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Date: Wed, 1 Dec 2021 19:07:15 -0600
From: Adam Ford <aford173@...il.com>
To: Tim Harvey <tharvey@...eworks.com>
Cc: Lucas Stach <l.stach@...gutronix.de>,
linux-media <linux-media@...r.kernel.org>,
Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
Hans Verkuil <hverkuil@...all.nl>,
Nicolas Dufresne <nicolas@...fresne.ca>,
Adam Ford-BE <aford@...conembedded.com>,
Rob Herring <robh+dt@...nel.org>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Device Tree Mailing List <devicetree@...r.kernel.org>,
Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
open list <linux-kernel@...r.kernel.org>,
"open list:HANTRO VPU CODEC DRIVER"
<linux-rockchip@...ts.infradead.org>,
"open list:STAGING SUBSYSTEM" <linux-staging@...ts.linux.dev>
Subject: Re: [RFC V2 0/2] arm64: imx8mm: Enable Hantro VPUs
On Wed, Dec 1, 2021 at 2:04 PM Tim Harvey <tharvey@...eworks.com> wrote:
>
> On Wed, Dec 1, 2021 at 10:37 AM Lucas Stach <l.stach@...gutronix.de> wrote:
> >
> > Am Mittwoch, dem 01.12.2021 um 10:16 -0800 schrieb Tim Harvey:
> > > On Wed, Dec 1, 2021 at 9:32 AM Lucas Stach <l.stach@...gutronix.de> wrote:
> > > >
> > > > Hi Tim,
> > > >
> > > > Am Mittwoch, dem 01.12.2021 um 09:23 -0800 schrieb Tim Harvey:
> > > > > On Tue, Nov 30, 2021 at 5:33 PM Adam Ford <aford173@...il.com> wrote:
> > > > > >
> > > > > > The i.MX8M has two Hantro video decoders, called G1 and G2 which appear
> > > > > > to be related to the video decoders used on the i.MX8MQ, but because of
> > > > > > how the Mini handles the power domains, the VPU driver does not need to
> > > > > > handle all the functions, nor does it support the post-processor,
> > > > > > so a new compatible flag is required.
> > > > > >
> > > > > > With the suggestion from Hans Verkuil, I was able to get the G2 splat to go away
> > > > > > with changes to FORCE_MAX_ZONEORDER, but I found I could also set cma=512M, however
> > > > > > it's unclear to me if that's an acceptable alternative.
> > > > > >
> > > > > > At the suggestion of Ezequiel Garcia and Nicolas Dufresne I have some
> > > > > > results from Fluster. However, the G2 VPU appears to fail most tests.
> > > > > >
> > > > > > ./fluster.py run -dGStreamer-H.264-V4L2SL-Gst1.0
> > > > > > Ran 90/135 tests successfully in 76.431 secs
> > > > > >
> > > > > > ./fluster.py run -d GStreamer-VP8-V4L2SL-Gst1.0
> > > > > > Ran 55/61 tests successfully in 21.454 secs
> > > > > >
> > > > > > ./fluster.py run -d GStreamer-VP9-V4L2SL-Gst1.0
> > > > > > Ran 0/303 tests successfully in 20.016 secs
> > > > > >
> > > > > > Each day seems to show more and more G2 submissions, and gstreamer seems to be
> > > > > > still working on the VP9, so I am not sure if I should drop G2 as well.
> > > > > >
> > > > > >
> > > > > > Adam Ford (2):
> > > > > > media: hantro: Add support for i.MX8M Mini
> > > > > > arm64: dts: imx8mm: Enable VPU-G1 and VPU-G2
> > > > > >
> > > > > > arch/arm64/boot/dts/freescale/imx8mm.dtsi | 41 +++++++++++++++
> > > > > > drivers/staging/media/hantro/hantro_drv.c | 2 +
> > > > > > drivers/staging/media/hantro/hantro_hw.h | 2 +
> > > > > > drivers/staging/media/hantro/imx8m_vpu_hw.c | 57 +++++++++++++++++++++
> > > > > > 4 files changed, 102 insertions(+)
> > > > > >
> > > > >
> > > > > Adam,
> > > > >
> > > > > That's for the patches!
> > > > >
> > > > > I tested just this series on top of v5.16-rc3 on an
> > > > > imx8mm-venice-gw73xx-0x and found that if I loop fluster I can end up
> > > > > getting a hang within 10 to 15 mins or so when imx8m_blk_ctrl_power_on
> > > > > is called for VPUMIX pd :
> > > > > while [ 1 ]; do uptime; ./fluster.py run -d GStreamer-VP8-V4L2SL-Gst1.0; done
> > > > > ...
