From: Matthias Brugger <matthias.bgg@gmail.com>
To: Enric Balletbo i Serra <enric.balletbo@collabora.com>,
linux-kernel@vger.kernel.org
Cc: chunkuang.hu@kernel.org, hsinyi@chromium.org,
kernel@collabora.com, drinkcat@chromium.org, eizan@chromium.org,
linux-mediatek@lists.infradead.org, jitao.shi@mediatek.com,
Philipp Zabel <p.zabel@pengutronix.de>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 6/7] soc: mediatek: mmsys: Add reset controller support
Date: Fri, 6 Aug 2021 19:34:46 +0200 [thread overview]
Message-ID: <91bee4b6-2b43-e4ef-52ab-72e4e0b0c7b3@gmail.com> (raw)
In-Reply-To: <20210714121116.v2.6.I15e2419141a69b2e5c7e700c34d92a69df47e04d@changeid>
On 14/07/2021 12:11, Enric Balletbo i Serra wrote:
> Among other features the mmsys driver should implement a reset
> controller to be able to reset different bits from their space.
>
> Cc: Jitao Shi <jitao.shi@mediatek.com>
> Suggested-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
I'm happy to take this, as soon as we have the updated binding description.
Regards,
Matthias
> ---
>
> (no changes since v1)
>
> drivers/soc/mediatek/mtk-mmsys.c | 69 ++++++++++++++++++++++++++++++++
> drivers/soc/mediatek/mtk-mmsys.h | 2 +
> 2 files changed, 71 insertions(+)
>
> diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c
> index e681029fe804..6ac4deff0164 100644
> --- a/drivers/soc/mediatek/mtk-mmsys.c
> +++ b/drivers/soc/mediatek/mtk-mmsys.c
> @@ -4,10 +4,12 @@
> * Author: James Liao <jamesjj.liao@mediatek.com>
> */
>
> +#include <linux/delay.h>
> #include <linux/device.h>
> #include <linux/io.h>
> #include <linux/of_device.h>
> #include <linux/platform_device.h>
> +#include <linux/reset-controller.h>
> #include <linux/soc/mediatek/mtk-mmsys.h>
>
> #include "mtk-mmsys.h"
> @@ -55,6 +57,8 @@ static const struct mtk_mmsys_driver_data mt8183_mmsys_driver_data = {
> struct mtk_mmsys {
> void __iomem *regs;
> const struct mtk_mmsys_driver_data *data;
> + spinlock_t lock; /* protects mmsys_sw_rst_b reg */
> + struct reset_controller_dev rcdev;
> };
>
> void mtk_mmsys_ddp_connect(struct device *dev,
> @@ -91,6 +95,59 @@ void mtk_mmsys_ddp_disconnect(struct device *dev,
> }
> EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_disconnect);
>
> +static int mtk_mmsys_reset_update(struct reset_controller_dev *rcdev, unsigned long id,
> + bool assert)
> +{
> + struct mtk_mmsys *mmsys = container_of(rcdev, struct mtk_mmsys, rcdev);
> + unsigned long flags;
> + u32 reg;
> + int i;
> +
> + spin_lock_irqsave(&mmsys->lock, flags);
> +
> + reg = readl_relaxed(mmsys->regs + MMSYS_SW0_RST_B);
> +
> + if (assert)
> + reg &= ~BIT(id);
> + else
> + reg |= BIT(id);
> +
> + writel_relaxed(reg, mmsys->regs + MMSYS_SW0_RST_B);
> +
> + spin_unlock_irqrestore(&mmsys->lock, flags);
> +
> + return 0;
> +}
> +
> +static int mtk_mmsys_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
> +{
> + return mtk_mmsys_reset_update(rcdev, id, true);
> +}
> +
> +static int mtk_mmsys_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
> +{
> + return mtk_mmsys_reset_update(rcdev, id, false);
