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Message-ID: <529b61b1b1e6030c92a7944c4864246521b2ccdd.camel@pengutronix.de>
Subject: Re: [PATCH v9 03/13] media: hantro: Use syscon instead of 'ctrl'
 register
From:   Lucas Stach <l.stach@pengutronix.de>
To:     Benjamin Gaignard <benjamin.gaignard@collabora.com>,
        ezequiel@collabora.com, p.zabel@pengutronix.de, mchehab@kernel.org,
        robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de,
        festevam@gmail.com, lee.jones@linaro.org,
        gregkh@linuxfoundation.org, mripard@kernel.org,
        paul.kocialkowski@bootlin.com, wens@csie.org,
        jernej.skrabec@siol.net, hverkuil-cisco@xs4all.nl,
        emil.l.velikov@gmail.com, "Peng Fan (OSS)" <peng.fan@oss.nxp.com>,
        Jacky Bai <ping.bai@nxp.com>
Cc:     devel@driverdev.osuosl.org, devicetree@vger.kernel.org,
        linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-rockchip@lists.infradead.org, linux-imx@nxp.com,
        kernel@pengutronix.de, kernel@collabora.com, cphealy@gmail.com,
        linux-arm-kernel@lists.infradead.org
Date:   Fri, 16 Apr 2021 17:14:18 +0200
In-Reply-To: <ffe9b3f5-94f5-453e-73f0-4b42d0454b63@collabora.com>
References: <20210407073534.376722-1-benjamin.gaignard@collabora.com>
         <20210407073534.376722-4-benjamin.gaignard@collabora.com>
         <7bcbb787d82f21d42563d8fb7e3c2e7d40123932.camel@pengutronix.de>
         <ffe9b3f5-94f5-453e-73f0-4b42d0454b63@collabora.com>
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Am Freitag, dem 16.04.2021 um 15:08 +0200 schrieb Benjamin Gaignard:
> Le 16/04/2021 à 12:54, Lucas Stach a écrit :
> > Am Mittwoch, dem 07.04.2021 um 09:35 +0200 schrieb Benjamin Gaignard:
> > > In order to be able to share the control hardware block between
> > > VPUs use a syscon instead a ioremap it in the driver.
> > > To keep the compatibility with older DT if 'nxp,imx8mq-vpu-ctrl'
> > > phandle is not found look at 'ctrl' reg-name.
> > > With the method it becomes useless to provide a list of register
> > > names so remove it.
> > Sorry for putting a spoke in the wheel after many iterations of the
> > series.
> > 
> > We just discussed a way forward on how to handle the clocks and resets
> > provided by the blkctl block on i.MX8MM and later and it seems there is
> > a consensus on trying to provide virtual power domains from a blkctl
> > driver, controlling clocks and resets for the devices in the power
> > domain. I would like to avoid introducing yet another way of handling
> > the blkctl and thus would like to align the i.MX8MQ VPU blkctl with
> > what we are planning to do on the later chip generations.
> > 
> > CC'ing Jacky Bai and Peng Fan from NXP, as they were going to give this
> > virtual power domain thing a shot.
> 
> That could replace the 3 first patches and Dt patche of this series
> but that will not impact the hevc part, so I wonder if pure hevc patches
> could be merged anyway ?
> They are reviewed and don't depend of how the ctrl block is managed.

I'm not really in a position to give any informed opinion about that
hvec patches, as I only skimmed them, but I don't see any reason to
delay patches 04-11 from this series until the i.MX8M platform issues
are sorted. AFAICS those things are totally orthogonal.

Regards,
Lucas

> > 
> > Regards,
> > Lucas
> > 
> > > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> > > Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
> > > ---
> > > version 9:
> > >   - Corrections in commit message
> > > 
> > > version 7:
> > >   - Add Philipp reviewed-by tag.
> > >   - Change syscon phandle name.
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > version 5:
> > >   - use syscon instead of VPU reset driver.
> > >   - if DT doesn't provide syscon keep backward compatibilty by using
> > >     'ctrl' reg-name.
