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Date:   Fri, 16 Jun 2023 23:24:32 +0530
From:   Akhil P Oommen <quic_akhilpo@quicinc.com>
To:     Konrad Dybcio <konrad.dybcio@linaro.org>
CC:     Rob Clark <robdclark@chromium.org>,
        <freedreno@lists.freedesktop.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        <devicetree@vger.kernel.org>, Sean Paul <sean@poorly.run>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@somainline.org>,
        Abhinav Kumar <quic_abhinavk@quicinc.com>,
        <dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>,
        Rob Clark <robdclark@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        <linux-arm-msm@vger.kernel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Marijn Suijten <marijn.suijten@somainline.org>,
        David Airlie <airlied@gmail.com>
Subject: Re: [Freedreno] [PATCH v8 10/18] drm/msm/a6xx: Introduce GMU wrapper
 support
Message-ID: <z5imqaxyumc5pyk4ijumjby4tswfmnjsnedeekonx5tymhwsfi@h5dk3pl2zawf>
References: <20230223-topic-gmuwrapper-v8-0-69c68206609e@linaro.org>
 <20230223-topic-gmuwrapper-v8-10-69c68206609e@linaro.org>
 <2vr72w4tslxxumzphtuwgkcnbfjrtmw2j4qak2cukcabchadlg@spjbqoa7v4lr>
 <c5396101-ad5b-afdd-d6d7-1a2efa3b9bf7@linaro.org>
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In-Reply-To: <c5396101-ad5b-afdd-d6d7-1a2efa3b9bf7@linaro.org>
Precedence: bulk

On Thu, Jun 15, 2023 at 11:43:04PM +0200, Konrad Dybcio wrote:
> 
> On 10.06.2023 00:06, Akhil P Oommen wrote:
> > On Mon, May 29, 2023 at 03:52:29PM +0200, Konrad Dybcio wrote:
> >>
> >> Some (particularly SMD_RPM, a.k.a non-RPMh) SoCs implement A6XX GPUs
> >> but don't implement the associated GMUs. This is due to the fact that
> >> the GMU directly pokes at RPMh. Sadly, this means we have to take care
> >> of enabling & scaling power rails, clocks and bandwidth ourselves.
> >>
> >> Reuse existing Adreno-common code and modify the deeply-GMU-infused
> >> A6XX code to facilitate these GPUs. This involves if-ing out lots
> >> of GMU callbacks and introducing a new type of GMU - GMU wrapper (it's
> >> the actual name that Qualcomm uses in their downstream kernels).
> >>
> >> This is essentially a register region which is convenient to model
> >> as a device. We'll use it for managing the GDSCs. The register
> >> layout matches the actual GMU_CX/GX regions on the "real GMU" devices
> >> and lets us reuse quite a bit of gmu_read/write/rmw calls.
