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Message-ID: <aSErtOOG5X5JG8Kl@sultan-box>
Date: Fri, 21 Nov 2025 19:19:16 -0800
From: Sultan Alsawaf <sultan@...neltoast.com>
To: "Du, Bin" <bin.du@....com>
Cc: mchehab@...nel.org, hverkuil@...all.nl,
laurent.pinchart+renesas@...asonboard.com,
bryan.odonoghue@...aro.org, sakari.ailus@...ux.intel.com,
prabhakar.mahadev-lad.rj@...renesas.com,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
pratap.nirujogi@....com, benjamin.chan@....com, king.li@....com,
gjorgji.rosikopulos@....com, Phil.Jawich@....com,
Dominic.Antony@....com, mario.limonciello@....com,
richard.gong@....com, anson.tsao@....com
Subject: Re: [PATCH v5 0/7] Add AMD ISP4 driver
On Fri, Nov 21, 2025 at 06:55:10PM -0800, Sultan Alsawaf wrote:
> On Fri, Nov 21, 2025 at 12:20:36AM -0800, Sultan Alsawaf wrote:
> > On Wed, Nov 19, 2025 at 06:14:17PM +0800, Du, Bin wrote:
> > >
> > >
> > > On 11/18/2025 3:35 PM, Sultan Alsawaf wrote:
> > > > On Wed, Nov 12, 2025 at 06:21:33PM +0800, Du, Bin wrote:
> > > > >
> > > > >
> > > > > On 11/12/2025 3:38 PM, Sultan Alsawaf wrote:
> > > > > > On Tue, Nov 11, 2025 at 11:06:41PM -0800, Sultan Alsawaf wrote:
> > > > > > > On Wed, Nov 12, 2025 at 02:32:51PM +0800, Du, Bin wrote:
> > > > > > > > Thanks Sultan for your information.
> > > > > > > >
> > > > > > > > On 11/12/2025 9:21 AM, Sultan Alsawaf wrote:
> > > > > > > > > On Tue, Nov 11, 2025 at 03:33:42PM -0800, Sultan Alsawaf wrote:
> > > > > > > > > > On Tue, Nov 11, 2025 at 05:58:10PM +0800, Du, Bin wrote:
> > > > > > > > > > >
> > > > > > > > > > > On 11/11/2025 5:05 PM, Sultan Alsawaf wrote:
> > > > > > > > > > >
> > > > > > > > > > > > On Mon, Nov 10, 2025 at 05:46:28PM +0800, Du, Bin wrote:
> > > > > > > > > > > > > Thank you, Sultan, for your time, big effort, and constant support.
> > > > > > > > > > > > > Apologies for my delayed reply for being occupied a little with other
> > > > > > > > > > > > > matters.
> > > > > > > > > > > > >
> > > > > > > > > > > > > On 11/10/2025 4:33 PM, Sultan Alsawaf wrote:
> > > > > > > > > > > > > > Hi Bin,
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > On Wed, Nov 05, 2025 at 01:25:58AM -0800, Sultan Alsawaf wrote:
> > > > > > > > > > > > > > > Hi Bin,
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > To expedite review, I've attached a patch containing a bunch of fixes I've made
> > > > > > > > > > > > > > > on top of v5. Most of my changes should be self-explanatory; feel free to ask
> > > > > > > > > > > > > > > further about specific changes if you have any questions.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > I haven't had a chance to review all of the v4 -> v5 changes yet, but I figured
> > > > > > > > > > > > > > > I should send what I've got so far.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > FYI, there is a regression in isp4if_dequeue_buffer() where the bufq lock isn't
> > > > > > > > > > > > > > > protecting the list_del() anymore. I also checked the compiler output when using
> > > > > > > > > > > > > > > guard() versus scoped_guard() in that function and there is no difference:
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > sha1sum:
> > > > > > > > > > > > > > > 5652a0306da22ea741d80a9e03a787d0f71758a8 isp4_interface.o // guard()
> > > > > > > > > > > > > > > 5652a0306da22ea741d80a9e03a787d0f71758a8 isp4_interface.o // scoped_guard()
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > So guard() should be used there again, which I've done in my patch.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > I also have a few questions:
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > 1. Does ISP FW provide a register interface to disable the IRQ? If so, it is
> > > > > > > > > > > > > > > faster to use that than using disable_irq_nosync() to disable the IRQ from
> > > > > > > > > > > > > > > the CPU's side.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > 2. When the IRQ is re-enabled in isp4sd_fw_resp_func(), is there anything
> > > > > > > > > > > > > > > beforehand to mask all pending interrupts from the ISP so that there isn't a
> > > > > > > > > > > > > > > bunch of stale interrupts firing as soon the IRQ is re-enabled?
