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SubjectRe: [v4 3/7] drm/mediatek: add dsi reg commit disable control
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Hi, Jitao:

On Sat, 2019-06-01 at 17:26 +0800, Jitao Shi wrote:
> New DSI IP has shadow register and working reg. The register
> values are writen to shadow register. And then trigger with
> commit reg, the register values will be moved working register.
>
> This fucntion is defualt on. But this driver doesn't use this
> function. So add the disable control.

Reviewed-by: CK Hu <ck.hu@mediatek.com>

>
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> ---
> drivers/gpu/drm/mediatek/mtk_dsi.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index a48db056df6c..eea47294079e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -131,6 +131,10 @@
> #define VM_CMD_EN BIT(0)
> #define TS_VFP_EN BIT(5)
>
> +#define DSI_SHADOW_DEBUG 0x190U
> +#define FORCE_COMMIT BIT(0)
> +#define BYPASS_SHADOW BIT(1)
> +
> #define CONFIG (0xff << 0)
> #define SHORT_PACKET 0
> #define LONG_PACKET 2
> @@ -157,6 +161,7 @@ struct phy;
>
> struct mtk_dsi_driver_data {
> const u32 reg_cmdq_off;
> + bool has_shadow_ctl;
> };
>
> struct mtk_dsi {
> @@ -594,6 +599,11 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
> }
>
> mtk_dsi_enable(dsi);
> +
> + if (dsi->driver_data->has_shadow_ctl)
> + writel(FORCE_COMMIT | BYPASS_SHADOW,
> + dsi->regs + DSI_SHADOW_DEBUG);
> +
> mtk_dsi_reset_engine(dsi);
> mtk_dsi_phy_timconfig(dsi);
>


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