> >>
> >> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
> >> ---
> >>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c       |  72 +++++++++-
> >>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c       | 211 ++++++++++++++++++++++++----
> >>  drivers/gpu/drm/msm/adreno/a6xx_gpu.h       |   1 +
> >>  drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c |  14 +-
> >>  drivers/gpu/drm/msm/adreno/adreno_gpu.c     |   8 +-
> >>  drivers/gpu/drm/msm/adreno/adreno_gpu.h     |   6 +
> >>  6 files changed, 277 insertions(+), 35 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> >> index 5ba8cba69383..385ca3a12462 100644
> >> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> >> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> >> @@ -1437,6 +1437,7 @@ static int a6xx_gmu_get_irq(struct a6xx_gmu *gmu, struct platform_device *pdev,
> >>  
> >>  void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu)
> >>  {
> >> +	struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
> >>  	struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
> >>  	struct platform_device *pdev = to_platform_device(gmu->dev);
> >>  
> >> @@ -1462,10 +1463,12 @@ void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu)
> >>  	gmu->mmio = NULL;
> >>  	gmu->rscc = NULL;
> >>  
> >> -	a6xx_gmu_memory_free(gmu);
> >> +	if (!adreno_has_gmu_wrapper(adreno_gpu)) {
> >> +		a6xx_gmu_memory_free(gmu);
> >>  
> >> -	free_irq(gmu->gmu_irq, gmu);
> >> -	free_irq(gmu->hfi_irq, gmu);
> >> +		free_irq(gmu->gmu_irq, gmu);
> >> +		free_irq(gmu->hfi_irq, gmu);
> >> +	}
> >>  
> >>  	/* Drop reference taken in of_find_device_by_node */
> >>  	put_device(gmu->dev);
> >> @@ -1484,6 +1487,69 @@ static int cxpd_notifier_cb(struct notifier_block *nb,
> >>  	return 0;
> >>  }
> >>  
> >> +int a6xx_gmu_wrapper_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
> >> +{
> >> +	struct platform_device *pdev = of_find_device_by_node(node);
> >> +	struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
> >> +	int ret;
> >> +
> >> +	if (!pdev)
> >> +		return -ENODEV;
> >> +
> >> +	gmu->dev = &pdev->dev;
> >> +
> >> +	of_dma_configure(gmu->dev, node, true);
> >> +
> >> +	pm_runtime_enable(gmu->dev);
> >> +
> >> +	/* Mark legacy for manual SPTPRAC control */
> >> +	gmu->legacy = true;
> >> +
> >> +	/* Map the GMU registers */
> >> +	gmu->mmio = a6xx_gmu_get_mmio(pdev, "gmu");
> >> +	if (IS_ERR(gmu->mmio)) {
> >> +		ret = PTR_ERR(gmu->mmio);
> >> +		goto err_mmio;
> >> +	}
> >> +
> >> +	gmu->cxpd = dev_pm_domain_attach_by_name(gmu->dev, "cx");
> >> +	if (IS_ERR(gmu->cxpd)) {
> >> +		ret = PTR_ERR(gmu->cxpd);
> >> +		goto err_mmio;
> >> +	}
> >> +
> >> +	if (!device_link_add(gmu->dev, gmu->cxpd, DL_FLAG_PM_RUNTIME)) {
> >> +		ret = -ENODEV;
> >> +		goto detach_cxpd;
> >> +	}
> >> +
> >> +	init_completion(&gmu->pd_gate);
> >> +	complete_all(&gmu->pd_gate);
> >> +	gmu->pd_nb.notifier_call = cxpd_notifier_cb;
> >> +
> >> +	/* Get a link to the GX power domain to reset the GPU */
> >> +	gmu->gxpd = dev_pm_domain_attach_by_name(gmu->dev, "gx");
> >> +	if (IS_ERR(gmu->gxpd)) {
> >> +		ret = PTR_ERR(gmu->gxpd);
> >> +		goto err_mmio;
> >> +	}
> >> +
> >> +	gmu->initialized = true;
> >> +
> >> +	return 0;
> >> +
> >> +detach_cxpd:
