Re: [PATCH v14 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort driver

CK Hu
2022-07-13T09:12:49Z

Hi, Bo-Chen:

On Tue, 2022-07-12 at 19:12 +0800, Bo-Chen Chen wrote:
> From: Markus Schneider-Pargmann <msp@baylibre.com>
>
> This patch adds a embedded displayport driver for the MediaTek mt8195
> SoC.
>
> It supports the MT8195, the embedded DisplayPort units. It offers
> DisplayPort 1.4 with up to 4 lanes.
>
> The driver creates a child device for the phy. The child device will
> never exist without the parent being active. As they are sharing a
> register range, the parent passes a regmap pointer to the child so
> that
> both can work with the same register range. The phy driver sets
> device
> data that is read by the parent to get the phy device that can be
> used
> to control the phy properties.
>
> This driver is based on an initial version by
> Jitao shi <jitao.shi@mediatek.com>
>
> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
> Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
> ---

[snip]

> +
> +static void mtk_dp_msa_bypass_enable(struct mtk_dp *mtk_dp, bool
> enable)
> +{
> + u32 mask = BIT(HTOTAL_SEL_DP_ENC0_P0_SHIFT) |
> + BIT(VTOTAL_SEL_DP_ENC0_P0_SHIFT) |
> + BIT(HSTART_SEL_DP_ENC0_P0_SHIFT) |
> + BIT(VSTART_SEL_DP_ENC0_P0_SHIFT) |
> + BIT(HWIDTH_SEL_DP_ENC0_P0_SHIFT) |
> + BIT(VHEIGHT_SEL_DP_ENC0_P0_SHIFT) |
> + BIT(HSP_SEL_DP_ENC0_P0_SHIFT) |
> + BIT(HSW_SEL_DP_ENC0_P0_SHIFT) |
> + BIT(VSP_SEL_DP_ENC0_P0_SHIFT) |
> + BIT(VSW_SEL_DP_ENC0_P0_SHIFT);

I would like define a symbol like this

#define HTOTAL_SEL_DP_ENC0_P0 BIT(0)
#define VTOTAL_SEL_DP_ENC0_P0 BIT(1)
#define HSTART_SEL_DP_ENC0_P0 BIT(2)

Regards,
CK

> + u32 val = enable ? 0 : mask;
> +
> + mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3030, val, mask);
> +}
> +