linux-kernel - Re: [PATCH v8,2/3]drm: mediatek: Adjust the dpi output format to MT8186

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Message-ID: <ad7e399f-9fd9-371e-48d1-4f590b6e8a68@collabora.com>
Date:   Fri, 23 Sep 2022 11:16:34 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     xinlei.lee@...iatek.com, matthias.bgg@...il.com,
        jason-jh.lin@...iatek.com, rex-bc.chen@...iatek.com,
        ck.hu@...iatek.com, p.zabel@...gutronix.de, airlied@...ux.ie,
        daniel@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        jitao.shi@...iatek.com
Subject: Re: [PATCH v8,2/3]drm: mediatek: Adjust the dpi output format to
 MT8186

Il 22/09/22 14:45, xinlei.lee@...iatek.com ha scritto:
> From: Xinlei Lee <xinlei.lee@...iatek.com>
> 
> Due to the mt8186  hardware changes, we need to modify the dpi output
> format corresponding to the mmsys register(mmsys_base+0x400).
> 
> Because different sink ICs may support other output formats.
> The current DRM architecture supports retrieving the output format of
> all bridges (eg dpi is implemented via DRM's .atomic_check and
> .atomic_get_output_bus_fmts and .atomic_get_input_bus_fmts).
> If no unified output format is found, the default soc format
> (MEDIA_BUS_FMT_RGB888_2X12_LE in mt8186) is used.
> 
> Therefore, if there are other format sink ICs (RGB888_DDR/RGB888_SDR) in
> the future, the sink IC needs to add the func implementation mentioned
> above needs to be added.
> And the drm architecture will select the appropriate format to change
> the dpi output.
> 
> Co-developed-by: Jitao Shi <jitao.shi@...iatek.com>
> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> Signed-off-by: Xinlei Lee <xinlei.lee@...iatek.com>
> ---
>   drivers/gpu/drm/mediatek/mtk_dpi.c | 11 +++++++++++
>   1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 630a4e301ef6..bd1870a8504a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -15,6 +15,7 @@
>   #include <linux/of_graph.h>
>   #include <linux/pinctrl/consumer.h>
>   #include <linux/platform_device.h>
> +#include <linux/soc/mediatek/mtk-mmsys.h>
>   #include <linux/types.h>
>   
>   #include <video/videomode.h>
> @@ -30,6 +31,7 @@
>   #include "mtk_disp_drv.h"
>   #include "mtk_dpi_regs.h"
>   #include "mtk_drm_ddp_comp.h"
> +#include "mtk_drm_drv.h"
>   
>   enum mtk_dpi_out_bit_num {
>   	MTK_DPI_OUT_BIT_NUM_8BITS,
> @@ -82,6 +84,7 @@ struct mtk_dpi {
>   	struct pinctrl_state *pins_dpi;
>   	u32 output_fmt;
>   	int refcount;
> +	struct device *mmsys_dev;

Please place this after `struct device *dev;` and not here at the end.

Thanks,
Angelo