linux-kernel - Re: [PATCH v2 10/14] media: mediatek: vcodec: clean xpc status

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Message-ID: <b294ac666dd770177feb4cfdb977ca0a47095c8d.camel@collabora.com>
Date: Fri, 28 Nov 2025 15:19:07 -0500
From: Nicolas Dufresne <nicolas.dufresne@...labora.com>
To: Yunfei Dong <yunfei.dong@...iatek.com>, Nícolas "F .
 R . A . Prado" <nfraprado@...labora.com>, Sebastian Fricke
 <sebastian.fricke@...labora.com>, Hans Verkuil	 <hverkuil-cisco@...all.nl>,
 AngeloGioacchino Del Regno	 <angelogioacchino.delregno@...labora.com>,
 Benjamin Gaignard	 <benjamin.gaignard@...labora.com>, Nathan Hebert
 <nhebert@...omium.org>,  Daniel Almeida <daniel.almeida@...labora.com>
Cc: Hsin-Yi Wang <hsinyi@...omium.org>, Fritz Koenig
 <frkoenig@...omium.org>,  Daniel Vetter <daniel@...ll.ch>, Steve Cho
 <stevecho@...omium.org>, linux-media@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
	Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2 10/14] media: mediatek: vcodec: clean xpc status

Le vendredi 15 août 2025 à 16:52 +0800, Yunfei Dong a écrit :
> The driver need to clean xpc status when receive decoder hardware
> interrupt for mt8196 platform.
> 
> Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
> ---
>  .../vcodec/decoder/mtk_vcodec_dec_hw.c        | 28 +++++++++++++++++++
>  .../vcodec/decoder/mtk_vcodec_dec_hw.h        | 13 +++++++--
>  2 files changed, 39 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_hw.c b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_hw.c
> index 881d5de41e05..e4e527fe54dc 100644
> --- a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_hw.c
> +++ b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_hw.c
> @@ -61,6 +61,31 @@ static int mtk_vdec_hw_prob_done(struct mtk_vcodec_dec_dev *vdec_dev)
>  	return 0;
>  }
>  
> +static void mtk_vdec_hw_write_reg_mask(void __iomem *reg_base, u32 reg_offset, u32 val, u32 mask)
> +{
> +	void __iomem *reg_addr = reg_base + reg_offset;
> +	u32 reg_val;
> +
> +	reg_val =  readl(reg_addr);
> +	reg_val &= ~mask;
> +	reg_val |= (val & mask);
> +	writel(reg_val, reg_addr);
> +}
> +
> +static void mtk_vdec_hw_clean_xpc(struct mtk_vdec_hw_dev *dev)
> +{
> +	u32 val, mask, addr = VDEC_XPC_CLEAN_ADDR;
> +
> +	if (dev->main_dev->chip_name != MTK_VDEC_MT8196)
> +		return;
> +
> +	val = dev->hw_idx == MTK_VDEC_LAT0 ? VDEC_XPC_LAT_VAL : VDEC_XPC_CORE_VAL;
> +	mask = dev->hw_idx == MTK_VDEC_LAT0 ? VDEC_XPC_LAT_MASK : VDEC_XPC_CORE_MASK;

Avoid repeating conditions, less line does not make it more readable.

if (dev->hw_idx == MTK_VDEC_LAT0) {
	val = VDEC_XPC_LAT_VAL;
	mask = VDEC_XPC_LAT_MASK;
} else {
	val = VDEC_XPC_CORE_VAL;
	mask = VDEC_XPC_CORE_MASK;
}

> +
> +	mtk_vdec_hw_write_reg_mask(dev->reg_base[VDEC_HW_XPC], addr, val, mask);
> +	mtk_vdec_hw_write_reg_mask(dev->reg_base[VDEC_HW_XPC], addr, 0, mask);
> +}
> +
>  static irqreturn_t mtk_vdec_hw_irq_handler(int irq, void *priv)
>  {
>  	struct mtk_vdec_hw_dev *dev = priv;
> @@ -88,6 +113,8 @@ static irqreturn_t mtk_vdec_hw_irq_handler(int irq, void *priv)
>  	writel(dec_done_status | VDEC_IRQ_CFG, vdec_misc_addr);
>  	writel(dec_done_status & ~VDEC_IRQ_CLR, vdec_misc_addr);
>  
> +	mtk_vdec_hw_clean_xpc(dev);
> +
>  	wake_up_dec_ctx(ctx, MTK_INST_IRQ_RECEIVED, dev->hw_idx);
>  
>  	mtk_v4l2_vdec_dbg(3, ctx, "wake up ctx %d, dec_done_status=%x",
> @@ -166,6 +193,7 @@ static int mtk_vdec_hw_probe(struct platform_device *pdev)
>  	subdev_dev->hw_idx = hw_idx;
>  	subdev_dev->main_dev = main_dev;
>  	subdev_dev->reg_base[VDEC_HW_SYS] = main_dev->reg_base[VDEC_HW_SYS];
> +	subdev_dev->reg_base[VDEC_HW_XPC] = main_dev->reg_base[VDEC_HW_MISC];
>  	set_bit(subdev_dev->hw_idx, main_dev->subdev_bitmap);
>  
>  	if (IS_SUPPORT_VDEC_HW_IRQ(hw_idx)) {
> diff --git a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_hw.h b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_hw.h
> index 83fe8b9428e6..50ce6c1d25a2 100644
> --- a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_hw.h
> +++ b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_hw.h
> @@ -18,17 +18,26 @@
>  #define VDEC_IRQ_CLR 0x10
>  #define VDEC_IRQ_CFG_REG 0xa4
>  
> +#define VDEC_XPC_CLEAN_ADDR 0xc
> +#define VDEC_XPC_LAT_VAL BIT(0)
> +#define VDEC_XPC_LAT_MASK BIT(0)
> +
> +#define VDEC_XPC_CORE_VAL BIT(4)
> +#define VDEC_XPC_CORE_MASK BIT(4)
> +
>  #define IS_SUPPORT_VDEC_HW_IRQ(hw_idx) ((hw_idx) != MTK_VDEC_LAT_SOC)
>  
>  /**
>   * enum mtk_vdec_hw_reg_idx - subdev hardware register base index
> - * @VDEC_HW_SYS : vdec soc register index
> + * @VDEC_HW_SYS:  vdec soc register index
>   * @VDEC_HW_MISC: vdec misc register index
> - * @VDEC_HW_MAX : vdec supported max register index
> + * @VDEC_HW_XPC:  vdec xpc register index
> + * @VDEC_HW_MAX:  vdec supported max register index
>   */
>  enum mtk_vdec_hw_reg_idx {
>  	VDEC_HW_SYS,
>  	VDEC_HW_MISC,
> +	VDEC_HW_XPC,
>  	VDEC_HW_MAX
>  };

But otherwise nothing important to report here.

Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>

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