Fwd: [PATCH v5 5/6] drm/rockchip: dw_hdmi: store rockchip_hdmi reference in phy_data object

[Zheng Yang]

Hi, Heiko:

Reviewed-by: zhengyang <zhengyang at rock-chips.com>

>
> When using special phy handling operations we'll often need access to
> the rockchip_hdmi struct.
>
> As the chip-data that occupies the phy_data pointer initially gets
> assigned to the rockchip_hdmi struct, we can now re-use this phy_data
> pointer to hold the reference to the rockchip_hdmi struct and use this
> reference later on.
>
> Inspiration for this comes from meson and sunxi dw-hdmi, which are using
> the same method.
>
> Signed-off-by: Heiko Stuebner <heiko at sntech.de>
> Tested-by: Robin Murphy <robin.murphy at arm.com>
>
> changes in v3:
> - reword commit message
> ---
>  drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c 
> b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> index 57e76dfd5f6d..19f002fa0a09 100644
> --- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> @@ -335,7 +335,7 @@ static int dw_hdmi_rockchip_bind(struct device 
> *dev, struct device *master,
>                   void *data)
>  {
>      struct platform_device *pdev = to_platform_device(dev);
> -    const struct dw_hdmi_plat_data *plat_data;
> +    struct dw_hdmi_plat_data *plat_data;
>      const struct of_device_id *match;
>      struct drm_device *drm = data;
>      struct drm_encoder *encoder;
> @@ -350,9 +350,14 @@ static int dw_hdmi_rockchip_bind(struct device 
> *dev, struct device *master,
>          return -ENOMEM;
>       match = of_match_node(dw_hdmi_rockchip_dt_ids, pdev->dev.of_node);
> -    plat_data = match->data;
> +    plat_data = devm_kmemdup(&pdev->dev, match->data,
> +                         sizeof(*plat_data), GFP_KERNEL);
> +    if (!plat_data)
> +        return -ENOMEM;
> +
>      hdmi->dev = &pdev->dev;
>      hdmi->chip_data = plat_data->phy_data;
> +    plat_data->phy_data = hdmi;
>      encoder = &hdmi->encoder;
>       encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, 
> dev->of_node);