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SubjectRe: [PATCH v3 4/7] drm/exynos/hdmi: add bridge support


2017년 02월 01일 17:29에 Andrzej Hajda 이(가) 쓴 글:
> On TM2/TM2e platforms HDMI output is connected to MHL bridge
> SiI8620. To allow configure UltraHD modes on the bridge
> and to eliminate unsupported modes this bridge should be
> attached to drm_encoder implemented in exynos_hdmi.
>
> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
> ---
> drivers/gpu/drm/exynos/exynos_hdmi.c | 56 +++++++++++++++++++++++++++++-------
> 1 file changed, 46 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
> index a73b192..41fb894 100644
> --- a/drivers/gpu/drm/exynos/exynos_hdmi.c
> +++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
> @@ -35,6 +35,7 @@
> #include <linux/io.h>
> #include <linux/of_address.h>
> #include <linux/of_device.h>
> +#include <linux/of_graph.h>
> #include <linux/hdmi.h>
> #include <linux/component.h>
> #include <linux/mfd/syscon.h>
> @@ -133,6 +134,7 @@ struct hdmi_context {
> struct regulator_bulk_data regul_bulk[ARRAY_SIZE(supply)];
> struct regulator *reg_hdmi_en;
> struct exynos_drm_clk phy_clk;
> + struct drm_bridge *bridge;
> };
>
> static inline struct hdmi_context *encoder_to_hdmi(struct drm_encoder *e)
> @@ -922,7 +924,15 @@ static int hdmi_create_connector(struct drm_encoder *encoder)
> drm_connector_register(connector);
> drm_mode_connector_attach_encoder(connector, encoder);
>
> - return 0;
> + if (hdata->bridge) {
> + encoder->bridge = hdata->bridge;
> + hdata->bridge->encoder = encoder;
> + ret = drm_bridge_attach(encoder->dev, hdata->bridge);

arguments of drm_bridge_attach function has been changed so fixed it - trivial thing.
Applied it including other patches.

Thanks,
Inki Dae

> + if (ret)
> + DRM_ERROR("Failed to attach bridge\n");
> + }
> +
> + return ret;
> }
>
> static bool hdmi_mode_fixup(struct drm_encoder *encoder,
> @@ -1591,6 +1601,31 @@ static void hdmiphy_clk_enable(struct exynos_drm_clk *clk, bool enable)
> hdmiphy_disable(hdata);
> }
>
> +static int hdmi_bridge_init(struct hdmi_context *hdata)
> +{
> + struct device *dev = hdata->dev;
> + struct device_node *ep, *np;
> +
> + ep = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
> + if (!ep)
> + return 0;
> +
> + np = of_graph_get_remote_port_parent(ep);
> + of_node_put(ep);
> + if (!np) {
> + DRM_ERROR("failed to get remote port parent");
> + return -EINVAL;
> + }
> +
> + hdata->bridge = of_drm_find_bridge(np);
> + of_node_put(np);
> +
> + if (!hdata->bridge)
> + return -EPROBE_DEFER;
> +
> + return 0;
> +}
> +
> static int hdmi_resources_init(struct hdmi_context *hdata)
> {
> struct device *dev = hdata->dev;
> @@ -1630,17 +1665,18 @@ static int hdmi_resources_init(struct hdmi_context *hdata)
>
> hdata->reg_hdmi_en = devm_regulator_get_optional(dev, "hdmi-en");
>
> - if (PTR_ERR(hdata->reg_hdmi_en) == -ENODEV)
> - return 0;
> + if (PTR_ERR(hdata->reg_hdmi_en) != -ENODEV) {
> + if (IS_ERR(hdata->reg_hdmi_en))
> + return PTR_ERR(hdata->reg_hdmi_en);
>
> - if (IS_ERR(hdata->reg_hdmi_en))
> - return PTR_ERR(hdata->reg_hdmi_en);
> -
> - ret = regulator_enable(hdata->reg_hdmi_en);
> - if (ret)
> - DRM_ERROR("failed to enable hdmi-en regulator\n");
> + ret = regulator_enable(hdata->reg_hdmi_en);
> + if (ret) {
> + DRM_ERROR("failed to enable hdmi-en regulator\n");
> + return ret;
> + }
> + }
>
> - return ret;
> + return hdmi_bridge_init(hdata);
> }
>
> static struct of_device_id hdmi_match_types[] = {
>

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