosuspend(&pdev->dev);
+	if (hotjoin) {
+		svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART);
+	} else {
+		pm_runtime_mark_last_busy(&pdev->dev);
+		pm_runtime_put_autosuspend(&pdev->dev);
+	}
 
 	return 0;
 
-- 
2.34.1