Re: [PATCH v16 3/8] drm/mediatek: Add MT8195 Embedded DisplayPort driver

CK Hu
2022-08-08T05:51:11Z

Hi, Bo-Chen:

On Fri, 2022-08-05 at 18:14 +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>
> Tested-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@collabora.com>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@collabora.com>
> ---

[snip]

> +#define MTK_DP_ENC0_P0_3038 (ENC0_OFFSET + 0x38)
> +#define VIDEO_SOURCE_SEL_DP_ENC0_P0_MASK BIT(11)
> +#define VIDEO_SOURCE_SEL_DP_ENC0_P0_SHIFT (BIT(0) | BIT(1) |
> BIT(3))

It's not necessary to define a symbol for shift because it's trivial
that we understand it's a shift.

> +
> +#define MTK_DP_ENC0_P0_303C (ENC0_OFFSET + 0x3C)
> +#define SRAM_START_READ_THRD_DP_ENC0_P0_MASK GENMASK(5, 0)
> +#define SRAM_START_READ_THRD_DP_ENC0_P0_SHIFT 0

Ditto.

> +#define VIDEO_COLOR_DEPTH_DP_ENC0_P0_MASK GENMASK(10, 8)
> +#define VIDEO_COLOR_DEPTH_DP_ENC0_P0_SHIFT BIT(3)

Ditto.

Regards,
CK

> +
>