[PATCH v2] drm/hisilicon: Add the mode_valid function

[Xinliang Liu]

Thanks for the patch.
Applied to drm-misc-next.

On Wed, 8 Jan 2020 at 17:41, Tian Tao <tiantao6 at hisilicon.com> wrote:

> add mode_valid function, we can make sure the resolution is valid.
>
> Signed-off-by: Tian Tao <tiantao6 at hisilicon.com>
> Signed-off-by: Gong junjie <gongjunjie2 at huawei.com>
> Reviewed-by: Thomas Zimmermann <tzimmermann at suse.de>
>
> ---
> v2:     declare hibmc_crtc_mode_valid as static.
>         Modify the return value of hibmc_crtc_mode_valid .
> ---
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> index 843d784..675d629 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> @@ -242,6 +242,24 @@ static void hibmc_crtc_atomic_disable(struct drm_crtc
> *crtc,
>         hibmc_set_current_gate(priv, reg);
>  }
>
> +static enum drm_mode_status hibmc_crtc_mode_valid(struct drm_crtc *crtc,
> +                                       const struct drm_display_mode
> *mode)
> +{
> +       int i = 0;
> +       int vrefresh = drm_mode_vrefresh(mode);
> +
> +       if (vrefresh < 59 || vrefresh > 61)
> +               return MODE_NOCLOCK;
> +
> +       for (i = 0; i < ARRAY_SIZE(hibmc_pll_table); i++) {
> +               if (hibmc_pll_table[i].hdisplay == mode->hdisplay &&
> +                       hibmc_pll_table[i].vdisplay == mode->vdisplay)
> +                       return MODE_OK;
> +       }
> +
> +       return MODE_BAD;
> +}
> +
>  static unsigned int format_pll_reg(void)
>  {
>         unsigned int pllreg = 0;
> @@ -510,6 +528,7 @@ static const struct drm_crtc_helper_funcs
> hibmc_crtc_helper_funcs = {
>         .atomic_flush   = hibmc_crtc_atomic_flush,
>         .atomic_enable  = hibmc_crtc_atomic_enable,
>         .atomic_disable = hibmc_crtc_atomic_disable,
> +       .mode_valid = hibmc_crtc_mode_valid,
>  };
>
>  int hibmc_de_init(struct hibmc_drm_private *priv)
> --
> 2.7.4
>
>
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