drm/exynos: rework fimc clocks handling

The clocks handling is refactored and a "mux" clock handling is
added to account for changes in the clocks driver. After switching
to the common clock framework the sclk_fimc clock is now split
into two clocks: a gate and a mux clock. In order to retain the
exisiting functionality two additional consumer clocks are passed
to the driver from device tree: "mux" and "parent". Then the driver
sets "parent" clock as a parent clock of the "mux" clock. These two
additional clocks are optional, and should go away when there is a
standard way of setting up parent clocks on DT platforms.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimc.c b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
index d812c57..2cce97d 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_fimc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimc.c
@@ -76,6 +76,27 @@ enum fimc_wb {
        FIMC_WB_B,
 };
 
+enum {
+       FIMC_CLK_LCLK,
+       FIMC_CLK_GATE,
+       FIMC_CLK_WB_A,
+       FIMC_CLK_WB_B,
+       FIMC_CLK_MUX,
+       FIMC_CLK_PARENT,
+       FIMC_CLKS_MAX
+};
+
+static const char * const fimc_clock_names[] = {
+       [FIMC_CLK_LCLK]   = "sclk_fimc",
+       [FIMC_CLK_GATE]   = "fimc",
+       [FIMC_CLK_WB_A]   = "pxl_async0",
+       [FIMC_CLK_WB_B]   = "pxl_async1",
+       [FIMC_CLK_MUX]    = "mux",
+       [FIMC_CLK_PARENT] = "parent",
+};
+
+#define FIMC_DEFAULT_LCLK_FREQUENCY 133000000UL
+
 /*
  * A structure of scaler.
  *
@@ -134,13 +155,9 @@ struct fimc_driverdata {
  * @regs_res: register resources.
  * @regs: memory mapped io registers.
  * @lock: locking of operations.
- * @sclk_fimc_clk: fimc source clock.
- * @fimc_clk: fimc clock.
- * @wb_clk: writeback a clock.
- * @wb_b_clk: writeback b clock.
+ * @clocks: fimc clocks.
+ * @clk_frequency: LCLK clock frequency.
  * @sc: scaler infomations.
- * @odr: ordering of YUV.
- * @ver: fimc version.
  * @pol: porarity of writeback.
  * @id: fimc id.
  * @irq: irq number.
@@ -151,10 +168,8 @@ struct fimc_context {
        struct resource *regs_res;
        void __iomem    *regs;
        struct mutex    lock;
-       struct clk      *sclk_fimc_clk;
-       struct clk      *fimc_clk;
-       struct clk      *wb_clk;
-       struct clk      *wb_b_clk;
+       struct clk      *clocks[FIMC_CLKS_MAX];
+       u32             clk_frequency;
        struct fimc_scaler      sc;
        struct fimc_driverdata  *ddata;
        struct exynos_drm_ipp_pol       pol;
@@ -1301,14 +1316,12 @@ static int fimc_clk_ctrl(struct fimc_context *ctx, bool enable)
        DRM_DEBUG_KMS("%s:enable[%d]\n", __func__, enable);
 
        if (enable) {
-               clk_enable(ctx->sclk_fimc_clk);
-               clk_enable(ctx->fimc_clk);
-               clk_enable(ctx->wb_clk);
+               clk_prepare_enable(ctx->clocks[FIMC_CLK_GATE]);
+               clk_prepare_enable(ctx->clocks[FIMC_CLK_WB_A]);
                ctx->suspended = false;
        } else {
-               clk_disable(ctx->sclk_fimc_clk);
-               clk_disable(ctx->fimc_clk);
-               clk_disable(ctx->wb_clk);
+               clk_disable_unprepare(ctx->clocks[FIMC_CLK_GATE]);
+               clk_disable_unprepare(ctx->clocks[FIMC_CLK_WB_A]);
                ctx->suspended = true;
        }
 
@@ -1713,11 +1726,70 @@ static void fimc_ippdrv_stop(struct device *dev, enum drm_exynos_ipp_cmd cmd)
        fimc_write(cfg, EXYNOS_CIGCTRL);
 }
 
+static void fimc_put_clocks(struct fimc_context *ctx)
+{
+       int i;
+
+       for (i = 0; i < FIMC_CLKS_MAX; i++) {
+               if (IS_ERR(ctx->clocks[i]))
+                       continue;
+               clk_put(ctx->clocks[i]);
+               ctx->clocks[i] = ERR_PTR(-EINVAL);
+       }
+}
+
+static int fimc_setup_clocks(struct fimc_context *ctx)
+{
+       struct device *fimc_dev = ctx->ippdrv.dev;
+       struct device *dev;
+       int ret, i;
+
+       for (i = 0; i < FIMC_CLKS_MAX; i++)
+               ctx->clocks[i] = ERR_PTR(-EINVAL);
+
+       for (i = 0; i < FIMC_CLKS_MAX; i++) {
+               if (i == FIMC_CLK_WB_A || i == FIMC_CLK_WB_B)
+                       dev = fimc_dev->parent;
+               else
+                       dev = fimc_dev;
+
+               ctx->clocks[i] = clk_get(dev, fimc_clock_names[i]);
+               if (IS_ERR(ctx->clocks[i])) {
+                       if (i >= FIMC_CLK_MUX)
+                               break;
+                       ret = PTR_ERR(ctx->clocks[i]);
+                       dev_err(fimc_dev, "failed to get clock: %s\n",
+                                               fimc_clock_names[i]);
+                       goto e_clk_free;
+               }
+       }
+
+       /* Optional FIMC LCLK parent clock setting */
+       if (!IS_ERR(ctx->clocks[FIMC_CLK_PARENT])) {
+               ret = clk_set_parent(ctx->clocks[FIMC_CLK_MUX],
+                                    ctx->clocks[FIMC_CLK_PARENT]);
+               if (ret < 0) {
+                       dev_err(fimc_dev, "failed to set parent.\n");
+                       goto e_clk_free;
+               }
+       }
+
+       ret = clk_set_rate(ctx->clocks[FIMC_CLK_LCLK], ctx->clk_frequency);
+       if (ret < 0)
+               goto e_clk_free;
+
+       ret = clk_prepare_enable(ctx->clocks[FIMC_CLK_LCLK]);
+       if (!ret)
+               return ret;
+e_clk_free:
+       fimc_put_clocks(ctx);
+       return ret;
+}
+
 static int fimc_probe(struct platform_device *pdev)
 {
        struct device *dev = &pdev->dev;
        struct fimc_context *ctx;
-       struct clk      *parent_clk;
        struct resource *res;
        struct exynos_drm_ippdrv *ippdrv;
        struct exynos_drm_fimc_pdata *pdata;
@@ -1734,55 +1806,6 @@ static int fimc_probe(struct platform_device *pdev)
        if (!ctx)
                return -ENOMEM;
 