> > > 
> > >   drivers/staging/media/hantro/hantro.h       |  5 +-
> > >   drivers/staging/media/hantro/imx8m_vpu_hw.c | 52 ++++++++++++---------
> > >   2 files changed, 34 insertions(+), 23 deletions(-)
> > > 
> > > diff --git a/drivers/staging/media/hantro/hantro.h b/drivers/staging/media/hantro/hantro.h
> > > index 6c1b888abe75..37b9ce04bd4e 100644
> > > --- a/drivers/staging/media/hantro/hantro.h
> > > +++ b/drivers/staging/media/hantro/hantro.h
> > > @@ -13,6 +13,7 @@
> > >   #define HANTRO_H_
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   #include <linux/platform_device.h>
> > > +#include <linux/regmap.h>
> > >   #include <linux/videodev2.h>
> > >   #include <linux/wait.h>
> > >   #include <linux/clk.h>
> > > @@ -167,7 +168,7 @@ hantro_vdev_to_func(struct video_device *vdev)
> > >    * @reg_bases:		Mapped addresses of VPU registers.
> > >    * @enc_base:		Mapped address of VPU encoder register for convenience.
> > >    * @dec_base:		Mapped address of VPU decoder register for convenience.
> > > - * @ctrl_base:		Mapped address of VPU control block.
> > > + * @ctrl_base:		Regmap of VPU control block.
> > >    * @vpu_mutex:		Mutex to synchronize V4L2 calls.
> > >    * @irqlock:		Spinlock to synchronize access to data structures
> > >    *			shared with interrupt handlers.
> > > @@ -186,7 +187,7 @@ struct hantro_dev {
> > >   	void __iomem **reg_bases;
> > >   	void __iomem *enc_base;
> > >   	void __iomem *dec_base;
> > > -	void __iomem *ctrl_base;
> > > +	struct regmap *ctrl_base;
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   	struct mutex vpu_mutex;	/* video_device lock */
> > >   	spinlock_t irqlock;
> > > diff --git a/drivers/staging/media/hantro/imx8m_vpu_hw.c b/drivers/staging/media/hantro/imx8m_vpu_hw.c
> > > index c222de075ef4..8d0c3425234b 100644
> > > --- a/drivers/staging/media/hantro/imx8m_vpu_hw.c
> > > +++ b/drivers/staging/media/hantro/imx8m_vpu_hw.c
> > > @@ -7,6 +7,7 @@
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   #include <linux/clk.h>
> > >   #include <linux/delay.h>
> > > +#include <linux/mfd/syscon.h>
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   #include "hantro.h"
> > >   #include "hantro_jpeg.h"
> > > @@ -24,30 +25,28 @@
> > >   #define CTRL_G1_PP_FUSE		0x0c
> > >   #define CTRL_G2_DEC_FUSE	0x10
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > +static const struct regmap_config ctrl_regmap_ctrl = {
> > > +	.reg_bits = 32,
> > > +	.val_bits = 32,
> > > +	.reg_stride = 0x14,
> > > +};
> > > +
> > >   static void imx8m_soft_reset(struct hantro_dev *vpu, u32 reset_bits)
> > >   {
> > > -	u32 val;
> > > -
> > >   	/* Assert */
> > > -	val = readl(vpu->ctrl_base + CTRL_SOFT_RESET);
> > > -	val &= ~reset_bits;
> > > -	writel(val, vpu->ctrl_base + CTRL_SOFT_RESET);
> > > +	regmap_update_bits(vpu->ctrl_base, CTRL_SOFT_RESET, reset_bits, 0);
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   	udelay(2);
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   	/* Release */
> > > -	val = readl(vpu->ctrl_base + CTRL_SOFT_RESET);
> > > -	val |= reset_bits;
> > > -	writel(val, vpu->ctrl_base + CTRL_SOFT_RESET);
> > > +	regmap_update_bits(vpu->ctrl_base, CTRL_SOFT_RESET,