> >> +	dev_pm_domain_detach(gmu->cxpd, false);
> >> +
> >> +err_mmio:
> >> +	iounmap(gmu->mmio);
> >> +
> >> +	/* Drop reference taken in of_find_device_by_node */
> >> +	put_device(gmu->dev);
> >> +
> >> +	return ret;
> >> +}
> >> +
> >>  int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
> >>  {
> >>  	struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
> >> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> >> index 58bf405b85d8..0a44762dbb6d 100644
> >> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> >> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> >> @@ -21,7 +21,7 @@ static inline bool _a6xx_check_idle(struct msm_gpu *gpu)
> >>  	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
> >>  
> >>  	/* Check that the GMU is idle */
> >> -	if (!a6xx_gmu_isidle(&a6xx_gpu->gmu))
> >> +	if (!adreno_has_gmu_wrapper(adreno_gpu) && !a6xx_gmu_isidle(&a6xx_gpu->gmu))
> >>  		return false;
> >>  
> >>  	/* Check tha the CX master is idle */
> >> @@ -1018,10 +1018,13 @@ static int hw_init(struct msm_gpu *gpu)
> >>  {
> >>  	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> >>  	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
> >> +	struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
> >>  	int ret;
> >>  
> >> -	/* Make sure the GMU keeps the GPU on while we set it up */
> >> -	a6xx_gmu_set_oob(&a6xx_gpu->gmu, GMU_OOB_GPU_SET);
> >> +	if (!adreno_has_gmu_wrapper(adreno_gpu)) {
> >> +		/* Make sure the GMU keeps the GPU on while we set it up */
> >> +		a6xx_gmu_set_oob(&a6xx_gpu->gmu, GMU_OOB_GPU_SET);
> >> +	}
> >>  
> >>  	/* Clear GBIF halt in case GX domain was not collapsed */
> >>  	if (a6xx_has_gbif(adreno_gpu)) {
> >> @@ -1148,6 +1151,17 @@ static int hw_init(struct msm_gpu *gpu)
> >>  			0x3f0243f0);
> >>  	}
> >>  
> >> +	if (adreno_has_gmu_wrapper(adreno_gpu)) {
> >> +		/* Do it here, as GMU wrapper only inits the GMU for memory reservation etc. */
> >> +
> >> +		/* Set up the CX GMU counter 0 to count busy ticks */
> >> +		gmu_write(gmu, REG_A6XX_GPU_GMU_AO_GPU_CX_BUSY_MASK, 0xff000000);
> >> +
> >> +		/* Enable power counter 0 */
> >> +		gmu_rmw(gmu, REG_A6XX_GMU_CX_GMU_POWER_COUNTER_SELECT_0, 0xff, BIT(5));
> >> +		gmu_write(gmu, REG_A6XX_GMU_CX_GMU_POWER_COUNTER_ENABLE, 1);
> >> +	}
> > 
> > nit: For gmu targets, we do this at a6xx_rpmh_start() which is an odd place
> > to keep this. But I don't know the reason why it was decided to keep it
> > there. I don't see any reason why we cannot keep it here for both
> > gmu/gmu-wrapper like in the downstream driver.
> I split it up into a separate patch and reused for the next revision.
> Tested on A630, the GMU doesn't complain.
> 
> > 
> >> +
> >>  	/* Protect registers from the CP */
> >>  	a6xx_set_cp_protect(gpu);
> >>  
> >> @@ -1237,6 +1251,8 @@ static int hw_init(struct msm_gpu *gpu)
> >>  	}
> >>  
> >>  out:
> >> +	if (adreno_has_gmu_wrapper(adreno_gpu))
> >> +		return ret;
> >>  	/*
> >>  	 * Tell the GMU that we are done touching the GPU and it can start power
> >>  	 * management
> >> @@ -1271,9 +1287,6 @@ static void a6xx_dump(struct msm_gpu *gpu)
> >>  	adreno_dump(gpu);
> >>  }
> >>  
> >> -#define VBIF_RESET_ACK_TIMEOUT	100
> >> -#define VBIF_RESET_ACK_MASK	0x00f0
> >> -
