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Subject: Re: [PATCH v2 1/3] drm/msm: adreno: Make speed-bin support generic
To:     Jordan Crouse <jcrouse@codeaurora.org>
References: <1606481386-22867-1-git-send-email-akhilpo@codeaurora.org>
 <20201130170231.GF16856@jcrouse1-lnx.qualcomm.com>
Cc:     freedreno@lists.freedesktop.org, devicetree@vger.kernel.org,
        robh@kernel.org, dri-devel@freedesktop.org,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
        mka@chromium.org, robdclark@gmail.com, dianders@chromium.org
From:   Akhil P Oommen <akhilpo@codeaurora.org>
Message-ID: <1911b3dc-407d-01a0-e4f2-72c0e331236b@codeaurora.org>
Date:   Wed, 2 Dec 2020 21:00:09 +0530
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<< Resending since Jordan wasn't in the CC list >>

On 11/30/2020 10:32 PM, Jordan Crouse wrote:
> On Fri, Nov 27, 2020 at 06:19:44PM +0530, Akhil P Oommen wrote:
>> So far a530v2 gpu has support for detecting its supported opps
>> based on a fuse value called speed-bin. This patch makes this
>> support generic across gpu families. This is in preparation to
>> extend speed-bin support to a6x family.
>>
>> Signed-off-by: Akhil P Oommen <akhilpo@codeaurora.org>
>> ---
>> Changes from v1:
>> 	1. Added the changes to support a618 sku to the series.
>> 	2. Avoid failing probe in case of an unsupported sku. (Rob)
>>
>>   drivers/gpu/drm/msm/adreno/a5xx_gpu.c      | 34 --------------
>>   drivers/gpu/drm/msm/adreno/adreno_device.c |  4 ++
>>   drivers/gpu/drm/msm/adreno/adreno_gpu.c    | 71 ++++++++++++++++++++++++++++++
>>   drivers/gpu/drm/msm/adreno/adreno_gpu.h    |  5 +++
>>   4 files changed, 80 insertions(+), 34 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
>> index 8fa5c91..7d42321 100644
>> --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
>> +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
>> @@ -1531,38 +1531,6 @@ static const struct adreno_gpu_funcs funcs = {
>>   	.get_timestamp = a5xx_get_timestamp,
>>   };
>>   
>> -static void check_speed_bin(struct device *dev)
>> -{
>> -	struct nvmem_cell *cell;
>> -	u32 val;
>> -
>> -	/*
>> -	 * If the OPP table specifies a opp-supported-hw property then we have
>> -	 * to set something with dev_pm_opp_set_supported_hw() or the table
>> -	 * doesn't get populated so pick an arbitrary value that should
>> -	 * ensure the default frequencies are selected but not conflict with any
>> -	 * actual bins
>> -	 */
>> -	val = 0x80;
>> -
>> -	cell = nvmem_cell_get(dev, "speed_bin");
>> -
>> -	if (!IS_ERR(cell)) {
>> -		void *buf = nvmem_cell_read(cell, NULL);
>> -
>> -		if (!IS_ERR(buf)) {
>> -			u8 bin = *((u8 *) buf);
>> -
>> -			val = (1 << bin);
>> -			kfree(buf);
>> -		}
>> -
>> -		nvmem_cell_put(cell);
>> -	}
>> -
>> -	dev_pm_opp_set_supported_hw(dev, &val, 1);
>> -}
>> -
>>   struct msm_gpu *a5xx_gpu_init(struct drm_device *dev)
>>   {
>>   	struct msm_drm_private *priv = dev->dev_private;
>> @@ -1588,8 +1556,6 @@ struct msm_gpu *a5xx_gpu_init(struct drm_device *dev)
>>   
>>   	a5xx_gpu->lm_leakage = 0x4E001A;
>>   
>> -	check_speed_bin(&pdev->dev);
>> -
>>   	ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs, 4);
>>   	if (ret) {
>>   		a5xx_destroy(&(a5xx_gpu->base.base));
>> diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
>> index 87c8b03..e0ff16c 100644
>> --- a/drivers/gpu/drm/msm/adreno/adreno_device.c
>> +++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
>> @@ -18,6 +18,8 @@ bool snapshot_debugbus = false;
>>   MODULE_PARM_DESC(snapshot_debugbus, "Include debugbus sections in GPU devcoredump (if not fused off)");
>>   module_param_named(snapshot_debugbus, snapshot_debugbus, bool, 0600);
>>   
>> +const u32 a530v2_speedbins[] = {0, 1, 2, 3, 4, 5, 6, 7};
>> +
>>   static const struct adreno_info gpulist[] = {
>>   	{
>>   		.rev   = ADRENO_REV(2, 0, 0, 0),
>> @@ -163,6 +165,8 @@ static const struct adreno_info gpulist[] = {
>>   			ADRENO_QUIRK_FAULT_DETECT_MASK,
>>   		.init = a5xx_gpu_init,
>>   		.zapfw = "a530_zap.mdt",
>> +		.speedbins = a530v2_speedbins,
>> +		.speedbins_count = ARRAY_SIZE(a530v2_speedbins),
>>   	}, {
>>   		.rev = ADRENO_REV(5, 4, 0, 2),
>>   		.revn = 540,
>> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
>> index f21561d..b342fa4 100644
>> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
>> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
>> @@ -14,6 +14,7 @@
>>   #include <linux/pm_opp.h>
>>   #include <linux/slab.h>
>>   #include <linux/soc/qcom/mdt_loader.h>
>> +#include <linux/nvmem-consumer.h>
>>   #include <soc/qcom/ocmem.h>
>>   #include "adreno_gpu.h"
>>   #include "msm_gem.h"
>> @@ -891,6 +892,69 @@ void adreno_gpu_ocmem_cleanup(struct adreno_ocmem *adreno_ocmem)
>>   			   adreno_ocmem->hdl);
>>   }
>>   
>> +static int adreno_set_supported_hw(struct device *dev,
>> +		struct adreno_gpu *adreno_gpu)
>> +{
>> +	u8 speedbins_count = adreno_gpu->info->speedbins_count;
>> +	const u32 *speedbins = adreno_gpu->info->speedbins;
>> +	struct nvmem_cell *cell;
>> +	u32 bin, i;
>> +	u32 val = 0;
>> +	void *buf, *opp_table;
>> +
>> +	cell = nvmem_cell_get(dev, "speed_bin");
>> +	/*
>> +	 * -ENOENT means that the platform doesn't support speedbin which is
>> +	 * fine
>> +	 */
>> +	if (PTR_ERR(cell) == -ENOENT)
>> +		return 0;
>> +	else if (IS_ERR(cell))
>> +		return PTR_ERR(cell);
>> +
>> +	if (!speedbins)
>> +		goto done;
>> +
>> +	buf = nvmem_cell_read(cell, NULL);
>> +	if (IS_ERR(buf)) {
>> +		nvmem_cell_put(cell);
>> +		return PTR_ERR(buf);
>> +	}
>> +
>> +	bin = *((u32 *) buf);
>> +
>> +	for (i = 0; i < speedbins_count; i++) {
>> +		if (bin == speedbins[i]) {
>> +			val = (1 << i);
>> +			break;
>> +		}
>> +	}
>> +
>> +	kfree(buf);
>> +done:
>> +	nvmem_cell_put(cell);
>> +
>> +	if (!val) {
>> +		DRM_DEV_ERROR(dev,
>> +				"missing support for speed-bin: %u. Some OPPs may not be supported by hardware",
>> +				bin);
>> +		val = ~0U;
>> +	}
>> +
>> +	opp_table = dev_pm_opp_set_supported_hw(dev, &val, 1);
>> +	if (IS_ERR(opp_table))
>> +		return PTR_ERR(opp_table);
>> +
>> +	adreno_gpu->opp_table = opp_table;
>> +	return 0;
>> +}
>> +
>> +static void adreno_put_supported_hw(struct opp_table *opp_table)
>> +{
>> +	if (opp_table)
>> +		dev_pm_opp_put_supported_hw(opp_table);
>> +}
>> +
>>   int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
>>   		struct adreno_gpu *adreno_gpu,
>>   		const struct adreno_gpu_funcs *funcs, int nr_rings)
>> @@ -899,6 +963,7 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
>>   	struct adreno_platform_config *config = dev->platform_data;
>>   	struct msm_gpu_config adreno_gpu_config  = { 0 };
>>   	struct msm_gpu *gpu = &adreno_gpu->base;
>> +	int ret;
>>   
>>   	adreno_gpu->funcs = funcs;
>>   	adreno_gpu->info = adreno_info(config->rev);
>> @@ -910,6 +975,10 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
>>   
>>   	adreno_gpu_config.nr_rings = nr_rings;
>>   
>> +	ret = adreno_set_supported_hw(dev, adreno_gpu);
>> +	if (ret)
>> +		return ret;
>> +
> 
> I still don't understand why we are doing this here instead of a5xx_gpu.c and
> a6xx_gpu.c.
> 
> Jordan

