drm: kirin: Dynamically allocate the hw_ctx

As part of refactoring the kirin driver to better support
different hardware revisions, this patch modifies the
initialization function to dynamically allocate the ade_hw_ctx
structure previously kept as part of struct ade_data.

This is done so that later we can have the hw_ctx point to
hardware revision specific ctx structures.

Cc: Rongrong Zou <zourongrong@gmail.com>
Cc: Xinliang Liu <z.liuxinliang@hisilicon.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel <dri-devel@lists.freedesktop.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Xinliang Liu <z.liuxinliang@hisilicon.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Xu YiPing <xuyiping@hisilicon.com>
[jstultz: reworded commit message]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190820230626.23253-9-john.stultz@linaro.org

drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c

@@ -72,7 +72,7 @@ struct kirin_plane {
 struct ade_data {
 	struct kirin_crtc crtc;
 	struct kirin_plane planes[ADE_CH_NUM];
-	struct ade_hw_ctx ctx;
+	struct ade_hw_ctx *hw_ctx;
 };
 
 /* ade-format info: */
@@ -951,55 +951,62 @@ static int ade_plane_init(struct drm_device *dev, struct kirin_plane *kplane,
 	return 0;
 }
 
-static int ade_dts_parse(struct platform_device *pdev, struct ade_hw_ctx *ctx)
+static void *ade_hw_ctx_alloc(struct platform_device *pdev)
 {
 	struct resource *res;
 	struct device *dev = &pdev->dev;
 	struct device_node *np = pdev->dev.of_node;
+	struct ade_hw_ctx *ctx = NULL;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx) {
+		DRM_ERROR("failed to alloc ade_hw_ctx\n");
+		return ERR_PTR(-ENOMEM);
+	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	ctx->base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(ctx->base)) {
 		DRM_ERROR("failed to remap ade io base\n");
-		return  PTR_ERR(ctx->base);
+		return ERR_PTR(-EIO);
 	}
 
 	ctx->reset = devm_reset_control_get(dev, NULL);
 	if (IS_ERR(ctx->reset))
-		return PTR_ERR(ctx->reset);
+		return ERR_PTR(-ENODEV);
 
 	ctx->noc_regmap =
 		syscon_regmap_lookup_by_phandle(np, "hisilicon,noc-syscon");
 	if (IS_ERR(ctx->noc_regmap)) {
 		DRM_ERROR("failed to get noc regmap\n");
-		return PTR_ERR(ctx->noc_regmap);
+		return ERR_PTR(-ENODEV);
 	}
 
 	ctx->irq = platform_get_irq(pdev, 0);
 	if (ctx->irq < 0) {
 		DRM_ERROR("failed to get irq\n");
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 	}
 
 	ctx->ade_core_clk = devm_clk_get(dev, "clk_ade_core");
 	if (IS_ERR(ctx->ade_core_clk)) {
 		DRM_ERROR("failed to parse clk ADE_CORE\n");
-		return PTR_ERR(ctx->ade_core_clk);
+		return ERR_PTR(-ENODEV);
 	}
 
 	ctx->media_noc_clk = devm_clk_get(dev, "clk_codec_jpeg");
 	if (IS_ERR(ctx->media_noc_clk)) {
 		DRM_ERROR("failed to parse clk CODEC_JPEG\n");
-		return PTR_ERR(ctx->media_noc_clk);
+		return ERR_PTR(-ENODEV);
 	}
 
 	ctx->ade_pix_clk = devm_clk_get(dev, "clk_ade_pix");
 	if (IS_ERR(ctx->ade_pix_clk)) {
 		DRM_ERROR("failed to parse clk ADE_PIX\n");
-		return PTR_ERR(ctx->ade_pix_clk);
+		return ERR_PTR(-ENODEV);
 	}
 
-	return 0;
+	return ctx;
 }
 
 static int ade_drm_init(struct platform_device *pdev)
@@ -1020,14 +1027,16 @@ static int ade_drm_init(struct platform_device *pdev)
 	}
 	platform_set_drvdata(pdev, ade);
 
-	ctx = &ade->ctx;
+	ctx = ade_hw_ctx_alloc(pdev);
+	if (IS_ERR(ctx)) {
+		DRM_ERROR("failed to initialize kirin_priv hw ctx\n");
+		return -EINVAL;
+	}
+	ade->hw_ctx = ctx;
+
 	kcrtc = &ade->crtc;
 	kcrtc->hw_ctx = ctx;
 
-	ret = ade_dts_parse(pdev, ctx);
-	if (ret)
-		return ret;
-
 	/*
 	 * plane init
 	 * TODO: Now only support primary plane, overlay planes