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Date: Wed, 26 May 2021 08:41:33 +0300
From: Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
To: Yong Wu <yong.wu@...iatek.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Joerg Roedel <joro@...tes.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>
Cc: Evan Green <evgreen@...omium.org>,
Robin Murphy <robin.murphy@....com>,
Tomasz Figa <tfiga@...omium.org>,
Will Deacon <will.deacon@....com>,
linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
iommu@...ts.linux-foundation.org, youlin.pei@...iatek.com,
Nicolas Boichat <drinkcat@...omium.org>,
Matthias Kaehlcke <mka@...omium.org>, anan.sun@...iatek.com,
chao.hao@...iatek.com, ming-fan.chen@...iatek.com,
yi.kuo@...iatek.com, eizan@...omium.org, acourbot@...omium.org,
CK Hu <ck.hu@...iatek.com>,
Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH v5 11/16] drm/mediatek: Get rid of mtk_smi_larb_get/put
Hi
On 10.04.21 12:11, Yong Wu wrote:
> MediaTek IOMMU has already added the device_link between the consumer
> and smi-larb device. If the drm device call the pm_runtime_get_sync,
> the smi-larb's pm_runtime_get_sync also be called automatically.
>
> CC: CK Hu <ck.hu@...iatek.com>
> CC: Philipp Zabel <p.zabel@...gutronix.de>
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> Reviewed-by: Evan Green <evgreen@...omium.org>
> Acked-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 9 ------
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 35 ---------------------
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 1 -
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 5 +--
> 4 files changed, 1 insertion(+), 49 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 971ef58ac1dc..d59353af4019 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -10,7 +10,6 @@
> #include <linux/soc/mediatek/mtk-mutex.h>
>
> #include <asm/barrier.h>
> -#include <soc/mediatek/smi.h>
>
> #include <drm/drm_atomic.h>
> #include <drm/drm_atomic_helper.h>
> @@ -544,12 +543,6 @@ static void mtk_drm_crtc_atomic_enable(struct drm_crtc *crtc,
>
> DRM_DEBUG_DRIVER("%s %d\n", __func__, crtc->base.id);
>
> - ret = mtk_smi_larb_get(comp->larb_dev);
> - if (ret) {
> - DRM_ERROR("Failed to get larb: %d\n", ret);
> - return;
> - }
> -
> ret = pm_runtime_resume_and_get(comp->dev);
> if (ret < 0)
> DRM_DEV_ERROR(comp->dev, "Failed to enable power domain: %d\n",
> @@ -557,7 +550,6 @@ static void mtk_drm_crtc_atomic_enable(struct drm_crtc *crtc,
>
> ret = mtk_crtc_ddp_hw_init(mtk_crtc);
> if (ret) {
> - mtk_smi_larb_put(comp->larb_dev);
> pm_runtime_put(comp->dev);
> return;
> }
> @@ -594,7 +586,6 @@ static void mtk_drm_crtc_atomic_disable(struct drm_crtc *crtc,
>
> drm_crtc_vblank_off(crtc);
> mtk_crtc_ddp_hw_fini(mtk_crtc);
> - mtk_smi_larb_put(comp->larb_dev);
> ret = pm_runtime_put(comp->dev);
> if (ret < 0)
> DRM_DEV_ERROR(comp->dev, "Failed to disable power domain: %d\n",
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 75bc00e17fc4..6c01492ba4df 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -449,37 +449,12 @@ unsigned int mtk_drm_find_possible_crtc_by_comp(struct drm_device *drm,
> return ret;
> }
>
> -static int mtk_ddp_get_larb_dev(struct device_node *node, struct mtk_ddp_comp *comp,
> - struct device *dev)
> -{
> - struct device_node *larb_node;
> - struct platform_device *larb_pdev;
> -
> - larb_node = of_parse_phandle(node, "mediatek,larb", 0);
> - if (!larb_node) {
> - dev_err(dev, "Missing mediadek,larb phandle in %pOF node\n", node);
> - return -EINVAL;
> - }
> -
> - larb_pdev = of_find_device_by_node(larb_node);
> - if (!larb_pdev) {
> - dev_warn(dev, "Waiting for larb device %pOF\n", larb_node);
> - of_node_put(larb_node);
> - return -EPROBE_DEFER;
> - }
> - of_node_put(larb_node);
> - comp->larb_dev = &larb_pdev->dev;
> -
> - return 0;
> -}
> -
> int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp,
> enum mtk_ddp_comp_id comp_id)
> {
> struct platform_device *comp_pdev;
> enum mtk_ddp_comp_type type;
> struct mtk_ddp_comp_dev *priv;
> - int ret;
Hi,
This 'ret' is also used inside `if IS_REACHABLE(CONFIG_MTK_CMDQ)`
so it should not be removed.
Thanks,
Dafna
>
> if (comp_id < 0 || comp_id >= DDP_COMPONENT_ID_MAX)
> return -EINVAL;
> @@ -495,16 +470,6 @@ int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp,
> }
> comp->dev = &comp_pdev->dev;
>
> - /* Only DMA capable components need the LARB property */
> - if (type == MTK_DISP_OVL ||
> - type == MTK_DISP_OVL_2L ||
> - type == MTK_DISP_RDMA ||
> - type == MTK_DISP_WDMA) {
> - ret = mtk_ddp_get_larb_dev(node, comp, comp->dev);
> - if (ret)
> - return ret;
> - }
> -
> if (type == MTK_DISP_BLS ||
> type == MTK_DISP_CCORR ||
> type == MTK_DISP_COLOR ||
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index bb914d976cf5..1b582262b682 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -70,7 +70,6 @@ struct mtk_ddp_comp_funcs {
> struct mtk_ddp_comp {
> struct device *dev;
> int irq;
> - struct device *larb_dev;
> enum mtk_ddp_comp_id id;
> const struct mtk_ddp_comp_funcs *funcs;
> };
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index b013d56d2777..622de47239eb 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -576,11 +576,8 @@ static int mtk_drm_probe(struct platform_device *pdev)
> pm_runtime_disable(dev);
> err_node:
> of_node_put(private->mutex_node);
> - for (i = 0; i < DDP_COMPONENT_ID_MAX; i++) {
> + for (i = 0; i < DDP_COMPONENT_ID_MAX; i++)
> of_node_put(private->comp_node[i]);
> - if (private->ddp_comp[i].larb_dev)
> - put_device(private->ddp_comp[i].larb_dev);
> - }
> return ret;
> }
>
>
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