> +}
> +
> +static int mtk_mmsys_reset(struct reset_controller_dev *rcdev, unsigned long id)
> +{
> + int ret;
> +
> + ret = mtk_mmsys_reset_assert(rcdev, id);
> + if (ret)
> + return ret;
> +
> + usleep_range(1000, 1100);
> +
> + return mtk_mmsys_reset_deassert(rcdev, id);
> +}
> +
> +static const struct reset_control_ops mtk_mmsys_reset_ops = {
> + .assert = mtk_mmsys_reset_assert,
> + .deassert = mtk_mmsys_reset_deassert,
> + .reset = mtk_mmsys_reset,
> +};
> +
> static int mtk_mmsys_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -111,6 +168,18 @@ static int mtk_mmsys_probe(struct platform_device *pdev)
> return ret;
> }
>
> + spin_lock_init(&mmsys->lock);
> +
> + mmsys->rcdev.owner = THIS_MODULE;
> + mmsys->rcdev.nr_resets = 32;
> + mmsys->rcdev.ops = &mtk_mmsys_reset_ops;
> + mmsys->rcdev.of_node = pdev->dev.of_node;
> + ret = devm_reset_controller_register(&pdev->dev, &mmsys->rcdev);
> + if (ret) {
> + dev_err(&pdev->dev, "Couldn't register mmsys reset controller: %d\n", ret);
> + return ret;
> + }
> +
> mmsys->data = of_device_get_match_data(&pdev->dev);
> platform_set_drvdata(pdev, mmsys);
>
> diff --git a/drivers/soc/mediatek/mtk-mmsys.h b/drivers/soc/mediatek/mtk-mmsys.h
> index 11388961dded..f9f9e12ceab8 100644
> --- a/drivers/soc/mediatek/mtk-mmsys.h
> +++ b/drivers/soc/mediatek/mtk-mmsys.h
> @@ -66,6 +66,8 @@
> #define DPI_SEL_IN_BLS 0x0
> #define DSI_SEL_IN_RDMA 0x1
>
> +#define MMSYS_SW0_RST_B 0x140
> +
> struct mtk_mmsys_routes {
> u32 from_comp;
> u32 to_comp;
>
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next prev parent reply other threads:[~2021-08-06 17:36 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-14 10:11 [PATCH v2 0/7] Add support to the mmsys driver to be a reset controller Enric Balletbo i Serra
2021-07-14 10:11 ` [PATCH v2 1/7] arm64: dts: mediatek: Move reset controller constants into common location Enric Balletbo i Serra
2021-07-30 5:04 ` Guenter Roeck
2021-08-06 15:43 ` Matthias Brugger
2021-07-14 10:11 ` [PATCH v2 2/7] dt-bindings: mediatek: Add #reset-cells to mmsys system controller Enric Balletbo i Serra
2021-07-16 17:42 ` Rob Herring
2021-07-14 10:11 ` [PATCH v2 3/7] dt-bindings: display: mediatek: add dsi reset optional property Enric Balletbo i Serra
2021-07-16 17:55 ` Rob Herring
2021-07-14 10:11 ` [PATCH v2 4/7] arm64: dts: mt8173: Add the mmsys reset bit to reset the dsi0 Enric Balletbo i Serra
2021-07-16 17:56 ` Rob Herring
2021-07-14 10:11 ` [PATCH v2 5/7] arm64: dts: mt8183: " Enric Balletbo i Serra
2021-07-16 17:57 ` Rob Herring
2021-07-14 10:11 ` [PATCH v2 6/7] soc: mediatek: mmsys: Add reset controller support Enric Balletbo i Serra
2021-07-20 10:52 ` Philipp Zabel
2021-07-20 17:07 ` Enric Balletbo i Serra
2021-07-21 9:53 ` Philipp Zabel
2021-08-06 17:34 ` Matthias Brugger [this message]
2021-07-14 10:11 ` [PATCH v2 7/7] drm/mediatek: mtk_dsi: Reset the dsi0 hardware Enric Balletbo i Serra
2021-08-02 23:21 ` Chun-Kuang Hu
2021-08-06 17:33 ` Matthias Brugger
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