[PATCH 5.10.y-cip 19/22] dmaengine: sh: rz-dmac: Add DMA clock handling
From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: 2021-12-20 13:32:07
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
From: Biju Das <biju.das.jz@bp.renesas.com>
commit 161596fd776a54df922158175ed844804a861c37 upstream.
Currently, DMA clocks are turned on by the bootloader.
This patch adds support for DMA clock handling so that
the driver manages the DMA clocks.
Fixes: 5000d37042a6 ("dmaengine: sh: Add DMAC driver for RZ/G2L SoC")
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210923102451.11403-1-biju.das.jz@bp.renesas.com (local)
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
drivers/dma/sh/rz-dmac.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c
index f9f30cbeccbe..d9f2cfef878e 100644
--- a/drivers/dma/sh/rz-dmac.c
+++ b/drivers/dma/sh/rz-dmac.c@@ -18,6 +18,7 @@ #include <linux/of_dma.h> #include <linux/of_platform.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/slab.h> #include <linux/spinlock.h>
@@ -872,6 +873,13 @@ static int rz_dmac_probe(struct platform_device *pdev) /* Initialize the channels. */ INIT_LIST_HEAD(&dmac->engine.channels); + pm_runtime_enable(&pdev->dev); + ret = pm_runtime_resume_and_get(&pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "pm_runtime_resume_and_get failed\n"); + goto err_pm_disable; + } + for (i = 0; i < dmac->n_channels; i++) { ret = rz_dmac_chan_probe(dmac, &dmac->channels[i], i); if (ret < 0)
@@ -925,6 +933,10 @@ static int rz_dmac_probe(struct platform_device *pdev) channel->lmdesc.base_dma); } + pm_runtime_put(&pdev->dev); +err_pm_disable: + pm_runtime_disable(&pdev->dev); + return ret; }
@@ -943,6 +955,8 @@ static int rz_dmac_remove(struct platform_device *pdev) } of_dma_controller_free(pdev->dev.of_node); dma_async_device_unregister(&dmac->engine); + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); return 0; }
--
2.17.1