drm/msm/mdp4: add mdp axi clk

Downstream kernel holds this clk via a fake-parent relationship.
Upstream clock framework requires that we hold it explicitly.

Signed-off-by: Rob Clark <robdclark@gmail.com>

2 files changed, 12 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
index 5a7bfd452252..4a08655b2bfc 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
@@ -176,6 +176,8 @@ int mdp4_disable(struct mdp4_kms *mdp4_kms)
         if (mdp4_kms->pclk)
                 clk_disable_unprepare(mdp4_kms->pclk);
         clk_disable_unprepare(mdp4_kms->lut_clk);
+        if (mdp4_kms->axi_clk)
+                clk_disable_unprepare(mdp4_kms->axi_clk);
 
         return 0;
 }
@@ -188,6 +190,8 @@ int mdp4_enable(struct mdp4_kms *mdp4_kms)
         if (mdp4_kms->pclk)
                 clk_prepare_enable(mdp4_kms->pclk);
         clk_prepare_enable(mdp4_kms->lut_clk);
+        if (mdp4_kms->axi_clk)
+                clk_prepare_enable(mdp4_kms->axi_clk);
 
         return 0;
 }
@@ -335,6 +339,13 @@ struct msm_kms *mdp4_kms_init(struct drm_device *dev)
                 goto fail;
         }
 
+        mdp4_kms->axi_clk = devm_clk_get(&pdev->dev, "mdp_axi_clk");
+        if (IS_ERR(mdp4_kms->axi_clk)) {
+                dev_err(dev->dev, "failed to get axi_clk\n");
+                ret = PTR_ERR(mdp4_kms->axi_clk);
+                goto fail;
+        }
+
         clk_set_rate(mdp4_kms->clk, config->max_clk);
         clk_set_rate(mdp4_kms->lut_clk, config->max_clk);
 
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h
index 715520c54cde..3225da804c61 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h
@@ -42,6 +42,7 @@ struct mdp4_kms {
         struct clk *clk;
         struct clk *pclk;
         struct clk *lut_clk;
+        struct clk *axi_clk;
 
         struct mdp_irq error_handler;