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > 3. Is there any risk of deadlock due to the stream kthread racing with the ISP
> > > > > > > > > > > > > > > when the ISP posts a new response _after_ the kthread determines there are no
> > > > > > > > > > > > > > > more new responses but _before_ the enable_irq() in isp4sd_fw_resp_func()?
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > 4. Why are some lines much longer than before? It seems inconsistent that now
> > > > > > > > > > > > > > > there is a mix of several lines wrapped to 80 cols and many lines going
> > > > > > > > > > > > > > > beyond 80 cols. And there are multiple places where code is wrapped before
> > > > > > > > > > > > > > > reaching 80 cols even with lots of room left, specifically for cases where it
> > > > > > > > > > > > > > > wouldn't hurt readability to put more characters onto each line.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > I've attached a new, complete patch of changes to apply on top of v5. You may
> > > > > > > > > > > > > > ignore the incomplete patch from my previous email and use the new one instead.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > I made many changes and also answered questions 1-3 myself.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Please apply this on top of v5 and let me know if you have any questions.
> > > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > Sure, will review, apply and test your patch accordingly. Your contribution
> > > > > > > > > > > > > is greatly appreciated, will let you know if there is any question or
> > > > > > > > > > > > > problem.
> > > > > > > > > > > > >
> > > > > > > > > > > > > > BTW, I noticed a strange regression in v5 even without any of my changes: every
> > > > > > > > > > > > > > time you use cheese after using it one time, the video will freeze after 30-60
> > > > > > > > > > > > > > seconds with this message printed to dmesg:
> > > > > > > > > > > > > > [ 2032.716559] amd_isp_capture amd_isp_capture: -><- fail respid unknown respid(0x30002)
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > And the video never unfreezes. I haven't found the cause for the regression yet;
> > > > > > > > > > > > > > can you try to reproduce it?
> > > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > Really weird, we don't see this issue either in dev or QA test. Is it 100%
> > > > > > > > > > > > > reproducible and any other fail or err in the log?
> > > > > > > > > > > >
> > > > > > > > > > > > Yes, it's 100% reproducible. There's no other message in dmesg, only that one.
> > > > > > > > > > > >
> > > > > > > > > > > > Sometimes there is a stop stream error when I close cheese after it froze:
> > > > > > > > > > > >
> > > > > > > > > > > > [ 656.540307] amd_isp_capture amd_isp_capture: fail to disable stream
> > > > > > > > > > > > [ 657.046633] amd_isp_capture amd_isp_capture: fail to stop steam
> > > > > > > > > > > > [ 657.047224] amd_isp_capture amd_isp_capture: disabling streaming failed (-110)
> > > > > > > > > > > >
> > > > > > > > > > > > When I revert to v4 I cannot reproduce it at all. It seems to be something in
> > > > > > > > > > > > v4 -> v5 that is not fixed by any of my changes.
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > Hi Sultan, could you please try following modifications on top of v5 to see
> > > > > > > > > > > if it helps?