-       ddata = (struct fimc_driverdata *)
-               platform_get_device_id(pdev)->driver_data;
-
-       /* clock control */
-       ctx->sclk_fimc_clk = devm_clk_get(dev, "sclk_fimc");
-       if (IS_ERR(ctx->sclk_fimc_clk)) {
-               dev_err(dev, "failed to get src fimc clock.\n");
-               return PTR_ERR(ctx->sclk_fimc_clk);
-       }
-       clk_enable(ctx->sclk_fimc_clk);
-
-       ctx->fimc_clk = devm_clk_get(dev, "fimc");
-       if (IS_ERR(ctx->fimc_clk)) {
-               dev_err(dev, "failed to get fimc clock.\n");
-               clk_disable(ctx->sclk_fimc_clk);
-               return PTR_ERR(ctx->fimc_clk);
-       }
-
-       ctx->wb_clk = devm_clk_get(dev, "pxl_async0");
-       if (IS_ERR(ctx->wb_clk)) {
-               dev_err(dev, "failed to get writeback a clock.\n");
-               clk_disable(ctx->sclk_fimc_clk);
-               return PTR_ERR(ctx->wb_clk);
-       }
-
-       ctx->wb_b_clk = devm_clk_get(dev, "pxl_async1");
-       if (IS_ERR(ctx->wb_b_clk)) {
-               dev_err(dev, "failed to get writeback b clock.\n");
-               clk_disable(ctx->sclk_fimc_clk);
-               return PTR_ERR(ctx->wb_b_clk);
-       }
-
-       parent_clk = devm_clk_get(dev, ddata->parent_clk);
-
-       if (IS_ERR(parent_clk)) {
-               dev_err(dev, "failed to get parent clock.\n");
-               clk_disable(ctx->sclk_fimc_clk);
-               return PTR_ERR(parent_clk);
-       }
-
-       if (clk_set_parent(ctx->sclk_fimc_clk, parent_clk)) {
-               dev_err(dev, "failed to set parent.\n");
-               clk_disable(ctx->sclk_fimc_clk);
-               return -EINVAL;
-       }
-
-       devm_clk_put(dev, parent_clk);
-       clk_set_rate(ctx->sclk_fimc_clk, pdata->clk_rate);
-
        /* resource memory */
        ctx->regs_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        ctx->regs = devm_ioremap_resource(dev, ctx->regs_res);
@@ -1804,6 +1827,9 @@ static int fimc_probe(struct platform_device *pdev)
                return ret;
        }
 
+       ret = fimc_setup_clocks(ctx);
+       if (ret < 0)
+               goto err_free_irq;
        /* context initailization */
        ctx->id = pdev->id;
        ctx->pol = pdata->pol;
@@ -1820,7 +1846,7 @@ static int fimc_probe(struct platform_device *pdev)
        ret = fimc_init_prop_list(ippdrv);
        if (ret < 0) {
                dev_err(dev, "failed to init property list.\n");
-               goto err_get_irq;
+               goto err_put_clk;
        }
 
        DRM_DEBUG_KMS("%s:id[%d]ippdrv[0x%x]\n", __func__, ctx->id,
@@ -1835,16 +1861,18 @@ static int fimc_probe(struct platform_device *pdev)
        ret = exynos_drm_ippdrv_register(ippdrv);
        if (ret < 0) {
                dev_err(dev, "failed to register drm fimc device.\n");
-               goto err_ippdrv_register;
+               goto err_pm_dis;
        }
 
        dev_info(&pdev->dev, "drm fimc registered successfully.\n");
 
        return 0;
 
-err_ippdrv_register:
+err_pm_dis:
        pm_runtime_disable(dev);
-err_get_irq:
+err_put_clk:
+       fimc_put_clocks(ctx);
+err_free_irq:
        free_irq(ctx->irq, ctx);
 
        return ret;
@@ -1859,6 +1887,7 @@ static int fimc_remove(struct platform_device *pdev)
        exynos_drm_ippdrv_unregister(ippdrv);
        mutex_destroy(&ctx->lock);
 
+       fimc_put_clocks(ctx);
        pm_runtime_set_suspended(dev);
        pm_runtime_disable(dev);