linux-kernel - [PATCH] media: amphion: support for reloading module

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Date:   Tue, 17 May 2022 16:01:16 +0800
From:   Ming Qian <ming.qian@....com>
To:     mchehab@...nel.org, hverkuil-cisco@...all.nl
Cc:     shawnguo@...nel.org, robh+dt@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] media: amphion: support for reloading module

As there is no interface to power off vpu core.
So it need to boot from cold on first load.
but on the second load, driver need to restore the status
instead of booting.

Signed-off-by: Ming Qian <ming.qian@....com>
---
 drivers/media/platform/amphion/vpu_core.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/media/platform/amphion/vpu_core.c b/drivers/media/platform/amphion/vpu_core.c
index 68ad183925fd..3cca7ae2355d 100644
--- a/drivers/media/platform/amphion/vpu_core.c
+++ b/drivers/media/platform/amphion/vpu_core.c
@@ -257,14 +257,8 @@ static int vpu_core_register(struct device *dev, struct vpu_core *core)
 	}
 
 	list_add_tail(&core->list, &vpu->cores);
-
 	vpu_core_get_vpu(core);
 
-	if (vpu_iface_get_power_state(core))
-		ret = vpu_core_restore(core);
-	if (ret)
-		goto error;
-
 	return 0;
 error:
 	if (core->msg_buffer) {
@@ -362,7 +356,10 @@ struct vpu_core *vpu_request_core(struct vpu_dev *vpu, enum vpu_core_type type)
 	pm_runtime_resume_and_get(core->dev);
 
 	if (core->state == VPU_CORE_DEINIT) {
-		ret = vpu_core_boot(core, true);
+		if (vpu_iface_get_power_state(core))
+			ret = vpu_core_restore(core);
+		else
+			ret = vpu_core_boot(core, true);
 		if (ret) {
 			pm_runtime_put_sync(core->dev);
 			mutex_unlock(&core->lock);
-- 
2.36.1