linux-kernel - [PATCH v2] media: nxp: imx8-isi: Add suspend/resume support for ISI mem2mem

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Message-Id: <20250815-isi_m2m-v2-1-32e3720880cc@nxp.com>
Date: Fri, 15 Aug 2025 17:28:51 +0800
From: Guoniu Zhou <guoniu.zhou@....com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Frank Li <Frank.Li@....com>
Cc: linux-media@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Guoniu Zhou <guoniu.zhou@....com>
Subject: [PATCH v2] media: nxp: imx8-isi: Add suspend/resume support for
 ISI mem2mem

Add suspend/resume support for ISI when work at memory to memory mode.

Signed-off-by: Guoniu Zhou <guoniu.zhou@....com>
Reviewed-by: Frank Li <Frank.Li@....com>
---
Changes in v2:
  - Move mxc_isi_m2m_suspend()/resume() out of loop.
  - Replace ctx->chained with m2m->chained_count.
  - Link to v1: https://lore.kernel.org/all/20250717024353.1811576-1-guoniu.zhou@oss.nxp.com/
---
 .../media/platform/nxp/imx8-isi/imx8-isi-core.c    |  9 ++++++
 .../media/platform/nxp/imx8-isi/imx8-isi-core.h    | 11 +++++++
 drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c | 34 ++++++++++++++++++++++
 3 files changed, 54 insertions(+)

diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
index 981648a0311374597a033a7ecbf39f7b0b252cb0..408e9cb61554d05ac92562c322d6a728080bb9e5 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
@@ -374,6 +374,8 @@ static int mxc_isi_pm_suspend(struct device *dev)
 		mxc_isi_video_suspend(pipe);
 	}
 
+	mxc_isi_m2m_suspend(&isi->m2m);
+
 	return pm_runtime_force_suspend(dev);
 }
 
@@ -403,6 +405,13 @@ static int mxc_isi_pm_resume(struct device *dev)
 		}
 	}
 
+	ret = mxc_isi_m2m_resume(&isi->m2m);
+	if (ret) {
+		dev_err(dev, "Failed to resume ISI%u (%d) for m2m\n", i,
+			ret);
+		err = ret;
+	}
+
 	return err;
 }
 
diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.h b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.h
index 206995bedca4a4c5d7873f3bc872fbae18b3cb75..6493eef907010934217d9f14a0d6d56acdc59ee0 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.h
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.h
@@ -343,6 +343,8 @@ int mxc_isi_video_buffer_prepare(struct mxc_isi_dev *isi, struct vb2_buffer *vb2
 #ifdef CONFIG_VIDEO_IMX8_ISI_M2M
 int mxc_isi_m2m_register(struct mxc_isi_dev *isi, struct v4l2_device *v4l2_dev);
 int mxc_isi_m2m_unregister(struct mxc_isi_dev *isi);
+void mxc_isi_m2m_suspend(struct mxc_isi_m2m *m2m);
+int mxc_isi_m2m_resume(struct mxc_isi_m2m *m2m);
 #else
 static inline int mxc_isi_m2m_register(struct mxc_isi_dev *isi,
 				       struct v4l2_device *v4l2_dev)
@@ -353,6 +355,15 @@ static inline int mxc_isi_m2m_unregister(struct mxc_isi_dev *isi)
 {
 	return 0;
 }
+
+static inline void mxc_isi_m2m_suspend(struct mxc_isi_m2m *m2m)
+{
+}
+
+static inline int mxc_isi_m2m_resume(struct mxc_isi_m2m *m2m)
+{
+	return 0;
+}
 #endif
 
 int mxc_isi_channel_acquire(struct mxc_isi_pipe *pipe,
diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c
index 22e49d3a128732c077beb7ac2e2f688e0899f8e2..26361fe2ca858098d907d4a0719b0fdacc6becd2 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c
@@ -732,6 +732,40 @@ static const struct v4l2_file_operations mxc_isi_m2m_fops = {
 	.mmap		= v4l2_m2m_fop_mmap,
 };
 
+/* -----------------------------------------------------------------------------
+ * Suspend & resume
+ */
+
+void mxc_isi_m2m_suspend(struct mxc_isi_m2m *m2m)
+{
+	if (m2m->usage_count == 0)
+		return;
+
+	v4l2_m2m_suspend(m2m->m2m_dev);
+
+	if (m2m->chained_count > 0)
+		mxc_isi_channel_unchain(m2m->pipe);
+
+	mxc_isi_channel_disable(m2m->pipe);
+	mxc_isi_channel_put(m2m->pipe);
+}
+
+int mxc_isi_m2m_resume(struct mxc_isi_m2m *m2m)
+{
+	if (m2m->usage_count == 0)
+		return 0;
+
+	mxc_isi_channel_get(m2m->pipe);
+
+	if (m2m->chained_count > 0)
+		mxc_isi_channel_chain(m2m->pipe, false);
+
+	m2m->last_ctx = NULL;
+	v4l2_m2m_resume(m2m->m2m_dev);
+
+	return 0;
+}
+
 /* -----------------------------------------------------------------------------
  * Registration
  */

---
base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585
change-id: 20250815-isi_m2m-3db166a97969

Best regards,
-- 
Guoniu Zhou <guoniu.zhou@....com>