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media: ti: j721e-csi2rx: Support runtime suspend

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Add support for runtime power-management to enable powering off the
shared power domain between Cadence CSI2RX and TI CSI2RX wrapper when
the device(s) are not in use.

When powering off the IP, the PSI-L endpoint loses the paired DMA
channels. Thus we have to release the DMA channels at runtime suspend
and request them again at resume.

Tested-by: Rishikesh Donadkar <r-donadkar@ti.com>
Reviewed-by: Rishikesh Donadkar <r-donadkar@ti.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Jai Luthra <jai.luthra@ideasonboard.com>
Co-developed-by: Rishikesh Donadkar <r-donadkar@ti.com>
Signed-off-by: Rishikesh Donadkar <r-donadkar@ti.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
This commit is contained in:
Jai Luthra 2026-05-20 17:30:21 +05:30 committed by Sakari Ailus
parent c85d3d5362
commit c0429f49f4
2 changed files with 54 additions and 3 deletions
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1
drivers/media/platform/ti/Kconfig
View File

@ -83,6 +83,7 @@ config VIDEO_TI_J721E_CSI2RX
depends on VIDEO_CADENCE_CSI2RX
depends on PHY_CADENCE_DPHY_RX || COMPILE_TEST
depends on ARCH_K3 || COMPILE_TEST
depends on PM
select VIDEOBUF2_DMA_CONTIG
select V4L2_FWNODE
help

56
drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c
View File

@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <media/cadence/cdns-csi2rx.h>
@ -964,14 +965,18 @@ static int ti_csi2rx_start_streaming(struct vb2_queue *vq, unsigned int count)
struct ti_csi2rx_dev *csi = ctx->csi;
struct ti_csi2rx_dma *dma = &ctx->dma;
unsigned long flags;
int ret = 0;
int ret;
ret = pm_runtime_resume_and_get(csi->dev);
if (ret)
return ret;
spin_lock_irqsave(&dma->lock, flags);
if (list_empty(&dma->queue))
ret = -EIO;
spin_unlock_irqrestore(&dma->lock, flags);
if (ret)
return ret;
goto err;
ret = video_device_pipeline_start(&ctx->vdev, &csi->pipe);
if (ret)
@ -993,6 +998,8 @@ static int ti_csi2rx_start_streaming(struct vb2_queue *vq, unsigned int count)
writel(0, csi->shim + SHIM_DMACNTX(ctx->idx));
err:
ti_csi2rx_cleanup_buffers(ctx, VB2_BUF_STATE_QUEUED);
pm_runtime_put(csi->dev);
return ret;
}
@ -1012,6 +1019,7 @@ static void ti_csi2rx_stop_streaming(struct vb2_queue *vq)
ti_csi2rx_stop_dma(ctx);
ti_csi2rx_cleanup_buffers(ctx, VB2_BUF_STATE_ERROR);
pm_runtime_put(csi->dev);
}
static const struct vb2_ops csi_vb2_qops = {
@ -1257,7 +1265,9 @@ static void ti_csi2rx_cleanup_notifier(struct ti_csi2rx_dev *csi)
static void ti_csi2rx_cleanup_ctx(struct ti_csi2rx_ctx *ctx)
{
dma_release_channel(ctx->dma.chan);
if (!pm_runtime_status_suspended(ctx->csi->dev))
dma_release_channel(ctx->dma.chan);
vb2_queue_release(&ctx->vidq);
video_unregister_device(&ctx->vdev);
@ -1507,6 +1517,38 @@ static int ti_csi2rx_init_ctx(struct ti_csi2rx_ctx *ctx)
return ret;
}
static int ti_csi2rx_runtime_suspend(struct device *dev)
{
struct ti_csi2rx_dev *csi = dev_get_drvdata(dev);
if (csi->enable_count != 0)
return -EBUSY;
for (unsigned int i = 0; i < csi->num_ctx; i++)
dma_release_channel(csi->ctx[i].dma.chan);
return 0;
}
static int ti_csi2rx_runtime_resume(struct device *dev)
{
struct ti_csi2rx_dev *csi = dev_get_drvdata(dev);
int ret;
for (unsigned int i = 0; i < csi->num_ctx; i++) {
ret = ti_csi2rx_init_dma(&csi->ctx[i]);
if (ret)
return ret;
}
return 0;
}
static const struct dev_pm_ops ti_csi2rx_pm_ops = {
RUNTIME_PM_OPS(ti_csi2rx_runtime_suspend, ti_csi2rx_runtime_resume,
NULL)
};
static int ti_csi2rx_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
@ -1562,6 +1604,9 @@ static int ti_csi2rx_probe(struct platform_device *pdev)
goto err_ctx;
}
pm_runtime_set_active(csi->dev);
pm_runtime_enable(csi->dev);
ret = ti_csi2rx_notifier_register(csi);
if (ret)
goto err_ctx;
@ -1592,6 +1637,9 @@ static void ti_csi2rx_remove(struct platform_device *pdev)
struct ti_csi2rx_dev *csi = platform_get_drvdata(pdev);
unsigned int i;
if (!pm_runtime_status_suspended(&pdev->dev))
pm_runtime_set_suspended(&pdev->dev);
for (i = 0; i < csi->num_ctx; i++)
ti_csi2rx_cleanup_ctx(&csi->ctx[i]);
@ -1599,6 +1647,7 @@ static void ti_csi2rx_remove(struct platform_device *pdev)
ti_csi2rx_cleanup_v4l2(csi);
dma_free_coherent(csi->dev, csi->drain.len, csi->drain.vaddr,
csi->drain.paddr);
pm_runtime_disable(&pdev->dev);
}
static const struct of_device_id ti_csi2rx_of_match[] = {
@ -1613,6 +1662,7 @@ static struct platform_driver ti_csi2rx_pdrv = {
.driver = {
.name = TI_CSI2RX_MODULE_NAME,
.of_match_table = ti_csi2rx_of_match,
.pm = &ti_csi2rx_pm_ops,
},
};