From: CK Hu <ck.hu@mediatek.com>
To: Stu Hsieh <stu.hsieh@mediatek.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>,
David Airlie <airlied@linux.ie>,
Matthias Brugger <matthias.bgg@gmail.com>,
<dri-devel@lists.freedesktop.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-mediatek@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <srv_heupstream@mediatek.com>
Subject: Re: [PATCH v1 1/1] drm/mediatek: add function to match the connector and crtc
Date: Wed, 19 Sep 2018 19:56:35 +0800 [thread overview]
Message-ID: <1537358195.5124.6.camel@mtksdaap41> (raw)
In-Reply-To: <1536732170-30046-2-git-send-email-stu.hsieh@mediatek.com>
Hi, Stu:
On Wed, 2018-09-12 at 14:02 +0800, Stu Hsieh wrote:
> This patch add function to match the connector and crtc
>
> Because the connector set the possible_crtc to match the crtc.
>
> This function would search the connector in every ddp path and
> return the corresponding value for possible_crtc.
>
> Change-Id: Id51de53b95039f8174462d483eb9bfee31b3b93b
> Signed-off-by: Stu Hsieh <stu.hsieh@mediatek.com>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 41 +++++++++++++++++++++++++++++
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 2 ++
> 2 files changed, 43 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index ff974d82a4a6..1f734b806a00 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -245,6 +245,22 @@ static const struct mtk_ddp_comp_match mtk_ddp_matches[DDP_COMPONENT_ID_MAX] = {
> [DDP_COMPONENT_WDMA1] = { MTK_DISP_WDMA, 1, NULL },
> };
>
> +static bool mtk_drm_find_comp_in_ddp(struct mtk_ddp_comp ddp_comp,
> + const enum mtk_ddp_comp_id *path,
> + unsigned int path_len)
> +{
> + int i;
> +
> + if (!path)
> + return false;
> +
> + for (i = 0; i < path_len; i++)
> + if (ddp_comp.id == path[i])
> + return true;
> +
> + return false;
> +}
> +
> int mtk_ddp_comp_get_id(struct device_node *node,
> enum mtk_ddp_comp_type comp_type)
> {
> @@ -260,6 +276,31 @@ int mtk_ddp_comp_get_id(struct device_node *node,
> return -EINVAL;
> }
>
> +unsigned int mtk_drm_find_possible_crtc_by_comp(struct drm_device *drm,
> + struct mtk_ddp_comp ddp_comp)
> +{
> + struct mtk_drm_private *private = drm->dev_private;
> + unsigned int ret;
> +
> + if (mtk_drm_find_comp_in_ddp(ddp_comp, private->data->main_path,
> + private->data->main_len) == true) {
> + ret = BIT(0);
> + } else if (mtk_drm_find_comp_in_ddp(ddp_comp,
> + private->data->ext_path,
> + private->data->ext_len) == true) {
> + ret = BIT(1);
> + } else if (mtk_drm_find_comp_in_ddp(ddp_comp,
> + private->data->third_path,
> + private->data->third_len) == true) {
> + ret = BIT(2);
> + } else {
> + DRM_INFO("Failed to find comp in ddp table\n");
> + ret = 0;
> + }
The variable naming is very important. If one day there are fourth path,
fifth path, and sixth path, you would find everywhere where are such 'if
else'. So I would like you to change main_path, ext_path, third_path to
an array such as path[]. So this patch would be only a simple for-loop
and when you add more path, you need not to modify this function.
And would you also send the patch that include the caller call
mtk_drm_find_possible_crtc_by_comp(), so I could understand how do you
pass the parameter.
Regards,
CK
> +
> + return ret;
> +}
> +
> int mtk_ddp_comp_init(struct device *dev, struct device_node *node,
> struct mtk_ddp_comp *comp, enum mtk_ddp_comp_id comp_id,
> const struct mtk_ddp_comp_funcs *funcs)
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index 8399229e6ad2..f882e69088b8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -166,6 +166,8 @@ static inline void mtk_ddp_gamma_set(struct mtk_ddp_comp *comp,
> comp->funcs->gamma_set(comp, state);
> }
>
> +unsigned int mtk_drm_find_possible_crtc_by_comp(struct drm_device *drm,
> + struct mtk_ddp_comp ddp_comp);
> int mtk_ddp_comp_get_id(struct device_node *node,
> enum mtk_ddp_comp_type comp_type);
> int mtk_ddp_comp_init(struct device *dev, struct device_node *comp_node,
prev parent reply other threads:[~2018-09-19 11:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-12 6:02 [PATCH v1 0/1] Add function to set the possible crtc for connector Stu Hsieh
2018-09-12 6:02 ` [PATCH v1 1/1] drm/mediatek: add function to match the connector and crtc Stu Hsieh
2018-09-19 11:56 ` CK Hu [this message]
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