linux-kernel - Re: [PATCH v2 3/4] drm/mediatek: add the mipitx driving control

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Message-ID: <f8932588-eab8-4f08-c902-341fd83d7542@gmail.com>
Date:   Tue, 25 Feb 2020 20:09:31 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Jitao Shi <jitao.shi@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, srv_heupstream@...iatek.com,
        yingjoe.chen@...iatek.com, eddie.huang@...iatek.com,
        cawa.cheng@...iatek.com, bibby.hsieh@...iatek.com,
        ck.hu@...iatek.com, stonea168@....com, huijuan.xie@...iatek.com
Subject: Re: [PATCH v2 3/4] drm/mediatek: add the mipitx driving control



On 25/02/2020 12:47, Jitao Shi wrote:
> Add a property in device tree to control the driving by different
> board.
> 
> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>

Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

> ---
>  drivers/gpu/drm/mediatek/mtk_mipi_tx.c        | 6 ++++++
>  drivers/gpu/drm/mediatek/mtk_mipi_tx.h        | 1 +
>  drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c | 7 +++++++
>  3 files changed, 14 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_mipi_tx.c b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
> index e4d34484ecc8..ec8406c86bfb 100644
> --- a/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
> +++ b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
> @@ -125,6 +125,12 @@ static int mtk_mipi_tx_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> +	ret = of_property_read_u32(dev->of_node, "mipitx-current-drive",
> +				   &mipi_tx->mipitx_drive);
> +	/* If can't get the "mipi_tx->mipitx_drive", set it default 0x8 */
> +	if (ret < 0)
> +		mipi_tx->mipitx_drive = 0x8;
> +
>  	ref_clk_name = __clk_get_name(ref_clk);
>  
>  	ret = of_property_read_string(dev->of_node, "clock-output-names",
> diff --git a/drivers/gpu/drm/mediatek/mtk_mipi_tx.h b/drivers/gpu/drm/mediatek/mtk_mipi_tx.h
> index 413f35d86219..eea44327fe9f 100644
> --- a/drivers/gpu/drm/mediatek/mtk_mipi_tx.h
> +++ b/drivers/gpu/drm/mediatek/mtk_mipi_tx.h
> @@ -27,6 +27,7 @@ struct mtk_mipi_tx {
>  	struct device *dev;
>  	void __iomem *regs;
>  	u32 data_rate;
> +	u32 mipitx_drive;
>  	const struct mtk_mipitx_data *driver_data;
>  	struct clk_hw pll_hw;
>  	struct clk *pll;
> diff --git a/drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c b/drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c
> index 91f08a351fd0..124fdf95f1e5 100644
> --- a/drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c
> +++ b/drivers/gpu/drm/mediatek/mtk_mt8183_mipi_tx.c
> @@ -17,6 +17,9 @@
>  #define RG_DSI_BG_CORE_EN		BIT(7)
>  #define RG_DSI_PAD_TIEL_SEL		BIT(8)
>  
> +#define MIPITX_VOLTAGE_SEL	0x0010
> +#define RG_DSI_HSTX_LDO_REF_SEL		(0xf << 6)
> +
>  #define MIPITX_PLL_PWR		0x0028
>  #define MIPITX_PLL_CON0		0x002c
>  #define MIPITX_PLL_CON1		0x0030
> @@ -123,6 +126,10 @@ static void mtk_mipi_tx_power_on_signal(struct phy *phy)
>  	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_D3_SW_CTL_EN, DSI_SW_CTL_EN);
>  	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_CK_SW_CTL_EN, DSI_SW_CTL_EN);
>  
> +	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_VOLTAGE_SEL,
> +				RG_DSI_HSTX_LDO_REF_SEL,
> +				mipi_tx->mipitx_drive << 6);
> +
>  	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_CK_CKMODE_EN, DSI_CK_CKMODE_EN);
>  }
>  
>