linux-kernel - Re: [PATCH v11 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort driver

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Message-ID: <b609f8db2a2ae9f5c9e3b6bc60498115bb054990.camel@mediatek.com>
Date:   Tue, 21 Jun 2022 20:36:37 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "mripard@...nel.org" <mripard@...nel.org>,
        "tzimmermann@...e.de" <tzimmermann@...e.de>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "deller@....de" <deller@....de>,
        "airlied@...ux.ie" <airlied@...ux.ie>
CC:     "msp@...libre.com" <msp@...libre.com>,
        "granquet@...libre.com" <granquet@...libre.com>,
        Jitao Shi (石记涛) 
        <jitao.shi@...iatek.com>,
        "wenst@...omium.org" <wenst@...omium.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v11 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort
 driver

On Mon, 2022-06-20 at 11:54 +0800, CK Hu wrote:
> Hi, Rex:
> 
> On Fri, 2022-06-10 at 18:55 +0800, Bo-Chen Chen wrote:
> > From: Markus Schneider-Pargmann <msp@...libre.com>
> > 
> > This patch adds a embedded displayport driver for the MediaTek
> > mt8195
> > SoC.
> > 
> > It supports the MT8195, the embedded DisplayPort units. It offers
> > DisplayPort 1.4 with up to 4 lanes.
> > 
> > The driver creates a child device for the phy. The child device
> > will
> > never exist without the parent being active. As they are sharing a
> > register range, the parent passes a regmap pointer to the child so
> > that
> > both can work with the same register range. The phy driver sets
> > device
> > data that is read by the parent to get the phy device that can be
> > used
> > to control the phy properties.
> > 
> > This driver is based on an initial version by
> > Jitao shi <jitao.shi@...iatek.com>
> > 
> > Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> > Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> > [Bo-Chen: Cleanup the drivers and modify comments from reviewers]
> > Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> > ---
> 
> [snip]
> 
> > +
> > +static int mtk_dp_bridge_atomic_check(struct drm_bridge *bridge,
> > +				      struct drm_bridge_state
> > *bridge_state,
> > +				      struct drm_crtc_state
> > *crtc_state,
> > +				      struct drm_connector_state
> > *conn_state)
> > +{
> > +	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
> > +	struct drm_crtc *crtc = conn_state->crtc;
> > +	unsigned int input_bus_format;
> > +
> > +	input_bus_format = bridge_state->input_bus_cfg.format;
> > +
> > +	dev_dbg(mtk_dp->dev, "input format 0x%04x, output format
> > 0x%04x\n",
> > +		bridge_state->input_bus_cfg.format,
> > +		 bridge_state->output_bus_cfg.format);
> > +
> > +	mtk_dp->input_fmt = input_bus_format;
> > +	if (mtk_dp->input_fmt == MEDIA_BUS_FMT_YUYV8_1X16)
> 
> input_fmt is used only in this function, so let it be local variable.
> 
> Regards,
> CK
> 

ok, I will do this.

BRs,
Bo-Chen

> > +		mtk_dp->info.format = DP_PIXELFORMAT_YUV422;
> > +	else
> > +		mtk_dp->info.format = DP_PIXELFORMAT_RGB;
> > +
> > +	if (!crtc) {
> > +		drm_err(mtk_dp->drm_dev,
> > +			"Can't enable bridge as connector state doesn't
> > have a crtc\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	mtk_dp_parse_drm_mode_timings(mtk_dp, &crtc_state-
> > > adjusted_mode);
> > 
> > +	if (mtk_dp_parse_capabilities(mtk_dp)) {
> > +		drm_err(mtk_dp->drm_dev,
> > +			"Can't enable bridge as nothing is plugged
> > in\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	return 0;
> > +}
> 
>