linux-kernel - Re: [PATCH v4 4/5] media: platform: mediatek: isp

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Date: Mon, 18 Mar 2024 03:50:25 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "jstephan@...libre.com" <jstephan@...libre.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>, "linux-media@...r.kernel.org"
	<linux-media@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "paul.elder@...asonboard.com"
	<paul.elder@...asonboard.com>, "mchehab@...nel.org" <mchehab@...nel.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	Andy Hsieh (謝智皓) <Andy.Hsieh@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "krzysztof.kozlowski+dt@...aro.org"
	<krzysztof.kozlowski+dt@...aro.org>, Louis Kuo (郭德寧)
	<louis.kuo@...iatek.com>, "laurent.pinchart@...asonboard.com"
	<laurent.pinchart@...asonboard.com>, "fsylvestre@...libre.com"
	<fsylvestre@...libre.com>, "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>, "pnguyen@...libre.com"
	<pnguyen@...libre.com>
Subject: Re: [PATCH v4 4/5] media: platform: mediatek: isp_30: add mediatek
 ISP3.0 camsv

Hi, Julien:

On Wed, 2024-01-10 at 15:14 +0100, Julien Stephan wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  From: Phi-bang Nguyen <pnguyen@...libre.com>
> 
> This driver provides a path to bypass the SoC ISP so that image data
> coming from the SENINF can go directly into memory without any image
> processing. This allows the use of an external ISP.
> 
> Signed-off-by: Phi-bang Nguyen <pnguyen@...libre.com>
> Signed-off-by: Florian Sylvestre <fsylvestre@...libre.com>
> [Paul Elder fix irq locking]
> Signed-off-by: Paul Elder <paul.elder@...asonboard.com>
> Co-developed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Co-developed-by: Julien Stephan <jstephan@...libre.com>
> Signed-off-by: Julien Stephan <jstephan@...libre.com>
> ---

[snip]

> +static void mtk_camsv30_setup(struct mtk_cam_dev *cam_dev, u32 w,
> u32 h,
> +			      u32 bpl, u32 mbus_fmt)
> +{
> +	const struct mtk_cam_conf *conf = cam_dev->conf;
> +	u32 int_en = INT_ST_MASK_CAMSV;
> +	u32 tmp;
> +	struct mtk_cam_sparams sparams;
> +
> +	fmt_to_sparams(mbus_fmt, &sparams);
> +
> +	if (pm_runtime_resume_and_get(cam_dev->dev) < 0) {
> +		dev_err(cam_dev->dev, "failed to get pm_runtime\n");
> +		return;
> +	}
> +
> +	spin_lock_irq(&cam_dev->irqlock);

I think you should setup hardware when hardware is idle. So this
spinlock is redundant.

Regards,
CK

> +
> +	writel(conf->tg_sen_mode, cam_dev->regs_tg +
> CAMSV_TG_SEN_MODE);
> +
> +	writel((w * sparams.w_factor) << 16U, cam_dev->regs_tg +
> CAMSV_TG_SEN_GRAB_PXL);
> +
> +	writel(h << 16U, cam_dev->regs_tg + CAMSV_TG_SEN_GRAB_LIN);
> +
> +	/* YUV_U2S_DIS: disable YUV sensor unsigned to signed */
> +	writel(0x1000U, cam_dev->regs_tg + CAMSV_TG_PATH_CFG);
> +
> +	/* Reset cam */
> +	writel(CAMSV_SW_RST, cam_dev->regs + CAMSV_SW_CTL);
> +	writel(0x0U, cam_dev->regs + CAMSV_SW_CTL);
> +	writel(CAMSV_IMGO_RST_TRIG, cam_dev->regs + CAMSV_SW_CTL);
> +
> +	readl_poll_timeout_atomic(cam_dev->regs + CAMSV_SW_CTL, tmp,
> +			(tmp == (CAMSV_IMGO_RST_TRIG |
> CAMSV_IMGO_RST_ST)), 10, 200);
> +
> +	writel(0x0U, cam_dev->regs + CAMSV_SW_CTL);
> +
> +	writel(int_en, cam_dev->regs + CAMSV_INT_EN);
> +
> +	writel(conf->module_en | sparams.module_en_pak,
> +	      cam_dev->regs + CAMSV_MODULE_EN);
> +	writel(sparams.fmt_sel, cam_dev->regs + CAMSV_FMT_SEL);
> +	writel(sparams.pak, cam_dev->regs + CAMSV_PAK);
> +
> +	writel(bpl - 1U, cam_dev->regs_img0 + CAMSV_IMGO_SV_XSIZE);
> +	writel(h - 1U, cam_dev->regs_img0 + CAMSV_IMGO_SV_YSIZE);
> +
> +	writel(sparams.imgo_stride | bpl, cam_dev->regs_img0 +
> CAMSV_IMGO_SV_STRIDE);
> +
> +	writel(conf->imgo_con, cam_dev->regs_img0 + CAMSV_IMGO_SV_CON);
> +	writel(conf->imgo_con2, cam_dev->regs_img0 +
> CAMSV_IMGO_SV_CON2);
> +
> +	/* CMOS_EN first */
> +	writel(readl(cam_dev->regs_tg + CAMSV_TG_SEN_MODE) |
> CAMSV_TG_SEN_MODE_CMOS_EN,
> +			cam_dev->regs_tg + CAMSV_TG_SEN_MODE);
> +
> +	/* finally, CAMSV_MODULE_EN : IMGO_EN */
> +	writel(readl(cam_dev->regs + CAMSV_MODULE_EN) |
> CAMSV_MODULE_EN_IMGO_EN,
> +		    cam_dev->regs + CAMSV_MODULE_EN);
> +
> +	spin_unlock_irq(&cam_dev->irqlock);
> +	pm_runtime_put_autosuspend(cam_dev->dev);
> +}
> +