Could you please clarify why you prefer so?

-Akhil
> 
>>   	adreno_get_pwrlevels(dev, gpu);
>>   
>>   	pm_runtime_set_autosuspend_delay(dev,
>> @@ -936,4 +1005,6 @@ void adreno_gpu_cleanup(struct adreno_gpu *adreno_gpu)
>>   
>>   	icc_put(gpu->icc_path);
>>   	icc_put(gpu->ocmem_icc_path);
>> +
>> +	adreno_put_supported_hw(adreno_gpu->opp_table);
>>   }
>> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
>> index c3775f7..a756ad7 100644
>> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
>> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
>> @@ -55,6 +55,7 @@ struct adreno_reglist {
>>   };
>>   
>>   extern const struct adreno_reglist a630_hwcg[], a640_hwcg[], a650_hwcg[];
>> +extern const u32 a618_speedbins[];
>>   
>>   struct adreno_info {
>>   	struct adreno_rev rev;
>> @@ -67,6 +68,8 @@ struct adreno_info {
>>   	const char *zapfw;
>>   	u32 inactive_period;
>>   	const struct adreno_reglist *hwcg;
>> +	const u32 *speedbins;
>> +	const u8 speedbins_count;
>>   };
>>   
>>   const struct adreno_info *adreno_info(struct adreno_rev rev);
>> @@ -112,6 +115,8 @@ struct adreno_gpu {
>>   	 * code (a3xx_gpu.c) and stored in this common location.
>>   	 */
>>   	const unsigned int *reg_offsets;
>> +
>> +	struct opp_table *opp_table;
>>   };
>>   #define to_adreno_gpu(x) container_of(x, struct adreno_gpu, base)
>>   
>> -- 
>> 2.7.4
>>
>