> >>  static void a6xx_recover(struct msm_gpu *gpu)
> >>  {
> >>  	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> >> @@ -1311,6 +1324,15 @@ static void a6xx_recover(struct msm_gpu *gpu)
> >>  	 */
> >>  	gpu->active_submits = 0;
> >>  
> >> +	if (adreno_has_gmu_wrapper(adreno_gpu)) {
> >> +		/* Drain the outstanding traffic on memory buses */
> >> +		a6xx_bus_clear_pending_transactions(adreno_gpu, true);
> >> +
> >> +		/* Reset the GPU to a clean state */
> >> +		a6xx_gpu_sw_reset(gpu, true);
> >> +		a6xx_gpu_sw_reset(gpu, false);
> >> +	}
> >> +
> >>  	reinit_completion(&gmu->pd_gate);
> >>  	dev_pm_genpd_add_notifier(gmu->cxpd, &gmu->pd_nb);
> >>  	dev_pm_genpd_synced_poweroff(gmu->cxpd);
> >> @@ -1461,7 +1483,8 @@ static void a6xx_fault_detect_irq(struct msm_gpu *gpu)
> >>  	 * Force the GPU to stay on until after we finish
> >>  	 * collecting information
> >>  	 */
> >> -	gmu_write(&a6xx_gpu->gmu, REG_A6XX_GMU_GMU_PWR_COL_KEEPALIVE, 1);
> >> +	if (!adreno_has_gmu_wrapper(adreno_gpu))
> >> +		gmu_write(&a6xx_gpu->gmu, REG_A6XX_GMU_GMU_PWR_COL_KEEPALIVE, 1);
> >>  
> >>  	DRM_DEV_ERROR(&gpu->pdev->dev,
> >>  		"gpu fault ring %d fence %x status %8.8X rb %4.4x/%4.4x ib1 %16.16llX/%4.4x ib2 %16.16llX/%4.4x\n",
> >> @@ -1592,6 +1615,10 @@ static void a6xx_llc_activate(struct a6xx_gpu *a6xx_gpu)
> >>  
> >>  static void a6xx_llc_slices_destroy(struct a6xx_gpu *a6xx_gpu)
> >>  {
> >> +	/* No LLCC on non-RPMh (and by extension, non-GMU) SoCs */
> >> +	if (adreno_has_gmu_wrapper(&a6xx_gpu->base))
> >> +		return;
> >> +
> >>  	llcc_slice_putd(a6xx_gpu->llc_slice);
> >>  	llcc_slice_putd(a6xx_gpu->htw_llc_slice);
> >>  }
> >> @@ -1601,6 +1628,10 @@ static void a6xx_llc_slices_init(struct platform_device *pdev,
> >>  {
> >>  	struct device_node *phandle;
> >>  
> >> +	/* No LLCC on non-RPMh (and by extension, non-GMU) SoCs */
> >> +	if (adreno_has_gmu_wrapper(&a6xx_gpu->base))
> >> +		return;
> >> +
> >>  	/*
> >>  	 * There is a different programming path for targets with an mmu500
> >>  	 * attached, so detect if that is the case
> >> @@ -1670,7 +1701,7 @@ void a6xx_gpu_sw_reset(struct msm_gpu *gpu, bool assert)
> >>  		udelay(100);
> >>  }
> >>  
> >> -static int a6xx_pm_resume(struct msm_gpu *gpu)
> >> +static int a6xx_gmu_pm_resume(struct msm_gpu *gpu)
> >>  {
> >>  	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> >>  	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
> >> @@ -1690,10 +1721,58 @@ static int a6xx_pm_resume(struct msm_gpu *gpu)
> >>  
> >>  	a6xx_llc_activate(a6xx_gpu);
> >>  
> >> -	return 0;
> >> +	return ret;
> >>  }
> >>  
> >> -static int a6xx_pm_suspend(struct msm_gpu *gpu)
> >> +static int a6xx_pm_resume(struct msm_gpu *gpu)
> >> +{
> >> +	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> >> +	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
> >> +	struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
> >> +	unsigned long freq = gpu->fast_rate;
> >> +	struct dev_pm_opp *opp;
> >> +	int ret;
> >> +
> >> +	gpu->needs_hw_init = true;
> >> +
> >> +	trace_msm_gpu_resume(0);
> >> +
> >> +	mutex_lock(&a6xx_gpu->gmu.lock);
> > 
> > Where is this lock initialized? If the init was moved out of
> > a6xx_gmu_init(), can you please share that patch?