> > > > > [ 618.838436] imx-pgc imx-pgc-domain.6: failed to command PGC
> > > > > [ 618.844407] imx8m-blk-ctrl 38330000.blk-ctrl: failed to power up bus domain
> > > > >
> > > > > I added prints in imx_pgc_power_{up,down} and
> > > > > imx8m_blk_ctrl_power_{on,off} to get some more context
> > > > > ...
> > > > > Ran 55/61 tests successfully in 8.685 secs
> > > > > 17:16:34 up 17 min, 0 users, load average: 3.97, 2.11, 0.93
> > > > > ********************************************************************************
> > > > > ********************
> > > > > Running test suite VP8-TEST-VECTORS with decoder GStreamer-VP8-V4L2SL-Gst1.0
> > > > > Using 4 parallel job(s)
> > > > > ********************************************************************************
> > > > > ********************
> > > > >
> > > > > [TEST SUITE ] (DECODER ) TEST VECTOR ... R
> > > > > ESULT
> > > > > ----------------------------------------------------------------------
> > > > > [ 1023.114806] imx8m_blk_ctrl_power_on vpublk-g1
> > > > > [ 1023.119669] imx_pgc_power_up vpumix
> > > > > [ 1023.124307] imx-pgc imx-pgc-domain.6: failed to command PGC
> > > > > [ 1023.130006] imx8m-blk-ctrl 38330000.blk-ctrl: failed to power up bus domain
> > > > >
> > > > > While this wouldn't be an issue with this series it does indicate we
> > > > > still have something racy in blk-ctrl. Can you reproduce this (and if
> > > > > not what kernel are you based on)? Perhaps you or Lucas have some
> > > > > ideas?
> > > > >
> > > > Did you have "[PATCH] soc: imx: gpcv2: Synchronously suspend MIX
> > > > domains" applied when running those tests? It has only recently been
> > > > picked up by Shawn and may have an influence on the bus domain
> > > > behavior.
> > > >
> > >
> > > Lucas,
> > >
> > > Good point. I did have that originally before I started pruning down
> > > to the bare minimum to reproduce the issue.
> > >
> > > I added it back and now I have the following:
> > > arm64: dts: imx8mm: Enable VPU-G1 and VPU-G2
> > > media: hantro: Add support for i.MX8M Mini
> > > soc: imx: gpcv2: keep i.MX8MM VPU-H1 bus clock active
> > > soc: imx: gpcv2: Synchronously suspend MIX domains
> > > Linux 5.16-rc3
> > >
> > > Here's the latest with that patch:
> > > ...
> > > [VP8-TEST-VECTORS] (GStreamer-VP8-V4L2SL-Gst1.0)
> > > vp80-00-comprehensive-007 ... Success
> > > [ 316.632373] imx8m_blk_ctrl_power_off vpublk-g1
> > > [ 316.636908] imx_pgc_power_down vpu-g1
> > > [ 316.640983] imx_pgc_power_down vpumix
> > > [ 316.756869] imx8m_blk_ctrl_power_on vpublk-g1
> > > [ 316.761360] imx_pgc_power_up vpumix
> > > [ 316.765985] imx-pgc imx-pgc-domain.6: failed to command PGC
> > > [ 316.772743] imx8m-blk-ctrl 38330000.blk-ctrl: failed to power up bus domain
> > > ^^^ hang
> >
> > Hm, I wonder if there's some broken error handling here somewhere, as a
> > failure to power up a domain shouldn't lead to a hang.
> >
> > However, that doesn't explain why the PGC isn't completing the request.
> > Can you try to extend the timeout some more. Even though I think that
> > 1msec should already be generous. Can you dump the content of the
> > GPC_PU_PGC_SW_PUP_REQ and GPC_A53_PU_PGC_PUP_STATUSn (all 3 of them)
> > registers, when the failure condition is hit?
