[PATCH v11 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort driver

[Rex-BC Chen]

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 at baylibre.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 at mediatek.com>
> > 
> > Signed-off-by: Markus Schneider-Pargmann <msp at baylibre.com>
> > Signed-off-by: Guillaume Ranquet <granquet at baylibre.com>
> > [Bo-Chen: Cleanup the drivers and modify comments from reviewers]
> > Signed-off-by: Bo-Chen Chen <rex-bc.chen at mediatek.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;
> > +}
> 
>