[PATCH] video: drm: exynos: mie bypass enable for fimd

[Inki Dae]

Hi,

DISP1BLK_CFG register is related to GScaler, HDCP and MIXER as well. So
it's not good that this register is controlled in fimd module. And I think
the function to control the register should be placed in SoC common file .
In other words, other drivers should be able to control the register
through common thing also.

Thanks,
Inki Dae

2012/12/26 Leela Krishna Amudala <l.krishna at samsung.com>

> Bypasses the mie for fimd by parsing the register and bit offset values
> from "mie-bypass" node, if "mie-bypass" node is present in the dts file.
>
> Signed-off-by: Leela Krishna Amudala <l.krishna at samsung.com>
> ---
>  drivers/gpu/drm/exynos/exynos_drm_fimd.c | 55
> ++++++++++++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> index bf0d9ba..f8ad259 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> @@ -118,6 +118,12 @@ static const struct of_device_id
> fimd_driver_dt_match[] = {
>  MODULE_DEVICE_TABLE(of, fimd_driver_dt_match);
>  #endif
>
> +struct mie_bypass {
> +       u32                             enable_bypass;
> +       void __iomem                    *bypass_reg;
> +       u32                             bypass_bit_offset;
> +};
> +
>  static inline struct fimd_driver_data *drm_fimd_get_driver_data(
>         struct platform_device *pdev)
>  {
> @@ -133,6 +139,41 @@ static inline struct fimd_driver_data
> *drm_fimd_get_driver_data(
>                 platform_get_device_id(pdev)->driver_data;
>  }
>
> +static struct mie_bypass *parse_mie_bypass_for_fimd(struct device *dev,
> +                                       struct device_node
> *mie_bypass_node)
> +{
> +       struct mie_bypass *bypass_data;
> +       u32 phy_address;
> +
> +       bypass_data = devm_kzalloc(dev, sizeof(*bypass_data), GFP_KERNEL);
> +       if (!bypass_data) {
> +               dev_err(dev, "memory allocation for bypass data failed\n");
> +               return ERR_PTR(-ENOMEM);
> +       }
> +       of_property_read_u32(mie_bypass_node, "samsung,mie-bypass-enable",
> +                       &bypass_data->enable_bypass);
> +       of_property_read_u32(mie_bypass_node, "samsung,disp1blk-cfg-reg",
> +                       &phy_address);
> +       of_property_read_u32(mie_bypass_node, "samsung,bypass-bit-offset",
> +                       &bypass_data->bypass_bit_offset);
> +
> +       bypass_data->bypass_reg = ioremap(phy_address, SZ_4);
>
+       if (!bypass_data->bypass_reg) {
> +               dev_err(dev, "failed to ioremap phy_address\n");
> +               return ERR_PTR(-ENOMEM);
> +       }
> +       return bypass_data;
> +}
>
+
> +static void mie_bypass_for_fimd(struct mie_bypass *bypass_data)
> +{
> +       u32 reg;
> +
> +       reg = __raw_readl(bypass_data->bypass_reg);
> +       reg |= (1 << bypass_data->bypass_bit_offset);
> +       __raw_writel(reg, bypass_data->bypass_reg);
> +}
> +
>  static bool fimd_display_is_connected(struct device *dev)
>  {
>         DRM_DEBUG_KMS("%s\n", __FILE__);
> @@ -906,12 +947,26 @@ static int __devinit fimd_probe(struct
> platform_device *pdev)
>         struct exynos_drm_fimd_pdata *pdata;
>         struct exynos_drm_panel_info *panel;
>         struct resource *res;
> +       struct device_node *mie_bypass_node;
> +       struct mie_bypass *bypass_data = NULL;
>         int win;
>         int ret = -EINVAL;
>
>         DRM_DEBUG_KMS("%s\n", __FILE__);
>
>         pdata = pdev->dev.platform_data;
> +       if (pdev->dev.of_node) {
> +               mie_bypass_node = of_find_node_by_name(pdev->dev.of_node,
> +                                                       "mie-bypass");
> +               if (mie_bypass_node) {
> +                       bypass_data = parse_mie_bypass_for_fimd(&pdev->dev,
> +                                                       mie_bypass_node);
>
+                       if (IS_ERR(bypass_data))
> +                               return PTR_ERR(bypass_data);
> +                       if (bypass_data->enable_bypass)
> +                               mie_bypass_for_fimd(bypass_data);
> +               }
> +       }
>         if (!pdata) {
>                 dev_err(dev, "no platform data specified\n");
>                 return -EINVAL;
> --
> 1.8.0
>
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