> 12abd735f030 ("drm/msm/a6xx: initialize GMU mutex earlier")
> 
> > 
> >> +
> >> +	opp = dev_pm_opp_find_freq_ceil(&gpu->pdev->dev, &freq);
> >> +	if (IS_ERR(opp)) {
> >> +		ret = PTR_ERR(opp);
> >> +		goto err_set_opp;
> >> +	}
> >> +	dev_pm_opp_put(opp);
> >> +
> >> +	/* Set the core clock and bus bw, having VDD scaling in mind */
> >> +	dev_pm_opp_set_opp(&gpu->pdev->dev, opp);
> >> +
> >> +	pm_runtime_resume_and_get(gmu->dev);
> >> +	pm_runtime_resume_and_get(gmu->gxpd);
> >> +
> >> +	ret = clk_bulk_prepare_enable(gpu->nr_clocks, gpu->grp_clks);
> >> +	if (ret)
> >> +		goto err_bulk_clk;
> >> +
> >> +	/* If anything goes south, tear the GPU down piece by piece.. */
> >> +	if (ret) {
> >> +err_bulk_clk:
> > 
> > Goto jump directly to another block looks odd to me. Why do you need this label
> > anyway?
> If clk_bulk_prepare_enable() fails, trying to proceed will hang the
> platform with unclocked accesses. We need to unwind everything that
> has been done up until that point, in reverse order.

I missed this response from you earlier.

But you are checking for 'ret' twice here. You will end up here even
if you don't jump! So "if (ret) goto err_bulk_clk;" looks
unnecessary.

-Akhil.

> 
> > 
> >> +		pm_runtime_put(gmu->gxpd);
> >> +		pm_runtime_put(gmu->dev);
> >> +		dev_pm_opp_set_opp(&gpu->pdev->dev, NULL);
> >> +	}
> >> +err_set_opp:
> > 
> > Generally, it is better to name the label based on what you do here. For
> > eg: "unlock_lock:".
> That seems to be a mixed bag all throughout the kernel, I've seen many
> usages of err_(what went wrong)
> 
> > 
> > Also, this function is small enough that it is better to return directly
> > in case of error. I think that would be more readable.
> Not really, adding the necessary cleanup steps in `if (ret)`
> blocks would roughly double the function's size.
> 
> > 
> >> +	mutex_unlock(&a6xx_gpu->gmu.lock);
> >> +
> >> +	if (!ret)
> >> +		msm_devfreq_resume(gpu);
> >> +
> >> +	return ret;
> >> +}
> >> +
> >> +static int a6xx_gmu_pm_suspend(struct msm_gpu *gpu)
> >>  {
> >>  	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> >>  	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
> >> @@ -1720,7 +1799,40 @@ static int a6xx_pm_suspend(struct msm_gpu *gpu)
> >>  	return 0;
> >>  }
> >>  
> >> -static int a6xx_get_timestamp(struct msm_gpu *gpu, uint64_t *value)
> >> +static int a6xx_pm_suspend(struct msm_gpu *gpu)
> >> +{
> >> +	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> >> +	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
> >> +	struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
> >> +	int i;
> >> +
> >> +	trace_msm_gpu_suspend(0);
> >> +
> >> +	msm_devfreq_suspend(gpu);
> >> +
> >> +	mutex_lock(&a6xx_gpu->gmu.lock);
> > 
> > Again, is this initialized somewhere?
