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Subject: Re: [PATCH 3/3] drm/mediatek: add mt8183 dsi driver support
To:     Jitao Shi <jitao.shi@mediatek.com>,
        Rob Herring <robh+dt@kernel.org>,
        Pawel Moll <pawel.moll@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>, linux-pwm@vger.kernel.org,
        David Airlie <airlied@linux.ie>, drinkcat@chromium.org
Cc:     Thierry Reding <treding@nvidia.com>,
        Ajay Kumar <ajaykumar.rs@samsung.com>,
        Inki Dae <inki.dae@samsung.com>,
        Rahul Sharma <rahul.sharma@samsung.com>,
        Sean Paul <seanpaul@chromium.org>,
        Vincent Palatin <vpalatin@chromium.org>,
        Andy Yan <andy.yan@rock-chips.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Russell King <rmk+kernel@arm.linux.org.uk>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com,
        Sascha Hauer <kernel@pengutronix.de>,
        yingjoe.chen@mediatek.com, eddie.huang@mediatek.com,
        cawa.cheng@mediatek.com, bibby.hsieh@mediatek.com,
        ck.hu@mediatek.com, stonea168@163.com
References: <20190214044243.129920-1-jitao.shi@mediatek.com>
 <20190214044243.129920-3-jitao.shi@mediatek.com>
From:   Matthias Brugger <matthias.bgg@gmail.com>
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Message-ID: <9e37106d-5e29-fc4a-56e1-5b551f47d723@gmail.com>
Date:   Thu, 14 Feb 2019 10:54:15 +0100
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On 14/02/2019 05:42, Jitao Shi wrote:
> MT8183 dsi has two changes with mt8173.
> 1. Add the register double buffer control, but we no need it, So make
>    it default off.
> 2. Add picture size control.
> 
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 80db02a25cb0..20cb53f05d42 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -78,6 +78,7 @@
>  #define DSI_VBP_NL		0x24
>  #define DSI_VFP_NL		0x28
>  #define DSI_VACT_NL		0x2C
> +#define DSI_SIZE_CON		0x38
>  #define DSI_HSA_WC		0x50
>  #define DSI_HBP_WC		0x54
>  #define DSI_HFP_WC		0x58
> @@ -131,7 +132,10 @@
>  #define VM_CMD_EN			BIT(0)
>  #define TS_VFP_EN			BIT(5)
>  
> -#define DSI_CMDQ0		0x180
> +#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
> @@ -158,6 +162,7 @@ struct phy;
>  
>  struct mtk_dsi_driver_data {
>  	const u32 reg_cmdq_off;
> +	bool has_size_ctl;
>  };
>  
>  struct mtk_dsi {
> @@ -426,6 +431,9 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
>  	writel(vm->vfront_porch, dsi->regs + DSI_VFP_NL);
>  	writel(vm->vactive, dsi->regs + DSI_VACT_NL);
>  
> +	if (dsi->driver_data->has_size_ctl)
> +		writel(vm->vactive << 16 | vm->hactive, dsi->regs + DSI_SIZE_CON);
> +
>  	horizontal_sync_active_byte = (vm->hsync_len * dsi_tmp_buf_bpp - 10);
>  
>  	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
> @@ -595,6 +603,9 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
>  	}
>  
>  	mtk_dsi_enable(dsi);
> +
> +	/* DSI no need this double buffer, disable it when writing register */
> +	writel(FORCE_COMMIT | BYPASS_SHADOW, dsi->regs + DSI_SHADOW_DEBUG);

Is this a mt8183 thing? Did you assure that this does not introduce regressions
on other SoCs, or does it fix any?

I think this should be a independent patch. If it fixes an actual issue, then
please provide a fixes tag in that patch.

Thanks,
Matthias

>  	mtk_dsi_reset_engine(dsi);
>  	mtk_dsi_phy_timconfig(dsi);
>  
> @@ -1090,11 +1101,18 @@ static const struct mtk_dsi_driver_data mt2701_dsi_driver_data = {
>  	.reg_cmdq_off = 0x180,
>  };
>  
> +static const struct mtk_dsi_driver_data mt8183_dsi_driver_data = {
> +	.reg_cmdq_off = 0x200,
> +	.has_size_ctl = true,
> +};
> +
>  static const struct of_device_id mtk_dsi_of_match[] = {
>  	{ .compatible = "mediatek,mt2701-dsi",
>  	  .data = &mt2701_dsi_driver_data },
>  	{ .compatible = "mediatek,mt8173-dsi",
>  	  .data = &mt8173_dsi_driver_data },
> +	{ .compatible = "mediatek,mt8183-dsi",
> +	  .data = &mt8183_dsi_driver_data },
>  	{ },
>  };
>  
>