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Message-ID: <20240630102955.uencakbjiugszphw@hu-akhilpo-hyd.qualcomm.com>
Date: Sun, 30 Jun 2024 15:59:55 +0530
From: Akhil P Oommen <quic_akhilpo@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
CC: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
"Abhinav
Kumar" <quic_abhinavk@...cinc.com>,
Dmitry Baryshkov
<dmitry.baryshkov@...aro.org>,
David Airlie <airlied@...il.com>, "Daniel
Vetter" <daniel@...ll.ch>,
Bjorn Andersson <andersson@...nel.org>, Rob
Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor
Dooley <conor+dt@...nel.org>,
Marijn Suijten <marijn.suijten@...ainline.org>,
<linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
<freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 4/5] drm/msm/adreno: Redo the speedbin assignment
On Tue, Jun 25, 2024 at 08:28:09PM +0200, Konrad Dybcio wrote:
> There is no need to reinvent the wheel for simple read-match-set logic.
>
> Make speedbin discovery and assignment generation independent.
>
> This implicitly removes the bogus 0x80 / BIT(7) speed bin on A5xx,
> which has no representation in hardware whatshowever.
>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
> drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 34 --------------------
> drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 56 ---------------------------------
> drivers/gpu/drm/msm/adreno/adreno_gpu.c | 51 ++++++++++++++++++++++++++----
> drivers/gpu/drm/msm/adreno/adreno_gpu.h | 3 --
> 4 files changed, 45 insertions(+), 99 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> index c003f970189b..eed6a2eb1731 100644
> --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> @@ -1704,38 +1704,6 @@ 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);
> - }
> -
> - devm_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;
> @@ -1763,8 +1731,6 @@ struct msm_gpu *a5xx_gpu_init(struct drm_device *dev)
>
> a5xx_gpu->lm_leakage = 0x4E001A;
>
> - check_speed_bin(&pdev->dev);
> -
> nr_rings = 4;
>
> if (config->info->revn == 510)
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index 8ace096bb68c..f038e5f1fe59 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -2112,55 +2112,6 @@ static bool a6xx_progress(struct msm_gpu *gpu, struct msm_ringbuffer *ring)
> return progress;
> }
>
> -static u32 fuse_to_supp_hw(const struct adreno_info *info, u32 fuse)
> -{
> - if (!info->speedbins)
> - return UINT_MAX;
> -
> - for (int i = 0; info->speedbins[i].fuse != SHRT_MAX; i++)
> - if (info->speedbins[i].fuse == fuse)
> - return BIT(info->speedbins[i].speedbin);
> -
> - return UINT_MAX;
> -}
> -
> -static int a6xx_set_supported_hw(struct adreno_gpu *adreno_gpu,
> - struct device *dev,
> - const struct adreno_info *info)
> -{
> - u32 supp_hw;
> - u32 speedbin;
> - int ret;
> -
> - ret = adreno_read_speedbin(adreno_gpu, dev, &speedbin);
> - /*
> - * -ENOENT means that the platform doesn't support speedbin which is
> - * fine
> - */
> - if (ret == -ENOENT) {
> - return 0;
> - } else if (ret) {
> - dev_err_probe(dev, ret,
> - "failed to read speed-bin. Some OPPs may not be supported by hardware\n");
> - return ret;
> - }
> -
> - supp_hw = fuse_to_supp_hw(info, speedbin);
> -
> - if (supp_hw == UINT_MAX) {
> - DRM_DEV_ERROR(dev,
> - "missing support for speed-bin: %u. Some OPPs may not be supported by hardware\n",
> - speedbin);
> - supp_hw = BIT(0); /* Default */
> - }
> -
> - ret = devm_pm_opp_set_supported_hw(dev, &supp_hw, 1);
> - if (ret)
> - return ret;
> -
> - return 0;
> -}
> -
> static const struct adreno_gpu_funcs funcs = {
> .base = {
> .get_param = adreno_get_param,
> @@ -2292,13 +2243,6 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>
> a6xx_llc_slices_init(pdev, a6xx_gpu, is_a7xx);
>