> > > > > > > > > > >
> > > > > > > > > > > diff --git a/drivers/media/platform/amd/isp4/isp4_fw_cmd_resp.h
> > > > > > > > > > > b/drivers/media/platform/amd/isp4/isp4_fw_cmd_resp.h
> > > > > > > > > > > index 39c2265121f9..d571b3873edb 100644
> > > > > > > > > > > --- a/drivers/media/platform/amd/isp4/isp4_fw_cmd_resp.h
> > > > > > > > > > > +++ b/drivers/media/platform/amd/isp4/isp4_fw_cmd_resp.h
> > > > > > > > > > > @@ -97,7 +97,7 @@
> > > > > > > > > > >
> > > > > > > > > > > #define ADDR_SPACE_TYPE_GPU_VA 4
> > > > > > > > > > >
> > > > > > > > > > > -#define FW_MEMORY_POOL_SIZE (200 * 1024 * 1024)
> > > > > > > > > > > +#define FW_MEMORY_POOL_SIZE (100 * 1024 * 1024)
> > > > > > > > > > >
> > > > > > > > > > > /*
> > > > > > > > > > > * standard ISP mipicsi=>isp
> > > > > > > > > > > diff --git a/drivers/media/platform/amd/isp4/isp4_subdev.c
> > > > > > > > > > > b/drivers/media/platform/amd/isp4/isp4_subdev.c
> > > > > > > > > > > index 248d10076ae8..acbc80aa709e 100644
> > > > > > > > > > > --- a/drivers/media/platform/amd/isp4/isp4_subdev.c
> > > > > > > > > > > +++ b/drivers/media/platform/amd/isp4/isp4_subdev.c
> > > > > > > > > > > @@ -697,7 +697,7 @@ static int isp4sd_stop_resp_proc_threads(struct
> > > > > > > > > > > isp4_subdev *isp_subdev)
> > > > > > > > > > > return 0;
> > > > > > > > > > > }
> > > > > > > > > > >
> > > > > > > > > > > -static int isp4sd_pwroff_and_deinit(struct isp4_subdev *isp_subdev)
> > > > > > > > > > > +static int isp4sd_pwroff_and_deinit(struct isp4_subdev *isp_subdev, bool
> > > > > > > > > > > irq_enabled)
> > > > > > > > > > > {
> > > > > > > > > > > struct isp4sd_sensor_info *sensor_info = &isp_subdev->sensor_info;
> > > > > > > > > > > unsigned int perf_state = ISP4SD_PERFORMANCE_STATE_LOW;
> > > > > > > > > > > @@ -716,8 +716,9 @@ static int isp4sd_pwroff_and_deinit(struct isp4_subdev
> > > > > > > > > > > *isp_subdev)
> > > > > > > > > > > return 0;
> > > > > > > > > > > }
> > > > > > > > > > >
> > > > > > > > > > > - for (int i = 0; i < ISP4SD_MAX_FW_RESP_STREAM_NUM; i++)
> > > > > > > > > > > - disable_irq(isp_subdev->irq[i]);
> > > > > > > > > > > + if (irq_enabled)
> > > > > > > > > > > + for (int i = 0; i < ISP4SD_MAX_FW_RESP_STREAM_NUM; i++)
> > > > > > > > > > > + disable_irq(isp_subdev->irq[i]);
> > > > > > > > > > >
> > > > > > > > > > > isp4sd_stop_resp_proc_threads(isp_subdev);
> > > > > > > > > > > dev_dbg(dev, "isp_subdev stop resp proc streads suc");
> > > > > > > > > > > @@ -813,7 +814,7 @@ static int isp4sd_pwron_and_init(struct isp4_subdev
> > > > > > > > > > > *isp_subdev)
> > > > > > > > > > >
> > > > > > > > > > > return 0;
> > > > > > > > > > > err_unlock_and_close:
> > > > > > > > > > > - isp4sd_pwroff_and_deinit(isp_subdev);
> > > > > > > > > > > + isp4sd_pwroff_and_deinit(isp_subdev, false);
> > > > > > > > > > > return -EINVAL;
> > > > > > > > > > > }
> > > > > > > > > > >
> > > > > > > > > > > @@ -985,7 +986,7 @@ static int isp4sd_set_power(struct v4l2_subdev *sd, int
> > > > > > > > > > > on)
> > > > > > > > > > > if (on)
> > > > > > > > > > > return isp4sd_pwron_and_init(isp_subdev);
> > > > > > > > > > > else
> > > > > > > > > > > - return isp4sd_pwroff_and_deinit(isp_subdev);
> > > > > > > > > > > + return isp4sd_pwroff_and_deinit(isp_subdev, true);
> > > > > > > > > > > }
> > > > > > > > > > >
> > > > > > > > > > > static const struct v4l2_subdev_core_ops isp4sd_core_ops = {
> > > > > > > > > >
> > > > > > > > > > No difference sadly; same symptoms as before. FYI, your email client broke the