> > 
> >> +
> >> +	/* Drain the outstanding traffic on memory buses */
> >> +	a6xx_bus_clear_pending_transactions(adreno_gpu, true);
> >> +
> >> +	clk_bulk_disable_unprepare(gpu->nr_clocks, gpu->grp_clks);
> >> +
> >> +	pm_runtime_put_sync(gmu->gxpd);
> >> +	dev_pm_opp_set_opp(&gpu->pdev->dev, NULL);
> >> +	pm_runtime_put_sync(gmu->dev);
> >> +
> >> +	mutex_unlock(&a6xx_gpu->gmu.lock);
> >> +
> >> +	if (a6xx_gpu->shadow_bo)
> >> +		for (i = 0; i < gpu->nr_rings; i++)
> >> +			a6xx_gpu->shadow[i] = 0;
> >> +
> >> +	gpu->suspend_count++;
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +static int a6xx_gmu_get_timestamp(struct msm_gpu *gpu, uint64_t *value)
> >>  {
> >>  	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> >>  	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
> >> @@ -1739,6 +1851,12 @@ static int a6xx_get_timestamp(struct msm_gpu *gpu, uint64_t *value)
> >>  	return 0;
> >>  }
> >>  
> >> +static int a6xx_get_timestamp(struct msm_gpu *gpu, uint64_t *value)
> >> +{
> >> +	*value = gpu_read64(gpu, REG_A6XX_CP_ALWAYS_ON_COUNTER);
> >> +	return 0;
> >> +}
> >> +
> >>  static struct msm_ringbuffer *a6xx_active_ring(struct msm_gpu *gpu)
> >>  {
> >>  	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> >> @@ -2004,8 +2122,8 @@ static const struct adreno_gpu_funcs funcs = {
> >>  		.set_param = adreno_set_param,
> >>  		.hw_init = a6xx_hw_init,
> >>  		.ucode_load = a6xx_ucode_load,
> >> -		.pm_suspend = a6xx_pm_suspend,
> >> -		.pm_resume = a6xx_pm_resume,
> >> +		.pm_suspend = a6xx_gmu_pm_suspend,
> >> +		.pm_resume = a6xx_gmu_pm_resume,
> >>  		.recover = a6xx_recover,
> >>  		.submit = a6xx_submit,
> >>  		.active_ring = a6xx_active_ring,
> >> @@ -2020,6 +2138,35 @@ static const struct adreno_gpu_funcs funcs = {
> >>  #if defined(CONFIG_DRM_MSM_GPU_STATE)
> >>  		.gpu_state_get = a6xx_gpu_state_get,
> >>  		.gpu_state_put = a6xx_gpu_state_put,
> >> +#endif
> >> +		.create_address_space = a6xx_create_address_space,
> >> +		.create_private_address_space = a6xx_create_private_address_space,
> >> +		.get_rptr = a6xx_get_rptr,
> >> +		.progress = a6xx_progress,
> >> +	},
> >> +	.get_timestamp = a6xx_gmu_get_timestamp,
> >> +};
> >> +
> >> +static const struct adreno_gpu_funcs funcs_gmuwrapper = {
> >> +	.base = {
> >> +		.get_param = adreno_get_param,
> >> +		.set_param = adreno_set_param,
> >> +		.hw_init = a6xx_hw_init,
> >> +		.ucode_load = a6xx_ucode_load,
> >> +		.pm_suspend = a6xx_pm_suspend,
> >> +		.pm_resume = a6xx_pm_resume,
> >> +		.recover = a6xx_recover,
> >> +		.submit = a6xx_submit,
> >> +		.active_ring = a6xx_active_ring,
> >> +		.irq = a6xx_irq,
> >> +		.destroy = a6xx_destroy,
> >> +#if defined(CONFIG_DRM_MSM_GPU_STATE)
> >> +		.show = a6xx_show,
> >> +#endif
> >> +		.gpu_busy = a6xx_gpu_busy,
> >> +#if defined(CONFIG_DRM_MSM_GPU_STATE)
> >> +		.gpu_state_get = a6xx_gpu_state_get,
> >> +		.gpu_state_put = a6xx_gpu_state_put,
> >>  #endif
> >>  		.create_address_space = a6xx_create_address_space,
> >>  		.create_private_address_space = a6xx_create_private_address_space,
> >> @@ -2050,15 +2197,31 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
> >>  
> >>  	adreno_gpu->registers = NULL;
> >>  
> >> +	/* Check if there is a GMU phandle and set it up */
> >> +	node = of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0);
> >> +	/* FIXME: How do we gracefully handle this? */
