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Message-ID: <997da91ccc893a53cf4e7713ba08b5e32043c507.camel@mediatek.com>
Date: Fri, 27 May 2022 17:30:40 +0800
From: CK Hu <ck.hu@...iatek.com>
To: Moudy Ho <moudy.ho@...iatek.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Hans Verkuil <hverkuil-cisco@...all.nl>
CC: Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Rob Landley <rob@...dley.net>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
<linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>,
Alexandre Courbot <acourbot@...omium.org>,
<tfiga@...omium.org>, <drinkcat@...omium.org>,
<pihsun@...omium.org>, <hsinyi@...gle.com>,
Benjamin Gaignard <benjamin.gaignard@...labora.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
daoyuan huang <daoyuan.huang@...iatek.com>,
Ping-Hsun Wu <ping-hsun.wu@...iatek.com>,
<allen-kh.cheng@...iatek.com>, <xiandong.wang@...iatek.com>,
<randy.wu@...iatek.com>, <jason-jh.lin@...iatek.com>,
<roy-cw.yeh@...iatek.com>, <river.cheng@...iatek.com>,
<Project_Global_Chrome_Upstream_Group@...iatek.com>,
<cellopoint.kai@...il.com>
Subject: Re: [PATCH v18 6/6] soc: mediatek: mutex: add functions that
operate registers by CMDQ
Hi, Moudy:
On Thu, 2022-05-12 at 16:41 +0800, Moudy Ho wrote:
> Due to HW limitations, MDP3 is necessary to enable MUTEX in each
> frame
> for SOF triggering and cooperate with CMDQ control to reduce the
> amount
> of interrupts generated(also, reduce frame latency).
>
> In response to the above situation, a new interface
> "mtk_mutex_enable_by_cmdq" has been added to achieve the purpose.
>
> Signed-off-by: Moudy Ho <moudy.ho@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> ---
> drivers/soc/mediatek/mtk-mutex.c | 47
> +++++++++++++++++++++++++-
> include/linux/soc/mediatek/mtk-mutex.h | 2 ++
> 2 files changed, 48 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/soc/mediatek/mtk-mutex.c
> b/drivers/soc/mediatek/mtk-mutex.c
> index 92afdee14d43..4ec2954f2f43 100644
> --- a/drivers/soc/mediatek/mtk-mutex.c
> +++ b/drivers/soc/mediatek/mtk-mutex.c
> @@ -7,10 +7,12 @@
> #include <linux/iopoll.h>
> #include <linux/module.h>
> #include <linux/of_device.h>
> +#include <linux/of_address.h>
> #include <linux/platform_device.h>
> #include <linux/regmap.h>
> #include <linux/soc/mediatek/mtk-mmsys.h>
> #include <linux/soc/mediatek/mtk-mutex.h>
> +#include <linux/soc/mediatek/mtk-cmdq.h>
>
> #define MT2701_MUTEX0_MOD0 0x2c
> #define MT2701_MUTEX0_SOF0 0x30
> @@ -176,6 +178,9 @@ struct mtk_mutex_ctx {
> void __iomem *regs;
> struct mtk_mutex mutex[10];
> const struct mtk_mutex_data *data;
> + phys_addr_t addr;
> + struct cmdq_client_reg cmdq_reg;
> + bool has_gce_client_reg;
I think this is not necessary. If cmdq_reg.size == 0, that would imply
cmdq_reg is invalid.
> };
>
> static const unsigned int mt2701_mutex_mod[DDP_COMPONENT_ID_MAX] = {
> @@ -531,6 +536,30 @@ void mtk_mutex_enable(struct mtk_mutex *mutex)
> }
> EXPORT_SYMBOL_GPL(mtk_mutex_enable);
>
> +int mtk_mutex_enable_by_cmdq(struct mtk_mutex *mutex, void *pkt)
> +{
> + struct mtk_mutex_ctx *mtx = container_of(mutex, struct
> mtk_mutex_ctx,
> + mutex[mutex->id]);
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> + struct cmdq_pkt *cmdq_pkt = (struct cmdq_pkt *)pkt;
> +
> + WARN_ON(&mtx->mutex[mutex->id] != mutex);
> +
> + if (!mtx->has_gce_client_reg) {
> + dev_err(mtx->dev, "mediatek,gce-client-reg hasn't been
> set in dts");
> + return -EINVAL;
> + }
> +
> + cmdq_pkt_write(cmdq_pkt, mtx->cmdq_reg.subsys,
> + mtx->addr + DISP_REG_MUTEX_EN(mutex->id), 1);
> + return 0;
> +#else
> + dev_err(mtx->dev, "Not support for enable MUTEX by CMDQ");
> + return -ENODEV;
> +#endif
> +}
> +EXPORT_SYMBOL_GPL(mtk_mutex_enable_by_cmdq);
> +
> void mtk_mutex_disable(struct mtk_mutex *mutex)
> {
> struct mtk_mutex_ctx *mtx = container_of(mutex, struct
> mtk_mutex_ctx,
> @@ -655,8 +684,11 @@ static int mtk_mutex_probe(struct
> platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct mtk_mutex_ctx *mtx;
> - struct resource *regs;
> + struct resource *regs, addr;
> int i;
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> + int ret;
> +#endif
>
> mtx = devm_kzalloc(dev, sizeof(*mtx), GFP_KERNEL);
> if (!mtx)
> @@ -676,6 +708,19 @@ static int mtk_mutex_probe(struct
> platform_device *pdev)
> }
> }
>
> + if (of_address_to_resource(dev->of_node, 0, &addr) < 0)
> + mtx->addr = 0L;
You may return error, or you should check mtx->addr when use it.
Regards,
CK
> + else
> + mtx->addr = addr.start;
> +
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> + ret = cmdq_dev_get_client_reg(dev, &mtx->cmdq_reg, 0);
> + if (ret)
> + dev_dbg(dev, "No mediatek,gce-client-reg!\n");
> + else
> + mtx->has_gce_client_reg = true;
> +#endif
> +
> regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> mtx->regs = devm_ioremap_resource(dev, regs);
> if (IS_ERR(mtx->regs)) {
> diff --git a/include/linux/soc/mediatek/mtk-mutex.h
> b/include/linux/soc/mediatek/mtk-mutex.h
> index f174452212d6..80425ae19fb7 100644
> --- a/include/linux/soc/mediatek/mtk-mutex.h
> +++ b/include/linux/soc/mediatek/mtk-mutex.h
> @@ -29,6 +29,8 @@ int mtk_mutex_prepare(struct mtk_mutex *mutex);
> void mtk_mutex_add_comp(struct mtk_mutex *mutex,
> enum mtk_ddp_comp_id id);
> void mtk_mutex_enable(struct mtk_mutex *mutex);
> +int mtk_mutex_enable_by_cmdq(struct mtk_mutex *mutex,
> + void *pkt);
> void mtk_mutex_disable(struct mtk_mutex *mutex);
> void mtk_mutex_remove_comp(struct mtk_mutex *mutex,
> enum mtk_ddp_comp_id id);
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