> > > > > > > > > > patch formatting so I couldn't apply it; it hard wrapped some lines to 80 cols,
> > > > > > > > > > replaced tabs with spaces, and removed leading spaces on each context line, so I
> > > > > > > > > > had to apply it manually. To confirm I applied it correctly, here is my diff:
> > > > > > > > > >
> > > > > > > > > > diff --git a/drivers/media/platform/amd/isp4/isp4_fw_cmd_resp.h b/drivers/media/platform/amd/isp4/isp4_fw_cmd_resp.h
> > > > > > > > > > index 39c2265121f9..d571b3873edb 100644
> > > > > > > > > > --- a/drivers/media/platform/amd/isp4/isp4_fw_cmd_resp.h
> > > > > > > > > > +++ b/drivers/media/platform/amd/isp4/isp4_fw_cmd_resp.h
> > > > > > > > > > @@ -97,7 +97,7 @@
> > > > > > > > > > #define ADDR_SPACE_TYPE_GPU_VA 4
> > > > > > > > > > -#define FW_MEMORY_POOL_SIZE (200 * 1024 * 1024)
> > > > > > > > > > +#define FW_MEMORY_POOL_SIZE (100 * 1024 * 1024)
> > > > > > > > > > /*
> > > > > > > > > > * standard ISP mipicsi=>isp
> > > > > > > > > > diff --git a/drivers/media/platform/amd/isp4/isp4_subdev.c b/drivers/media/platform/amd/isp4/isp4_subdev.c
> > > > > > > > > > index 4bd2ebf0f694..500ef0af8a41 100644
> > > > > > > > > > --- a/drivers/media/platform/amd/isp4/isp4_subdev.c
> > > > > > > > > > +++ b/drivers/media/platform/amd/isp4/isp4_subdev.c
> > > > > > > > > > @@ -669,7 +669,7 @@ static int isp4sd_stop_resp_proc_threads(struct isp4_subdev *isp_subdev)
> > > > > > > > > > return 0;
> > > > > > > > > > }
> > > > > > > > > > -static int isp4sd_pwroff_and_deinit(struct isp4_subdev *isp_subdev)
> > > > > > > > > > +static int isp4sd_pwroff_and_deinit(struct isp4_subdev *isp_subdev, bool irq_enabled)
> > > > > > > > > > {
> > > > > > > > > > struct isp4sd_sensor_info *sensor_info = &isp_subdev->sensor_info;
> > > > > > > > > > unsigned int perf_state = ISP4SD_PERFORMANCE_STATE_LOW;
> > > > > > > > > > @@ -688,8 +688,9 @@ static int isp4sd_pwroff_and_deinit(struct isp4_subdev *isp_subdev)
> > > > > > > > > > return 0;
> > > > > > > > > > }
> > > > > > > > > > - for (int i = 0; i < ISP4SD_MAX_FW_RESP_STREAM_NUM; i++)
> > > > > > > > > > - disable_irq(isp_subdev->irq[i]);
> > > > > > > > > > + if (irq_enabled)
> > > > > > > > > > + for (int i = 0; i < ISP4SD_MAX_FW_RESP_STREAM_NUM; i++)
> > > > > > > > > > + disable_irq(isp_subdev->irq[i]);
> > > > > > > > > > isp4sd_stop_resp_proc_threads(isp_subdev);
> > > > > > > > > > dev_dbg(dev, "isp_subdev stop resp proc streads suc");
> > > > > > > > > > @@ -785,7 +786,7 @@ static int isp4sd_pwron_and_init(struct isp4_subdev *isp_subdev)
> > > > > > > > > > return 0;
> > > > > > > > > > err_unlock_and_close:
> > > > > > > > > > - isp4sd_pwroff_and_deinit(isp_subdev);
> > > > > > > > > > + isp4sd_pwroff_and_deinit(isp_subdev, false);
> > > > > > > > > > return -EINVAL;
> > > > > > > > > > }
> > > > > > > > > > @@ -957,7 +958,7 @@ static int isp4sd_set_power(struct v4l2_subdev *sd, int on)
> > > > > > > > > > if (on)
> > > > > > > > > > return isp4sd_pwron_and_init(isp_subdev);
> > > > > > > > > > else
> > > > > > > > > > - return isp4sd_pwroff_and_deinit(isp_subdev);
> > > > > > > > > > + return isp4sd_pwroff_and_deinit(isp_subdev, true);
> > > > > > > > > > }
> > > > > > > > > > static const struct v4l2_subdev_core_ops isp4sd_core_ops = {
> > > > > > > > > >
> > > > > > > > > > > On the other hand, please also add the patch in amdgpu which sets *bo to
> > > > > > > > > > > NULL in isp_kernel_buffer_alloc() which you mentioned in another thread.