> - ret = a6xx_set_supported_hw(adreno_gpu, &pdev->dev, config->info);
> - if (ret) {
> - a6xx_llc_slices_destroy(a6xx_gpu);
> - kfree(a6xx_gpu);
> - return ERR_PTR(ret);
> - }
> -
> if (is_a7xx)
> ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs_a7xx, 1);
> else if (adreno_has_gmu_wrapper(adreno_gpu))
> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> index 6ffd02f38499..5b4205b76cdf 100644
> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> @@ -1064,8 +1064,8 @@ void adreno_gpu_ocmem_cleanup(struct adreno_ocmem *adreno_ocmem)
> adreno_ocmem->hdl);
> }
>
> -int adreno_read_speedbin(struct adreno_gpu *adreno_gpu,
> - struct device *dev, u32 *fuse)
> +static int adreno_read_speedbin(struct adreno_gpu *adreno_gpu,
> + struct device *dev, u32 *fuse)
> {
> u32 fcode;
> int ret;
> @@ -1099,6 +1099,46 @@ int adreno_read_speedbin(struct adreno_gpu *adreno_gpu,
> return 0;
> }
>
> +#define ADRENO_SPEEDBIN_FUSE_NODATA 0xFFFF /* Made-up large value, expected by mesa */
> +static int adreno_set_speedbin(struct adreno_gpu *adreno_gpu, struct device *dev)
> +{
> + const struct adreno_info *info = adreno_gpu->info;
> + u32 fuse = ADRENO_SPEEDBIN_FUSE_NODATA;
> + u32 supp_hw = UINT_MAX;
> + int ret;
> +
> + /* No speedbins defined for this GPU SKU => allow all defined OPPs */
> + if (!info->speedbins) {
> + adreno_gpu->speedbin = ADRENO_SPEEDBIN_FUSE_NODATA;
> + return devm_pm_opp_set_supported_hw(dev, &supp_hw, 1);
> + }
> +
> + /*
> + * If a real error (not counting older devicetrees having no nvmem references)
> + * occurs when trying to get the fuse value, bail out.
> + */
> + ret = adreno_read_speedbin(adreno_gpu, dev, &fuse);
> + if (ret) {
> + return ret;
> + } else if (fuse == ADRENO_SPEEDBIN_FUSE_NODATA) {
> + /* The info struct has speedbin data, but the DT is too old => allow all OPPs */
> + DRM_DEV_INFO(dev, "No GPU speed bin fuse, please update your device tree\n");
> + return devm_pm_opp_set_supported_hw(dev, &supp_hw, 1);
> + }
> +
> + adreno_gpu->speedbin = fuse;
> +
> + /* Traverse the known speedbins */
> + for (int i = 0; info->speedbins[i].fuse != SHRT_MAX; i++) {
> + if (info->speedbins[i].fuse == fuse) {
> + supp_hw = BIT(info->speedbins[i].speedbin);
> + return devm_pm_opp_set_supported_hw(dev, &supp_hw, 1);
Can we do this if supp_hw property is not present in opp table?
-Akhil
> + }
> + }
> +
> + return dev_err_probe(dev, -EINVAL, "Unknown speed bin fuse value: 0x%x\n", fuse);
> +}
> +
> 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)
> @@ -1108,7 +1148,6 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
> struct msm_gpu_config adreno_gpu_config = { 0 };
> struct msm_gpu *gpu = &adreno_gpu->base;
> const char *gpu_name;
> - u32 speedbin;
> int ret;
>
> adreno_gpu->funcs = funcs;
> @@ -1135,9 +1174,9 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
> devm_pm_opp_set_clkname(dev, "core");
> }
>
> - if (adreno_read_speedbin(adreno_gpu, dev, &speedbin) || !speedbin)
> - speedbin = 0xffff;
> - adreno_gpu->speedbin = speedbin;
> + ret = adreno_set_speedbin(adreno_gpu, dev);
> + if (ret)
> + return ret;
>
> gpu_name = devm_kasprintf(dev, GFP_KERNEL, "%"ADRENO_CHIPID_FMT,
> ADRENO_CHIPID_ARGS(config->chip_id));
> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> index 563c08b44624..dc579f7afdc7 100644
> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> @@ -549,9 +549,6 @@ int adreno_fault_handler(struct msm_gpu *gpu, unsigned long iova, int flags,
> struct adreno_smmu_fault_info *info, const char *block,
> u32 scratch[4]);
>
> -int adreno_read_speedbin(struct adreno_gpu *adreno_gpu,
> - struct device *dev, u32 *speedbin);
> -
> /*
> * For a5xx and a6xx targets load the zap shader that is used to pull the GPU
> * out of secure mode
>
> --
> 2.45.2
>
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