> >> +	BUG_ON(!node);
> >> +
> >> +	adreno_gpu->gmu_is_wrapper = of_device_is_compatible(node, "qcom,adreno-gmu-wrapper");
> >> +
> >>  	/*
> >>  	 * We need to know the platform type before calling into adreno_gpu_init
> >>  	 * so that the hw_apriv flag can be correctly set. Snoop into the info
> >>  	 * and grab the revision number
> >>  	 */
> >>  	info = adreno_info(config->rev);
> >> -
> >> -	if (info && (info->revn == 650 || info->revn == 660 ||
> >> -			adreno_cmp_rev(ADRENO_REV(6, 3, 5, ANY_ID), info->rev)))
> >> +	if (!info)
> >> +		return ERR_PTR(-EINVAL);
> >> +
> >> +	/* Assign these early so that we can use the is_aXYZ helpers */
> >> +	/* Numeric revision IDs (e.g. 630) */
> >> +	adreno_gpu->revn = info->revn;
> >> +	/* New-style ADRENO_REV()-only */
> >> +	adreno_gpu->rev = info->rev;
> >> +	/* Quirk data */
> >> +	adreno_gpu->info = info;
> >> +
> >> +	if (adreno_is_a650(adreno_gpu) || adreno_is_a660_family(adreno_gpu))
> >>  		adreno_gpu->base.hw_apriv = true;
> >>  
> >>  	a6xx_llc_slices_init(pdev, a6xx_gpu);
> >> @@ -2069,7 +2232,10 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
> >>  		return ERR_PTR(ret);
> >>  	}
> >>  
> >> -	ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs, 1);
> >> +	if (adreno_has_gmu_wrapper(adreno_gpu))
> >> +		ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs_gmuwrapper, 1);
> >> +	else
> >> +		ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs, 1);
> >>  	if (ret) {
> >>  		a6xx_destroy(&(a6xx_gpu->base.base));
> >>  		return ERR_PTR(ret);
> >> @@ -2082,13 +2248,10 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
> >>  	if (adreno_is_a618(adreno_gpu) || adreno_is_7c3(adreno_gpu))
> >>  		priv->gpu_clamp_to_idle = true;
> >>  
> >> -	/* Check if there is a GMU phandle and set it up */
> >> -	node = of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0);
> >> -
> >> -	/* FIXME: How do we gracefully handle this? */
> >> -	BUG_ON(!node);
> >> -
> >> -	ret = a6xx_gmu_init(a6xx_gpu, node);
> >> +	if (adreno_has_gmu_wrapper(adreno_gpu))
> >> +		ret = a6xx_gmu_wrapper_init(a6xx_gpu, node);
> >> +	else
> >> +		ret = a6xx_gmu_init(a6xx_gpu, node);
> >>  	of_node_put(node);
> >>  	if (ret) {
> >>  		a6xx_destroy(&(a6xx_gpu->base.base));
> >> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
> >> index aa70390ee1c6..c788b06e72da 100644
> >> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
> >> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
> >> @@ -76,6 +76,7 @@ int a6xx_gmu_set_oob(struct a6xx_gmu *gmu, enum a6xx_gmu_oob_state state);
> >>  void a6xx_gmu_clear_oob(struct a6xx_gmu *gmu, enum a6xx_gmu_oob_state state);
> >>  
> >>  int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node);
> >> +int a6xx_gmu_wrapper_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node);
> >>  void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu);
> >>  
> >>  void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp,
> >> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> >> index 30ecdff363e7..4e5d650578c6 100644
> >> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> >> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> >> @@ -1041,16 +1041,18 @@ struct msm_gpu_state *a6xx_gpu_state_get(struct msm_gpu *gpu)
> >>  	/* Get the generic state from the adreno core */
> >>  	adreno_gpu_state_get(gpu, &a6xx_state->base);