> > > > > > > > > >
> > > > > > > > > > Yep, I have been doing all v5 testing with that patch applied.
> > > > > > > > > >
> > > > > > > > > > BTW, I have verified the IRQ changes are not the cause for the regression; I
> > > > > > > > > > tested with IRQs kept enabled all the time and the issue still occurs.
> > > > > > > > > >
> > > > > > > > > > I did observe that ISP stops sending interrupts when the video stream freezes.
> > > > > > > > > > And, if I replicate the bug enough times, it seems to permanently break FW until
> > > > > > > > > > a full machine reboot. Reloading amd_capture with the v4 driver doesn't recover
> > > > > > > > > > the ISP when this happens.
> > > > > > > > > >
> > > > > > > > > > As an improvement to the driver, can we do a hard reset of ISP on driver probe?
> > > > > > > > > > I am assuming hardware doesn't need too long to settle after hard reset, maybe
> > > > > > > > > > a few hundred milliseconds? This would ensure ISP FW is always in a working
> > > > > > > > > > state when the driver is loaded.
> > > > > > > > > >
> > > > > > > >
> > > > > > > > Actually, each time the camera is activated, the ISP driver powers on the
> > > > > > > > ISP and initiates its firmware from the beginning; when the camera is
> > > > > > > > closed, the ISP is powered off..
> > > > > > >
> > > > > > > Hmm, well I am able to put the ISP in a completely unusable state that doesn't
> > > > > > > recover when I unload and reload amd_capture. Or maybe it is the sensor that is
> > > > > > > stuck in a broken state?
> > > > > >
> > > > > > Here is the log output when I try to start cheese after unloading and reloading
> > > > > > amd_capture, where the ISP is in the broken state that requires rebooting the
> > > > > > laptop (annotated with notes of what I saw/did at each point in time):
> > > > > >
> > > > > > ==> opened cheese
> > > > > > ==> cheese froze after a few seconds
> > > > > > ==> closed cheese
> > > > > > [ 34.570823] amd_isp_capture amd_isp_capture: fail to disable stream
> > > > > > [ 35.077503] amd_isp_capture amd_isp_capture: fail to stop steam
> > > > > > [ 35.077525] amd_isp_capture amd_isp_capture: disabling streaming failed (-110)
> > > > > > ==> unloaded amd_capture
> > > > > > ==> loaded amd_capture
> > > > > > ==> opened cheese
> > > > > > [ 308.039721] amd_isp_capture amd_isp_capture: ISP CCPU FW boot failed
> > > > > > [ 308.043961] amd_isp_capture amd_isp_capture: fail to start isp_subdev interface
> > > > > > [ 308.044188] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.044194] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.044196] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.044197] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.044198] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.044198] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.044199] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.044200] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.044200] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.044201] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.044202] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.065226] amd_isp_capture amd_isp_capture: power up isp fail -22
> > > > > > [ 308.174814] amd_isp_capture amd_isp_capture: ISP CCPU FW boot failed
> > > > > > [ 308.177807] amd_isp_capture amd_isp_capture: fail to start isp_subdev interface
> > > > > > [ 308.178036] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.178043] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.178044] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.178045] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.178046] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.178047] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.178048] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.178048] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.178049] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.178050] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.178050] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.198776] amd_isp_capture amd_isp_capture: power up isp fail -22
> > > > > > [ 308.306835] amd_isp_capture amd_isp_capture: ISP CCPU FW boot failed
> > > > > > [ 308.311533] amd_isp_capture amd_isp_capture: fail to start isp_subdev interface
> > > > > > [ 308.311723] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.311723] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.311724] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.311725] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.311725] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.311726] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.311726] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.311726] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.311727] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.311727] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.311727] amd_isp_capture amd_isp_capture: invalid mem_info
> > > > > > [ 308.335281] amd_isp_capture amd_isp_capture: power up isp fail -22
> > > > > >
> > > > >
> > > > > Thanks Sultan for the detailed info, I agree with you, tend to believe it
> > > > > may related to the sensor, I will follow up with the FW team to investigate
> > > > > further.
