drm/komeda: Unify mclk/pclk/pipeline->aclk to one MCLK

Current komeda driver uses three dedicated clks for a specific purpose:
- mclk: main engine clock
- pclk: APB clock
- pipeline->aclk: AXI clock.

But per spec the komeda HW only has three input clks:
- ACLK: used for AXI masters, APB slave and most pipeline processing
- PXCLK for pipeline 0: output pixel clock for pipeline 0
- PXCLK for pipeline 1: output pixel clock for pipeline 1

So one ACLK is enough, no need to split it to three mclk/pclk/axiclk.
drop pclk/pipeline->axiclk. but only keep one mclk in komeda driver.

Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
index 24a9613..04bdd7e 100644 (file)
--- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
@@ -123,9 +123,6 @@ komeda_crtc_prepare(struct komeda_crtc *kcrtc)
                        DRM_ERROR("failed to enable mclk.\n");
        }
 
-       err = clk_prepare_enable(master->aclk);
-       if (err)
-               DRM_ERROR("failed to enable axi clk for pipe%d.\n", master->id);
        err = clk_set_rate(master->pxlclk, pxlclk_rate);
        if (err)
                DRM_ERROR("failed to set pxlclk for pipe%d\n", master->id);
@@ -166,7 +163,6 @@ komeda_crtc_unprepare(struct komeda_crtc *kcrtc)
        mdev->dpmode = new_mode;
 
        clk_disable_unprepare(master->pxlclk);
-       clk_disable_unprepare(master->aclk);
        if (new_mode == KOMEDA_MODE_INACTIVE)
                clk_disable_unprepare(mdev->mclk);
 
@@ -362,13 +358,6 @@ komeda_crtc_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *m)
                return MODE_CLOCK_HIGH;
        }
 
-       if (clk_round_rate(master->aclk, mode_clk) < pxlclk) {
-               DRM_DEBUG_ATOMIC("aclk can't satisfy the requirement of %s-clk: %ld.\n",
-                                m->name, pxlclk);
-
-               return MODE_CLOCK_HIGH;
-       }
-
        return MODE_OK;
 }
 

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
index 7bb5f88..fd07415 100644 (file)
--- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
@@ -116,13 +116,6 @@ static int komeda_parse_pipe_dt(struct komeda_dev *mdev, struct device_node *np)
 
        pipe = mdev->pipelines[pipe_id];
 
-       clk = of_clk_get_by_name(np, "aclk");
-       if (IS_ERR(clk)) {
-               DRM_ERROR("get aclk for pipeline %d failed!\n", pipe_id);
-               return PTR_ERR(clk);
-       }
-       pipe->aclk = clk;
-
        clk = of_clk_get_by_name(np, "pxclk");
        if (IS_ERR(clk)) {
                DRM_ERROR("get pxclk for pipeline %d failed!\n", pipe_id);
@@ -145,14 +138,8 @@ static int komeda_parse_dt(struct device *dev, struct komeda_dev *mdev)
 {
        struct platform_device *pdev = to_platform_device(dev);
        struct device_node *child, *np = dev->of_node;
-       struct clk *clk;
        int ret;
 
-       clk = devm_clk_get(dev, "mclk");
-       if (IS_ERR(clk))
-               return PTR_ERR(clk);
-
-       mdev->mclk = clk;
        mdev->irq  = platform_get_irq(pdev, 0);
        if (mdev->irq < 0) {
                DRM_ERROR("could not get IRQ number.\n");
@@ -206,16 +193,15 @@ struct komeda_dev *komeda_dev_create(struct device *dev)
                goto err_cleanup;
        }
 
-       mdev->pclk = devm_clk_get(dev, "pclk");
-       if (IS_ERR(mdev->pclk)) {
-               DRM_ERROR("Get APB clk failed.\n");
-               err = PTR_ERR(mdev->pclk);
-               mdev->pclk = NULL;
+       mdev->mclk = devm_clk_get(dev, "mclk");
+       if (IS_ERR(mdev->mclk)) {
+               DRM_ERROR("Get engine clk failed.\n");
+               err = PTR_ERR(mdev->mclk);
+               mdev->mclk = NULL;
                goto err_cleanup;
        }
 
-       /* Enable APB clock to access the registers */
-       clk_prepare_enable(mdev->pclk);
+       clk_prepare_enable(mdev->mclk);
 
        mdev->funcs = product->identify(mdev->reg_base, &mdev->chip);
        if (!komeda_product_match(mdev, product->product_id)) {
@@ -315,15 +301,10 @@ void komeda_dev_destroy(struct komeda_dev *mdev)
        }
 
        if (mdev->mclk) {
+               clk_disable_unprepare(mdev->mclk);
                devm_clk_put(dev, mdev->mclk);
                mdev->mclk = NULL;
        }
 
-       if (mdev->pclk) {
-               clk_disable_unprepare(mdev->pclk);
-               devm_clk_put(dev, mdev->pclk);
-               mdev->pclk = NULL;
-       }
-
        devm_kfree(dev, mdev);
 }

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
index 5126879..5feaed2 100644 (file)
--- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h
@@ -160,8 +160,6 @@ struct komeda_dev {
        struct komeda_chip_info chip;
        /** @fmt_tbl: initialized by &komeda_dev_funcs->init_format_table */
        struct komeda_format_caps_table fmt_tbl;
-       /** @pclk: APB clock for register access */
-       struct clk *pclk;
        /** @mclk: HW main engine clk */
        struct clk *mclk;
 

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c
index 9624858..f4882c1 100644 (file)
--- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c
@@ -53,7 +53,6 @@ void komeda_pipeline_destroy(struct komeda_dev *mdev,
        }
 
        clk_put(pipe->pxlclk);
-       clk_put(pipe->aclk);
 
        of_node_put(pipe->of_output_dev);
        of_node_put(pipe->of_output_port);

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
index 0e334f1..04a300f 100644 (file)
--- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
@@ -343,8 +343,6 @@ struct komeda_pipeline {
        struct komeda_dev *mdev;
        /** @pxlclk: pixel clock */
        struct clk *pxlclk;
-       /** @aclk: AXI clock */
-       struct clk *aclk;
        /** @id: pipeline id */
        int id;
        /** @avail_comps: available components mask of pipeline */