> >>  
> >> -	a6xx_get_gmu_registers(gpu, a6xx_state);
> >> +	if (!adreno_has_gmu_wrapper(adreno_gpu)) {
> >> +		a6xx_get_gmu_registers(gpu, a6xx_state);
> >>  
> >> -	a6xx_state->gmu_log = a6xx_snapshot_gmu_bo(a6xx_state, &a6xx_gpu->gmu.log);
> >> -	a6xx_state->gmu_hfi = a6xx_snapshot_gmu_bo(a6xx_state, &a6xx_gpu->gmu.hfi);
> >> -	a6xx_state->gmu_debug = a6xx_snapshot_gmu_bo(a6xx_state, &a6xx_gpu->gmu.debug);
> >> +		a6xx_state->gmu_log = a6xx_snapshot_gmu_bo(a6xx_state, &a6xx_gpu->gmu.log);
> >> +		a6xx_state->gmu_hfi = a6xx_snapshot_gmu_bo(a6xx_state, &a6xx_gpu->gmu.hfi);
> >> +		a6xx_state->gmu_debug = a6xx_snapshot_gmu_bo(a6xx_state, &a6xx_gpu->gmu.debug);
> >>  /
> >> -	a6xx_snapshot_gmu_hfi_history(gpu, a6xx_state);
> >> +		a6xx_snapshot_gmu_hfi_history(gpu, a6xx_state);
> >> +	}
> >>  
> >>  	/* If GX isn't on the rest of the data isn't going to be accessible */
> >> -	if (!a6xx_gmu_gx_is_on(&a6xx_gpu->gmu))
> >> +	if (!adreno_has_gmu_wrapper(adreno_gpu) && !a6xx_gmu_gx_is_on(&a6xx_gpu->gmu))
> >>  		return &a6xx_state->base;
> >>  
> >>  	/* Get the banks of indexed registers */
> >> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> >> index 6934cee07d42..5c5901d65950 100644
> >> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> >> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> >> @@ -528,6 +528,10 @@ int adreno_load_fw(struct adreno_gpu *adreno_gpu)
> >>  		if (!adreno_gpu->info->fw[i])
> >>  			continue;
> >>  
> >> +		/* Skip loading GMU firwmare with GMU Wrapper */
> >> +		if (adreno_has_gmu_wrapper(adreno_gpu) && i == ADRENO_FW_GMU)
> >> +			continue;
> >> +
> >>  		/* Skip if the firmware has already been loaded */
> >>  		if (adreno_gpu->fw[i])
> >>  			continue;
> >> @@ -1074,8 +1078,8 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
> >>  	u32 speedbin;
> >>  	int ret;
> >>  
> >> -	/* Only handle the core clock when GMU is not in use */
> >> -	if (config->rev.core < 6) {
> >> +	/* Only handle the core clock when GMU is not in use (or is absent). */
> >> +	if (adreno_has_gmu_wrapper(adreno_gpu) || config->rev.core < 6) {
> >>  		/*
> >>  		 * This can only be done before devm_pm_opp_of_add_table(), or
> >>  		 * dev_pm_opp_set_config() will WARN_ON()
> >> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> >> index f62612a5c70f..ee5352bc5329 100644
> >> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> >> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> >> @@ -115,6 +115,7 @@ struct adreno_gpu {
> >>  	 * code (a3xx_gpu.c) and stored in this common location.
> >>  	 */
> >>  	const unsigned int *reg_offsets;
> >> +	bool gmu_is_wrapper;
> >>  };
> >>  #define to_adreno_gpu(x) container_of(x, struct adreno_gpu, base)
> >>  
> >> @@ -145,6 +146,11 @@ struct adreno_platform_config {
> >>  
> >>  bool adreno_cmp_rev(struct adreno_rev rev1, struct adreno_rev rev2);
> >>  
> >> +static inline bool adreno_has_gmu_wrapper(struct adreno_gpu *gpu)
> >> +{
> >> +	return gpu->gmu_is_wrapper;
> >> +}
> >> +
> >>  static inline bool adreno_is_a2xx(struct adreno_gpu *gpu)
> >>  {
> >>  	return (gpu->revn < 300);
> >>
> >> -- 
> >> 2.40.1
> >>
> > 
> > I am still not fully onboard with the idea of gmu_wrapper node in devicetree.
> > Aside from that, I don't see any other issue. Please check the few comments I left.
> Thanks for your review!
> 
> Konrad
> > 
> > -Akhil.
> >