> >
I haven't been able to repeat your findings on G1, but when testing
VP9 on the G2 decoder, I get the following:
[VP9-TEST-VECTORS] (GStreamer-VP9-V4L2SL-Gst1.0)
vp90-2-07-frame_parallel.webm ... Success
[VP9-TEST-VECTORS] (GStreamer-VP9-V4L2SL-Gst1.0)
vp90-2-07-frame_parallel-1.webm ... Success
[VP9-TEST-VECTORS] (GStreamer-VP9-V4L2SL-Gst1.0)
vp90-2-08-tile_1x4_frame_parallel.webm ... Timeout
[VP9-TEST-VECTORS] (GStreamer-VP9-V4L2SL-Gst1.0)
vp90-2-08-tile_1x2.webm ... Timeout
[VP9-TEST-VECTORS] (GStreamer-VP9-V4L2SL-Gst1.0)
vp90-2-02-size-lf-1920x1080.webm ... Timeout
[VP9-TEST-VECTORS] (GStreamer-VP9-V4L2SL-Gst1.0)
vp90-2-08-tile_1x2_frame_parallel.webm ... Timeout
[ 192.971101] cma: cma_alloc: reserved: alloc failed, req-size: 3548
pages, ret: -12
[ 192.979748] hantro-vpu 38310000.video-codec: dma alloc of size
14532608 failed
[ 192.988683] cma: cma_alloc: reserved: alloc failed, req-size: 938
pages, ret: -12
[VP9-TEST-VECTORS] (GStreamer-VP9-V4L2SL-Gst1.0)
vp90-2-08-tile_1x8.webm ... Error
[ 195.296712] imx-pgc imx-pgc-domain.6: failed to command PGC
[ 195.302396] imx8m-blk-ctrl 38330000.blk-ctrl: failed to power up bus domain
At some point the G2 times out, starts to choke on memory, then the
power domain fails, and then the system hangs. I have a heartbeat
GPIO running so I know if the kernel is alive or not. The heartbeat
stops, so I know it's locked up tightly.
I guess the good news is that the G2 decoder is able to run 100-ish
successful tests before it falls down.
Either way, I'll post a RFC V3 for the Hantro stuff, but I wonder if
the order of operations on the power-domain powerdown is an issue.
adam
>
> Adam,
>
> Adding keep_clocks=true to VPUG1/VPUG2 domains did not help
>
> Lucas,
>
> I bumped the regmap_read_poll_timeout timeouts from 1m to 100ms and
> still saw the same issue.
>
> Here's some added debugging to show the regs:
> [ 648.037903] imx8m_blk_ctrl_power_on vpublk-g1
> [ 648.042346] imx_pgc_power_up vpumix
> [ 648.146178] imx-pgc imx-pgc-domain.6: imx_pgc_power_up: failed to command PGC
> [ 648.153355] imx-pgc imx-pgc-domain.6: GPC_PU_PGC_SW_PUP_REQ(0x0f8)=0x00000100
> [ 648.162339] imx-pgc imx-pgc-domain.6:
> GPC_A53_PU_PGC_PUP_STATUS0(0x14c)=0x00000000
> [ 648.169988] imx-pgc imx-pgc-domain.6:
> GPC_A53_PU_PGC_PUP_STATUS1(0x150)=0x00000000
> [ 648.177618] imx-pgc imx-pgc-domain.6:
> GPC_A53_PU_PGC_PUP_STATUS2(0x154)=0x00000000
> [ 648.185281] imx8m-blk-ctrl 38330000.blk-ctrl: failed to power up bus domain
>
> diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
> index 8176380b02e6..8124a3434655 100644
> --- a/drivers/soc/imx/gpcv2.c
> +++ b/drivers/soc/imx/gpcv2.c
> @@ -67,6 +67,9 @@
>
> #define GPC_PU_PGC_SW_PUP_REQ 0x0f8
> #define GPC_PU_PGC_SW_PDN_REQ 0x104
> +#define GPC_A53_PU_PGC_PUP_STATUS0 0x14c
> +#define GPC_A53_PU_PGC_PUP_STATUS1 0x150
> +#define GPC_A53_PU_PGC_PUP_STATUS2 0x154
>
> #define IMX7_USB_HSIC_PHY_SW_Pxx_REQ BIT(4)
> #define IMX7_USB_OTG2_PHY_SW_Pxx_REQ BIT(3)
> @@ -224,6 +227,7 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd)
> u32 reg_val, pgc;
> int ret;
>
> +printk("%s %s\n", __func__, genpd->name);
> ret = pm_runtime_get_sync(domain->dev);
> if (ret < 0) {
> pm_runtime_put_noidle(domain->dev);
> @@ -258,9 +262,17 @@ static int imx_pgc_power_up(struct
> generic_pm_domain *genpd)
> ret = regmap_read_poll_timeout(domain->regmap,
> GPC_PU_PGC_SW_PUP_REQ, reg_val,
> !(reg_val & domain->bits.pxx),
> - 0, USEC_PER_MSEC);
