linux-kernel - Re: [PATCH v4 06/17] media: mtk-jpeg: Get rid of mtk_smi_larb

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Message-ID: <1592472725.20080.12.camel@mhfsdcap03>
Date:   Thu, 18 Jun 2020 17:32:05 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        Rick Chang <rick.chang@...iatek.com>
CC:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
        "Evan Green" <evgreen@...omium.org>,
        Robin Murphy <robin.murphy@....com>,
        "Tomasz Figa" <tfiga@...gle.com>,
        Will Deacon <will.deacon@....com>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <youlin.pei@...iatek.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        "Matthias Kaehlcke" <mka@...omium.org>, <anan.sun@...iatek.com>,
        <cui.zhang@...iatek.com>, <chao.hao@...iatek.com>,
        <ming-fan.chen@...iatek.com>, <eizan@...omium.org>,
        <acourbot@...omium.org>, Rick Chang <rick.chang@...iatek.com>,
        <xia.jiang@...iatek.com>
Subject: Re: [PATCH v4 06/17] media: mtk-jpeg: Get rid of
 mtk_smi_larb_get/put

+ Rick

On Sat, 2020-05-30 at 16:10 +0800, Yong Wu wrote:
> MediaTek IOMMU has already added device_link between the consumer
> and smi-larb device. If the jpg device call the pm_runtime_get_sync,
> the smi-larb's pm_runtime_get_sync also be called automatically.
> 
> CC: Rick Chang <rick.chang@...iatek.com>
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> Reviewed-by: Evan Green <evgreen@...omium.org>
> ---
>  drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c | 22 ----------------------
>  drivers/media/platform/mtk-jpeg/mtk_jpeg_core.h |  2 --
>  2 files changed, 24 deletions(-)
> 
> diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
> index f82a81a..21fba6f 100644
> --- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
> +++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
> @@ -21,7 +21,6 @@
>  #include <media/v4l2-ioctl.h>
>  #include <media/videobuf2-core.h>
>  #include <media/videobuf2-dma-contig.h>
> -#include <soc/mediatek/smi.h>
>  
>  #include "mtk_jpeg_hw.h"
>  #include "mtk_jpeg_core.h"
> @@ -893,11 +892,6 @@ static int mtk_jpeg_queue_init(void *priv, struct vb2_queue *src_vq,
>  
>  static void mtk_jpeg_clk_on(struct mtk_jpeg_dev *jpeg)
>  {
> -	int ret;
> -
> -	ret = mtk_smi_larb_get(jpeg->larb);
> -	if (ret)
> -		dev_err(jpeg->dev, "mtk_smi_larb_get larbvdec fail %d\n", ret);
>  	clk_prepare_enable(jpeg->clk_jdec_smi);
>  	clk_prepare_enable(jpeg->clk_jdec);
>  }
> @@ -906,7 +900,6 @@ static void mtk_jpeg_clk_off(struct mtk_jpeg_dev *jpeg)
>  {
>  	clk_disable_unprepare(jpeg->clk_jdec);
>  	clk_disable_unprepare(jpeg->clk_jdec_smi);
> -	mtk_smi_larb_put(jpeg->larb);
>  }
>  
>  static irqreturn_t mtk_jpeg_dec_irq(int irq, void *priv)
> @@ -1051,21 +1044,6 @@ static int mtk_jpeg_release(struct file *file)
>  
>  static int mtk_jpeg_clk_init(struct mtk_jpeg_dev *jpeg)
>  {
> -	struct device_node *node;
> -	struct platform_device *pdev;
> -
> -	node = of_parse_phandle(jpeg->dev->of_node, "mediatek,larb", 0);
> -	if (!node)
> -		return -EINVAL;
> -	pdev = of_find_device_by_node(node);
> -	if (WARN_ON(!pdev)) {
> -		of_node_put(node);
> -		return -EINVAL;
> -	}
> -	of_node_put(node);
> -
> -	jpeg->larb = &pdev->dev;
> -
>  	jpeg->clk_jdec = devm_clk_get(jpeg->dev, "jpgdec");
>  	if (IS_ERR(jpeg->clk_jdec))
>  		return PTR_ERR(jpeg->clk_jdec);
> diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.h b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.h
> index 999bd14..8579494 100644
> --- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.h
> +++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.h
> @@ -47,7 +47,6 @@ enum mtk_jpeg_ctx_state {
>   * @dec_reg_base:	JPEG registers mapping
>   * @clk_jdec:		JPEG hw working clock
>   * @clk_jdec_smi:	JPEG SMI bus clock
> - * @larb:		SMI device
>   */
>  struct mtk_jpeg_dev {
>  	struct mutex		lock;
> @@ -61,7 +60,6 @@ struct mtk_jpeg_dev {
>  	void __iomem		*dec_reg_base;
>  	struct clk		*clk_jdec;
>  	struct clk		*clk_jdec_smi;
> -	struct device		*larb;
>  };
>  
>  /**