Re: [PATCH 2/2] drm/msm: Fix duplicate gpu node in icc summary
From: Akhil P Oommen
Date: Tue Oct 20 2020 - 09:57:25 EST
On 10/19/2020 8:29 PM, Jordan Crouse wrote:
On Mon, Oct 19, 2020 at 06:49:18PM +0530, Akhil P Oommen wrote:
On targets with a6xx gpu, there is a duplicate gpu icc node listed in
the interconnect summary. On these targets, calling
This first sentence is confusing to me. I think the following few sentences do
a better job of explaining what you are trying to do.
I can just remove that line.
dev_pm_opp_of_add_table() api initializes the icc nodes for gpu indirectly.
So we should avoid using of_icc_get() api in the common probe path. To fix
this, we can move of_icc_get() to target specific code where it is
required.
Signed-off-by: Akhil P Oommen <akhilpo@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/msm/adreno/a3xx_gpu.c | 21 +++++++++++++++++++--
drivers/gpu/drm/msm/adreno/a4xx_gpu.c | 20 ++++++++++++++++++--
drivers/gpu/drm/msm/adreno/adreno_gpu.c | 29 +----------------------------
3 files changed, 38 insertions(+), 32 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
index f29c77d..93da668 100644
--- a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
@@ -519,6 +519,8 @@ struct msm_gpu *a3xx_gpu_init(struct drm_device *dev)
struct msm_gpu *gpu;
struct msm_drm_private *priv = dev->dev_private;
struct platform_device *pdev = priv->gpu_pdev;
+ struct icc_path *ocmem_icc_path;
+ struct icc_path *icc_path;
int ret;
if (!pdev) {
@@ -566,13 +568,28 @@ struct msm_gpu *a3xx_gpu_init(struct drm_device *dev)
goto fail;
}
+ icc_path = devm_of_icc_get(&pdev->dev, "gfx-mem");
+ ret = IS_ERR(icc_path);
+ if (ret)
+ goto fail;
+
+ ocmem_icc_path = devm_of_icc_get(&pdev->dev, "ocmem");
+ ret = IS_ERR(ocmem_icc_path);
+ if (ret) {
+ /* allow -ENODATA, ocmem icc is optional */
+ if (ret != -ENODATA)
+ goto fail;
+ ocmem_icc_path = NULL;
+ }
+
+
/*
* Set the ICC path to maximum speed for now by multiplying the fastest
* frequency by the bus width (8). We'll want to scale this later on to
* improve battery life.
*/
- icc_set_bw(gpu->icc_path, 0, Bps_to_icc(gpu->fast_rate) * 8);
- icc_set_bw(gpu->ocmem_icc_path, 0, Bps_to_icc(gpu->fast_rate) * 8);
+ icc_set_bw(icc_path, 0, Bps_to_icc(gpu->fast_rate) * 8);
+ icc_set_bw(ocmem_icc_path, 0, Bps_to_icc(gpu->fast_rate) * 8);
This seems reasonable but I hope we can get somebody to sign off on a real a3xx
part.
return gpu;
diff --git a/drivers/gpu/drm/msm/adreno/a4xx_gpu.c b/drivers/gpu/drm/msm/adreno/a4xx_gpu.c
index 2b93b33..c0be3a0 100644
--- a/drivers/gpu/drm/msm/adreno/a4xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a4xx_gpu.c
@@ -648,6 +648,8 @@ struct msm_gpu *a4xx_gpu_init(struct drm_device *dev)
struct msm_gpu *gpu;
struct msm_drm_private *priv = dev->dev_private;
struct platform_device *pdev = priv->gpu_pdev;
+ struct icc_path *ocmem_icc_path;
+ struct icc_path *icc_path;
int ret;
if (!pdev) {
@@ -694,13 +696,27 @@ struct msm_gpu *a4xx_gpu_init(struct drm_device *dev)
goto fail;
}
+ icc_path = devm_of_icc_get(&pdev->dev, "gfx-mem");
+ ret = IS_ERR(icc_path);
+ if (ret)
+ goto fail;
+
+ ocmem_icc_path = devm_of_icc_get(&pdev->dev, "ocmem");
+ ret = IS_ERR(ocmem_icc_path);
+ if (ret) {
+ /* allow -ENODATA, ocmem icc is optional */
+ if (ret != -ENODATA)
+ goto fail;
+ ocmem_icc_path = NULL;
+ }
+
/*
* Set the ICC path to maximum speed for now by multiplying the fastest
* frequency by the bus width (8). We'll want to scale this later on to
* improve battery life.
*/
- icc_set_bw(gpu->icc_path, 0, Bps_to_icc(gpu->fast_rate) * 8);
- icc_set_bw(gpu->ocmem_icc_path, 0, Bps_to_icc(gpu->fast_rate) * 8);
+ icc_set_bw(icc_path, 0, Bps_to_icc(gpu->fast_rate) * 8);
+ icc_set_bw(ocmem_icc_path, 0, Bps_to_icc(gpu->fast_rate) * 8);
Less confident we can find any 4xx fans to test this, but if a3xx works then so
should this (in theory).
return gpu;
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index fd8f491..6e3b820 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -920,35 +920,8 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
ret = msm_gpu_init(drm, pdev, &adreno_gpu->base, &funcs->base,
adreno_gpu->info->name, &adreno_gpu_config);
- if (ret)
- return ret;
-
- /*
- * The legacy case, before "interconnect-names", only has a
- * single interconnect path which is equivalent to "gfx-mem"
- */
- if (!of_find_property(dev->of_node, "interconnect-names", NULL)) {
- gpu->icc_path = of_icc_get(dev, NULL);
- } else {
- gpu->icc_path = of_icc_get(dev, "gfx-mem");
- gpu->ocmem_icc_path = of_icc_get(dev, "ocmem");
- }
- if (IS_ERR(gpu->icc_path)) {
- ret = PTR_ERR(gpu->icc_path);
- gpu->icc_path = NULL;
- return ret;
- }
-
- if (IS_ERR(gpu->ocmem_icc_path)) {
- ret = PTR_ERR(gpu->ocmem_icc_path);
- gpu->ocmem_icc_path = NULL;
- /* allow -ENODATA, ocmem icc is optional */
- if (ret != -ENODATA)
- return ret;
- }
-
- return 0;
+ return ret;
This could go even further:
return msm_gpu_init(...);
Yep, we can do that. Thanks for the feedback.
--Akhil
}
void adreno_gpu_cleanup(struct adreno_gpu *adreno_gpu)
--
2.7.4