> > > > >
> > > > > > > > > > Thanks,
> > > > > > > > > > Sultan
> > > > > > > > >
> > > > > > > > > A small update: I reproduced the issue on v4, but it took several more cycles of
> > > > > > > > > closing/opening cheese and waiting 30s compared to v5.
> > > > > > > > >
> > > > > > > > > Right now my best guess is that this is a timing issue with respect to FW that
> > > > > > > > > was exposed by the v5 changes. v5 introduced slight changes in code timing, like
> > > > > > > > > with the mutex locks getting replaced by spin locks.
> > > > > > > > >
> > > > > > > > > I'll try to insert mdelays to see if I can expose the issue that way on v4.
> > > > > > > > >
> > > > > > > >
> > > > > > > > Could you kindly provide the FW used?
> > > > > > >
> > > > > > > commit a89515d3ff79f12099f7a51b0f4932b881b7720e
> > > > > > > Author: Pratap Nirujogi <pratap.nirujogi@....com>
> > > > > > > Date: Thu Aug 21 15:40:45 2025 -0400
> > > > > > >
> > > > > > > amdgpu: Update ISP FW for isp v4.1.1
> > > > > > > From internal git commit:
> > > > > > > 24557b7326e539183b3bc44cf8e1496c74d383d6
> > > > > > > Signed-off-by: Pratap Nirujogi <pratap.nirujogi@....com>
> > > > > > >
> > > > > > > Sultan
> > > > > >
> > > > > > Sultan
> > > > >
> > > > > --
> > > > > Regards,
> > > > > Bin
> > > > >
> > > >
> > > > Thanks, Bin. I looked deeper at the code and didn't find any reason the issue
> > > > could be due to the driver. Also, the problem happens outside of cheese for me
> > > > (like in Chromium with Zoom meetings), so v5 of the driver is pretty much
> > > > unusable for me until this issue is fixed. :(
> > > >
> > >
> > > Oh, really sad to hear that :(, there must be some difference between our
> > > platforms because we still can't reproduce the issue you mentioned, to help
> > > on this, would you share more info like your Ubuntu version, Kernel
> > > version/source, ISP driver version, BIOS version, .config used to build the
> > > kernel, FW: commit a89515d3ff79f12099f7a51b0f4932b881b7720e.
> > > Just wondering, if possible, could you provide the kernel image either so we
> > > can directly test on it. Also, the HW is not broken, right?
> >
> > I figured out why you cannot reproduce the issue. You need to pass amd_iommu=off
> > on the kernel command line to trigger the issue.
> >
> > The reason I am using amd_iommu=off is because this laptop otherwise doesn't
> > ever wake from suspend under Linux once it reaches the S0i3 state. The keyboard,
> > power button, and lid do not respond to wake up the laptop from suspend. This
> > happens 100% of the time once S0i3 is reached, and occurs on the OEM Ubuntu
> > image from HP as well. The only fix I have found is to pass amd_iommu=off, which
> > other owners of this laptop also found fixes the issue.
> >
> > >
> > > > I've attached a v2 of my big patch, which includes more improvements and another
> > > > ringbuffer bug fix. Please check the ringbuffer logic on the FW side to make
> > > > sure FW doesn't have the same bug, where it may let rd_ptr == wr_ptr upon
> > > > filling the ringbuffer, even though rd_ptr == wr_ptr is supposed to indicate the
> > > > ringbuffer is empty.
> > > >
> > >
> > > Thank you for your huge contribution. We'll review, verify, and merge as
> > > much as possible into v6 and hope this marks the final significant update.
> > > We typically avoid large changes to reduce regression risks and minimize
> > > additional debugging, testing, and schedule impact.