> > > +			   reset_bits, reset_bits);
> > >   }
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   static void imx8m_clk_enable(struct hantro_dev *vpu, u32 clock_bits)
> > >   {
> > > -	u32 val;
> > > -
> > > -	val = readl(vpu->ctrl_base + CTRL_CLOCK_ENABLE);
> > > -	val |= clock_bits;
> > > -	writel(val, vpu->ctrl_base + CTRL_CLOCK_ENABLE);
> > > +	regmap_update_bits(vpu->ctrl_base, CTRL_CLOCK_ENABLE,
> > > +			   clock_bits, clock_bits);
> > >   }
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   static int imx8mq_runtime_resume(struct hantro_dev *vpu)
> > > @@ -64,9 +63,9 @@ static int imx8mq_runtime_resume(struct hantro_dev *vpu)
> > >   	imx8m_clk_enable(vpu, CLOCK_G1 | CLOCK_G2);
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   	/* Set values of the fuse registers */
> > > -	writel(0xffffffff, vpu->ctrl_base + CTRL_G1_DEC_FUSE);
> > > -	writel(0xffffffff, vpu->ctrl_base + CTRL_G1_PP_FUSE);
> > > -	writel(0xffffffff, vpu->ctrl_base + CTRL_G2_DEC_FUSE);
> > > +	regmap_write(vpu->ctrl_base, CTRL_G1_DEC_FUSE, 0xffffffff);
> > > +	regmap_write(vpu->ctrl_base, CTRL_G1_PP_FUSE, 0xffffffff);
> > > +	regmap_write(vpu->ctrl_base, CTRL_G2_DEC_FUSE, 0xffffffff);
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   	clk_bulk_disable_unprepare(vpu->variant->num_clocks, vpu->clocks);
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > @@ -150,8 +149,22 @@ static irqreturn_t imx8m_vpu_g1_irq(int irq, void *dev_id)
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   static int imx8mq_vpu_hw_init(struct hantro_dev *vpu)
> > >   {
> > > -	vpu->dec_base = vpu->reg_bases[0];
> > > -	vpu->ctrl_base = vpu->reg_bases[vpu->variant->num_regs - 1];
> > > +	struct device_node *np = vpu->dev->of_node;
> > > +
> > > +	vpu->ctrl_base = syscon_regmap_lookup_by_phandle(np, "nxp,imx8m-vpu-ctrl");
> > > +	if (IS_ERR(vpu->ctrl_base)) {
> > > +		struct resource *res;
> > > +		void __iomem *ctrl;
> > > +
> > > +		res = platform_get_resource_byname(vpu->pdev, IORESOURCE_MEM, "ctrl");
> > > +		ctrl = devm_ioremap_resource(vpu->dev, res);
> > > +		if (IS_ERR(ctrl))
> > > +			return PTR_ERR(ctrl);
> > > +
> > > +		vpu->ctrl_base = devm_regmap_init_mmio(vpu->dev, ctrl, &ctrl_regmap_ctrl);
> > > +		if (IS_ERR(vpu->ctrl_base))
> > > +			return PTR_ERR(vpu->ctrl_base);
> > > +	}
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   	return 0;
> > >   }
> > > @@ -198,7 +211,6 @@ static const struct hantro_irq imx8mq_irqs[] = {
> > >   };
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   static const char * const imx8mq_clk_names[] = { "g1", "g2", "bus" };
> > > -static const char * const imx8mq_reg_names[] = { "g1", "g2", "ctrl" };
> > >   
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > >   const struct hantro_variant imx8mq_vpu_variant = {
> > >   	.dec_fmts = imx8m_vpu_dec_fmts,
> > > @@ -215,6 +227,4 @@ const struct hantro_variant imx8mq_vpu_variant = {
> > >   	.num_irqs = ARRAY_SIZE(imx8mq_irqs),
> > >   	.clk_names = imx8mq_clk_names,
> > >   	.num_clocks = ARRAY_SIZE(imx8mq_clk_names),
> > > -	.reg_names = imx8mq_reg_names,
> > > -	.num_regs = ARRAY_SIZE(imx8mq_reg_names)
> > >   };
> > 
> > 
>