[PATCH] drm/stm: ltdc: add pinctrl for DPI encoder mode

[Benjamin Gaignard]

Le ven. 6 sept. 2019 à 11:22, Yannick Fertré <yannick.fertre at st.com> a écrit :
>
> The implementation of functions encoder_enable and encoder_disable
> make possible to control the pinctrl according to the encoder type.
> The pinctrl must be activated only if the encoder type is DPI.
> This helps to move the DPI-related pinctrl configuration from
> all the panel or bridge to the LTDC dt node.
>
> Reviewed-by: Philippe Cornu <philippe.cornu at st.com>
>
> Signed-off-by: Yannick Fertré <yannick.fertre at st.com>

Applied on drm-misc-next,
Thanks,
Benjamin

> ---
>  drivers/gpu/drm/stm/ltdc.c | 35 +++++++++++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
>
> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> index 3ab4fbf..1c4fde0 100644
> --- a/drivers/gpu/drm/stm/ltdc.c
> +++ b/drivers/gpu/drm/stm/ltdc.c
> @@ -15,6 +15,7 @@
>  #include <linux/module.h>
>  #include <linux/of_address.h>
>  #include <linux/of_graph.h>
> +#include <linux/pinctrl/consumer.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/reset.h>
> @@ -1040,6 +1041,36 @@ static const struct drm_encoder_funcs ltdc_encoder_funcs = {
>         .destroy = drm_encoder_cleanup,
>  };
>
> +static void ltdc_encoder_disable(struct drm_encoder *encoder)
> +{
> +       struct drm_device *ddev = encoder->dev;
> +
> +       DRM_DEBUG_DRIVER("\n");
> +
> +       /* Set to sleep state the pinctrl whatever type of encoder */
> +       pinctrl_pm_select_sleep_state(ddev->dev);
> +}
> +
> +static void ltdc_encoder_enable(struct drm_encoder *encoder)
> +{
> +       struct drm_device *ddev = encoder->dev;
> +
> +       DRM_DEBUG_DRIVER("\n");
> +
> +       /*
> +        * Set to default state the pinctrl only with DPI type.
> +        * Others types like DSI, don't need pinctrl due to
> +        * internal bridge (the signals do not come out of the chipset).
> +        */
> +       if (encoder->encoder_type == DRM_MODE_ENCODER_DPI)
> +               pinctrl_pm_select_default_state(ddev->dev);
> +}
> +
> +static const struct drm_encoder_helper_funcs ltdc_encoder_helper_funcs = {
> +       .disable = ltdc_encoder_disable,
> +       .enable = ltdc_encoder_enable,
> +};
> +
>  static int ltdc_encoder_init(struct drm_device *ddev, struct drm_bridge *bridge)
>  {
>         struct drm_encoder *encoder;
> @@ -1055,6 +1086,8 @@ static int ltdc_encoder_init(struct drm_device *ddev, struct drm_bridge *bridge)
>         drm_encoder_init(ddev, encoder, &ltdc_encoder_funcs,
>                          DRM_MODE_ENCODER_DPI, NULL);
>
> +       drm_encoder_helper_add(encoder, &ltdc_encoder_helper_funcs);
> +
>         ret = drm_bridge_attach(encoder, bridge, NULL);
>         if (ret) {
>                 drm_encoder_cleanup(encoder);
> @@ -1280,6 +1313,8 @@ int ltdc_load(struct drm_device *ddev)
>
>         clk_disable_unprepare(ldev->pixel_clk);
>
> +       pinctrl_pm_select_sleep_state(ddev->dev);
> +
>         pm_runtime_enable(ddev->dev);
>
>         return 0;
> --
> 2.7.4
>
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