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Message-ID: <529b61b1b1e6030c92a7944c4864246521b2ccdd.camel@pengutronix.de>
Date: Fri, 16 Apr 2021 17:14:18 +0200
From: Lucas Stach <l.stach@...gutronix.de>
To: Benjamin Gaignard <benjamin.gaignard@...labora.com>,
ezequiel@...labora.com, p.zabel@...gutronix.de, mchehab@...nel.org,
robh+dt@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
festevam@...il.com, lee.jones@...aro.org,
gregkh@...uxfoundation.org, mripard@...nel.org,
paul.kocialkowski@...tlin.com, wens@...e.org,
jernej.skrabec@...l.net, hverkuil-cisco@...all.nl,
emil.l.velikov@...il.com, "Peng Fan (OSS)" <peng.fan@....nxp.com>,
Jacky Bai <ping.bai@....com>
Cc: devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-rockchip@...ts.infradead.org, linux-imx@....com,
kernel@...gutronix.de, kernel@...labora.com, cphealy@...il.com,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v9 03/13] media: hantro: Use syscon instead of 'ctrl'
register
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@...labora.com>
> > > Reviewed-by: Philipp Zabel <p.zabel@...gutronix.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)
> > > };
> >
> >
>
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