> >
> > I understand. Don't worry, that is indeed the final significant update. Please
> > let me know which changes you don't merge in, since it could be an important
> > change. And thank you for considering my changes! :)
> >
> > And please be sure to check the ringbuffer code in FW to see if it has the same
> > bug I found in the driver.
> >
> > > > Also, I have a suggestion for a FW change to improve IRQ handling in the driver:
> > > >
> > > > 1. Change ISP_SYS_INT0_ACK behavior so that it also clears the acked interrupts
> > > > from ISP_SYS_INT0_EN.
> > > >
> > >
> > > Based on my understanding, this pertains to the hardware design and cannot
> > > be modified.
> > >
> > > > 2. Change ISP_SYS_INT0_EN behavior so that it only enables the interrupts in the
> > > > provided mask, so RMW of ISP_SYS_INT0_EN in the driver won't be necessary to
> > > > re-enable interrupts for a stream.
> > > >
> > >
> > > I'm not sure I understand your point. Are you saying that ISP_SYS_INT0_EN
> > > only considers '1' in the mask and ignores '0'? If that's the case, I'm
> > > curious about how to disable an interrupt. Also, this is also determined by
> > > the hardware design.
> >
> > No worries, it's not a big deal. Just a small optimization I thought of.
> >
> > My idea was:
> >
> > 1. Current behavior of ISP_SYS_INT0_ACK:
> > isp4hw_wreg(mmio, ISP_SYS_INT0_ACK, intr_ack) results in:
> >
> > regmap[ISP_SYS_INT0_STATUS] &= ~intr_ack;
> >
> > Proposed behavior of ISP_SYS_INT0_ACK:
> > isp4hw_wreg(mmio, ISP_SYS_INT0_ACK, intr_ack) results in:
> >
> > regmap[ISP_SYS_INT0_STATUS] &= ~intr_ack;
> > regmap[ISP_SYS_INT0_EN] &= ~intr_ack;
> >
> > 2. Current behavior of ISP_SYS_INT0_EN:
> > isp4hw_wreg(mmio, ISP_SYS_INT0_EN, intr_en) results in:
> >
> > regmap[ISP_SYS_INT0_EN] = intr_en;
> >
> > Proposed behavior of ISP_SYS_INT0_EN:
> > isp4hw_wreg(mmio, ISP_SYS_INT0_EN, intr_en) results in:
> >
> > regmap[ISP_SYS_INT0_EN] |= intr_en;
> >
> >
> > And to disable an interrupt with this design, you can write to ISP_SYS_INT0_ACK.
> >
> > Sultan
>
> Hi Bin,
>
> Thanks to Mario's help, I'm running with the IOMMU enabled now and as a result,
> I'm able to use the v5 driver without issue. No more freezes!
>
> Since I'm able to use v5 now, I was able to perform more testing on my big
> v2-media-platform-amd-Big-squash-of-fixes-cleanup-on.patch I sent before.
>
> I found a regression in my big patch where stopping the stream would fail 100%
> of the time, tested by opening and then closing cheese. I've attached a small
> fix for this.
>
> Please apply media-platform-amd-Don-t-wait-for-cmd_done-under-isp.patch on top
> of v2-media-platform-amd-Big-squash-of-fixes-cleanup-on.patch.
>
> With these two patches applied on top of v5, everything works well for me. :)
>
> FYI, I think there is an issue in the FW's error handling, because that bug in
> my big patch breaks the ISP until I reboot the laptop, with the same symptoms as
> what I reported before when I was testing v5 with IOMMU disabled (and _without_
> any of my changes to the driver).
>
> Maybe you can take advantage of the bug I caused, and use it to find why the ISP
> or sensor never recovers after the driver fails to disable the stream.
>
> Cheers,
> Sultan
Oops, I based media-platform-amd-Don-t-wait-for-cmd_done-under-isp.patch on top
of v1 of my big patch on accident, so it doesn't apply cleanly on v2 big patch.
I've attached a corrected version that is based on top of _v2_ of my big patch.
Sorry for the churn!
Sultan
View attachment "v2-media-platform-amd-Don-t-wait-for-cmd_done-under-.patch" of type "text/plain" (5424 bytes)
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