linux-kernel - Re: [PATCH 3/3] drm/mediatek: dsi: Add dsi cmdq

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Message-ID: <a89a22d786fbb7a2176b1eb4823ebbdd163cfb09.camel@mediatek.com>
Date:   Fri, 16 Jun 2023 06:50:06 +0000
From:   Shuijing Li (李水静) 
        <Shuijing.Li@...iatek.com>
To:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        Jitao Shi (石记涛) <jitao.shi@...iatek.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        Xinlei Lee (李昕磊) 
        <Xinlei.Lee@...iatek.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "airlied@...ux.ie" <airlied@...ux.ie>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH 3/3] drm/mediatek: dsi: Add dsi cmdq_ctl to send panel
 initial code

Hi Matthias,

I will update v2 version as your suggestion.

BRs,
Shuijing

On Thu, 2023-04-13 at 11:09 +0200, Matthias Brugger wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> On 13/04/2023 08:09, xinlei.lee@...iatek.com wrote:
> > From: Xinlei Lee <xinlei.lee@...iatek.com>
> > 
> > For mt8188, add dsi cmdq reg control to send long packets to panel
> > initialization.
> > 
> > Signed-off-by: Xinlei Lee <xinlei.lee@...iatek.com>
> > Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> > ---
> >   drivers/gpu/drm/mediatek/mtk_dsi.c | 12 ++++++++++++
> >   1 file changed, 12 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > index 500a3054282d..cbfe5df4647c 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > @@ -86,6 +86,7 @@
> > 
> >   #define DSI_CMDQ_SIZE               0x60
> >   #define CMDQ_SIZE                   0x3f
> > +#define CMDQ_SIZE_SEL                        BIT(15)
> > 
> >   #define DSI_HSTX_CKL_WC             0x64
> > 
> > @@ -178,6 +179,7 @@ struct mtk_dsi_driver_data {
> >       const u32 reg_cmdq_off;
> >       bool has_shadow_ctl;
> >       bool has_size_ctl;
> > +     bool cmdq_long_packet_ctl;
> >   };
> > 
> >   struct mtk_dsi {
> > @@ -965,6 +967,11 @@ static u32 mtk_dsi_recv_cnt(u8 type, u8
> > *read_data)
> >       return 0;
> >   }
> > 
> > +static void mtk_dsi_cmd_packet_ctl(struct mtk_dsi *dsi)
> > +{
> > +     mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE_SEL,
> > CMDQ_SIZE_SEL);
> > +}
> > +
> >   static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct
> > mipi_dsi_msg *msg)
> >   {
> >       const char *tx_buf = msg->tx_buf;
> > @@ -996,6 +1003,8 @@ static void mtk_dsi_cmdq(struct mtk_dsi *dsi,
> > const struct mipi_dsi_msg *msg)
> > 
> >       mtk_dsi_mask(dsi, reg_cmdq_off, cmdq_mask, reg_val);
> >       mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE, cmdq_size);
> > +     if (dsi->driver_data->cmdq_long_packet_ctl)
> > +             mtk_dsi_cmd_packet_ctl(dsi);
> 
> Why don't you put the onliner
> mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE_SEL, CMDQ_SIZE_SEL);
> directly here. Please help me understand why adding another
> indirection is
> usefull here.
> 
> Best regards,
> Matthias
> 
> >   }
> > 
> >   static ssize_t mtk_dsi_host_send_cmd(struct mtk_dsi *dsi,
> > @@ -1200,18 +1209,21 @@ static const struct mtk_dsi_driver_data
> > mt8183_dsi_driver_data = {
> >       .reg_cmdq_off = 0x200,
> >       .has_shadow_ctl = true,
> >       .has_size_ctl = true,
> > +     .cmdq_long_packet_ctl = false,
> >   };
> > 
> >   static const struct mtk_dsi_driver_data mt8186_dsi_driver_data =
> > {
> >       .reg_cmdq_off = 0xd00,
> >       .has_shadow_ctl = true,
> >       .has_size_ctl = true,
> > +     .cmdq_long_packet_ctl = false,
> >   };
> > 
> >   static const struct mtk_dsi_driver_data mt8188_dsi_driver_data =
> > {
> >       .reg_cmdq_off = 0xd00,
> >       .has_shadow_ctl = true,
> >       .has_size_ctl = true,
> > +     .cmdq_long_packet_ctl = true,
> >   };
> > 
> >   static const struct of_device_id mtk_dsi_of_match[] = {