WARN_ON was introduced by the below commit to catch runtime resumes
that are getting triggered before icc path was set.
"drm/msm/disp/dpu1: icc path needs to be set before dpu runtime resume"
For the targets where the bw scaling is not enabled, this WARN_ON is
a false alarm. Fix the WARN condition appropriately.
Reported-by: Steev Klimaszewski <st...@kali.org>
Signed-off-by: Kalyan Thota <kalya...@codeaurora.org>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 8 +++++---
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 9 +++++++++
drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 11 ++++++-----
3 files changed, 20 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index cab387f..0071a4d 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -294,6 +294,9 @@ static int dpu_kms_parse_data_bus_icc_path(struct dpu_kms
*dpu_kms)
struct icc_path *path1;
struct drm_device *dev = dpu_kms->dev;
+ if (!dpu_supports_bw_scaling(dev))
+ return 0;
+
path0 = of_icc_get(dev->dev, "mdp0-mem");
path1 = of_icc_get(dev->dev, "mdp1-mem");
@@ -934,8 +937,7 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
DPU_DEBUG("REG_DMA is not defined");
}
- if (of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss"))
- dpu_kms_parse_data_bus_icc_path(dpu_kms);
+ dpu_kms_parse_data_bus_icc_path(dpu_kms);
pm_runtime_get_sync(&dpu_kms->pdev->dev);
@@ -1198,7 +1200,7 @@ static int __maybe_unused dpu_runtime_resume(struct
device *dev)
ddev = dpu_kms->dev;
- WARN_ON(!(dpu_kms->num_paths));
+ WARN_ON((dpu_supports_bw_scaling(ddev) && !dpu_kms->num_paths));
/* Min vote of BW is required before turning on AXI clk */
for (i = 0; i < dpu_kms->num_paths; i++)
icc_set_bw(dpu_kms->path[i], 0, Bps_to_icc(MIN_IB_BW));
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index d6717d6..f7bcc0a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
@@ -154,6 +154,15 @@ struct vsync_info {
#define to_dpu_global_state(x) container_of(x, struct dpu_global_state, base)
+/**
+ * dpu_supports_bw_scaling: returns true for drivers that support bw scaling.
+ * @dev: Pointer to drm_device structure
+ */
+static inline int dpu_supports_bw_scaling(struct drm_device *dev)
+{
+ return of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss");
+}
+
/* Global private object state for tracking resources that are shared across
* multiple kms objects (planes/crtcs/etc).
*/
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index cd40788..8cd712c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -41,6 +41,9 @@ static int dpu_mdss_parse_data_bus_icc_path(struct drm_device
*dev,
struct icc_path *path0 = of_icc_get(dev->dev, "mdp0-mem");
struct icc_path *path1 = of_icc_get(dev->dev, "mdp1-mem");
+ if (dpu_supports_bw_scaling(dev))
+ return 0;
+
if (IS_ERR_OR_NULL(path0))
return PTR_ERR_OR_ZERO(path0);
@@ -276,11 +279,9 @@ int dpu_mdss_init(struct drm_device *dev)
DRM_DEBUG("mapped mdss address space @%pK\n", dpu_mdss->mmio);
- if (!of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss")) {
- ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
- if (ret)
- return ret;
- }
+ ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
+ if (ret)
+ return ret;
mp = &dpu_mdss->mp;
ret = msm_dss_parse_clock(pdev, mp);
--
2.7.4
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