> + 0, 100 * USEC_PER_MSEC);
> if (ret) {
> - dev_err(domain->dev, "failed to command PGC\n");
> + dev_err(domain->dev, "%s: failed to command
> PGC\n", __func__);
> + if (!regmap_read(domain->regmap,
> GPC_PU_PGC_SW_PUP_REQ, ®_val))
> + dev_err(domain->dev,
> "GPC_PU_PGC_SW_PUP_REQ(0x%03x)=0x%08x\n", GPC_PU_PGC_SW_PUP_REQ,
> reg_val);
> + if (!regmap_read(domain->regmap,
> GPC_A53_PU_PGC_PUP_STATUS0, ®_val))
> + dev_err(domain->dev,
> "GPC_A53_PU_PGC_PUP_STATUS0(0x%03x)=0x%08x\n",
> GPC_A53_PU_PGC_PUP_STATUS0, reg_val);
> + if (!regmap_read(domain->regmap,
> GPC_A53_PU_PGC_PUP_STATUS1, ®_val))
> + dev_err(domain->dev,
> "GPC_A53_PU_PGC_PUP_STATUS1(0x%03x)=0x%08x\n",
> GPC_A53_PU_PGC_PUP_STATUS1, reg_val);
> + if (!regmap_read(domain->regmap,
> GPC_A53_PU_PGC_PUP_STATUS2, ®_val))
> + dev_err(domain->dev,
> "GPC_A53_PU_PGC_PUP_STATUS2(0x%03x)=0x%08x\n",
> GPC_A53_PU_PGC_PUP_STATUS2, reg_val);
> goto out_clk_disable;
> }
>
> @@ -318,6 +330,7 @@ static int imx_pgc_power_down(struct
> generic_pm_domain *genpd)
> u32 reg_val, pgc;
> int ret;
>
> +printk("%s %s\n", __func__, genpd->name);
> /* Enable reset clocks for all devices in the domain */
> if (!domain->keep_clocks) {
> ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks);
> @@ -335,7 +348,7 @@ static int imx_pgc_power_down(struct
> generic_pm_domain *genpd)
> ret = regmap_read_poll_timeout(domain->regmap, GPC_PU_PWRHSK,
> reg_val,
> !(reg_val & domain->bits.hskack),
> - 0, USEC_PER_MSEC);
> + 0, 100 * USEC_PER_MSEC);
> if (ret) {
> dev_err(domain->dev, "failed to power down ADB400\n");
> goto out_clk_disable;
> @@ -359,9 +372,9 @@ static int imx_pgc_power_down(struct
> generic_pm_domain *genpd)
> ret = regmap_read_poll_timeout(domain->regmap,
> GPC_PU_PGC_SW_PDN_REQ, reg_val,
> !(reg_val & domain->bits.pxx),
> - 0, USEC_PER_MSEC);
> + 0, 100 * USEC_PER_MSEC);
> if (ret) {
> - dev_err(domain->dev, "failed to command PGC\n");
> + dev_err(domain->dev, "%s: failed to command
> PGC\n", __func__);
> goto out_clk_disable;
> }
> }
> @@ -712,6 +725,7 @@ static const struct imx_pgc_domain imx8mm_pgc_domains[] = {
> .map = IMX8MM_VPUG1_A53_DOMAIN,
> },
> .pgc = BIT(IMX8MM_PGC_VPUG1),
> + .keep_clocks = true,
> },
>
> [IMX8MM_POWER_DOMAIN_VPUG2] = {
> @@ -723,6 +737,7 @@ static const struct imx_pgc_domain imx8mm_pgc_domains[] = {
> .map = IMX8MM_VPUG2_A53_DOMAIN,
> },
> .pgc = BIT(IMX8MM_PGC_VPUG2),
> + .keep_clocks = true,
> },
>
> [IMX8MM_POWER_DOMAIN_VPUH1] = {
> diff --git a/drivers/soc/imx/imx8m-blk-ctrl.c b/drivers/soc/imx/imx8m-blk-ctrl.c
> index 519b3651d1d9..028f38d45892 100644
> --- a/drivers/soc/imx/imx8m-blk-ctrl.c
> +++ b/drivers/soc/imx/imx8m-blk-ctrl.c
> @@ -68,6 +68,7 @@ static int imx8m_blk_ctrl_power_on(struct
> generic_pm_domain *genpd)
> struct imx8m_blk_ctrl *bc = domain->bc;
> int ret;
>
> +printk("%s %s\n", __func__, genpd->name);
> /* make sure bus domain is awake */
> ret = pm_runtime_get_sync(bc->bus_power_dev);
> if (ret < 0) {
> @@ -119,6 +120,7 @@ static int imx8m_blk_ctrl_power_off(struct
> generic_pm_domain *genpd)
> const struct imx8m_blk_ctrl_domain_data *data = domain->data;
> struct imx8m_blk_ctrl *bc = domain->bc;
>
> +printk("%s %s\n", __func__, genpd->name);
> /* put devices into reset and disable clocks */
> regmap_clear_bits(bc->regmap, BLK_SFT_RSTN, data->rst_mask);
> regmap_clear_bits(bc->regmap, BLK_CLK_EN, data->clk_mask);
>
> Tim
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