drm/msm/dsi: split clk rate setting and enable

Decouple enable and rate setting.  Prep work to handle bootloader
enabled display.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>

drivers/gpu/drm/msm/dsi/dsi.h

@@ -178,6 +178,8 @@ int msm_dsi_host_modeset_init(struct mipi_dsi_host *host,
 int msm_dsi_host_init(struct msm_dsi *msm_dsi);
 int msm_dsi_runtime_suspend(struct device *dev);
 int msm_dsi_runtime_resume(struct device *dev);
+int dsi_link_clk_set_rate_6g(struct msm_dsi_host *msm_host);
+int dsi_link_clk_set_rate_v2(struct msm_dsi_host *msm_host);
 int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host);
 int dsi_link_clk_enable_v2(struct msm_dsi_host *msm_host);
 void dsi_link_clk_disable_6g(struct msm_dsi_host *msm_host);

drivers/gpu/drm/msm/dsi/dsi_cfg.c

@@ -168,6 +168,7 @@ static const struct msm_dsi_config sdm845_dsi_cfg = {
 };
 
 static const struct msm_dsi_host_cfg_ops msm_dsi_v2_host_ops = {
+	.link_clk_set_rate = dsi_link_clk_set_rate_v2,
 	.link_clk_enable = dsi_link_clk_enable_v2,
 	.link_clk_disable = dsi_link_clk_disable_v2,
 	.clk_init_ver = dsi_clk_init_v2,
@@ -179,6 +180,7 @@ static const struct msm_dsi_host_cfg_ops msm_dsi_v2_host_ops = {
 };
 
 static const struct msm_dsi_host_cfg_ops msm_dsi_6g_host_ops = {
+	.link_clk_set_rate = dsi_link_clk_set_rate_6g,
 	.link_clk_enable = dsi_link_clk_enable_6g,
 	.link_clk_disable = dsi_link_clk_disable_6g,
 	.clk_init_ver = NULL,
@@ -190,6 +192,7 @@ static const struct msm_dsi_host_cfg_ops msm_dsi_6g_host_ops = {
 };
 
 static const struct msm_dsi_host_cfg_ops msm_dsi_6g_v2_host_ops = {
+	.link_clk_set_rate = dsi_link_clk_set_rate_6g,
 	.link_clk_enable = dsi_link_clk_enable_6g,
 	.link_clk_disable = dsi_link_clk_disable_6g,
 	.clk_init_ver = dsi_clk_init_6g_v2,

drivers/gpu/drm/msm/dsi/dsi_cfg.h

@@ -35,6 +35,7 @@ struct msm_dsi_config {
 };
 
 struct msm_dsi_host_cfg_ops {
+	int (*link_clk_set_rate)(struct msm_dsi_host *msm_host);
 	int (*link_clk_enable)(struct msm_dsi_host *msm_host);
 	void (*link_clk_disable)(struct msm_dsi_host *msm_host);
 	int (*clk_init_ver)(struct msm_dsi_host *msm_host);

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -505,7 +505,7 @@ int msm_dsi_runtime_resume(struct device *dev)
 	return dsi_bus_clk_enable(msm_host);
 }
 
-int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
+int dsi_link_clk_set_rate_6g(struct msm_dsi_host *msm_host)
 {
 	int ret;
 
@@ -515,13 +515,13 @@ int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
 	ret = clk_set_rate(msm_host->byte_clk, msm_host->byte_clk_rate);
 	if (ret) {
 		pr_err("%s: Failed to set rate byte clk, %d\n", __func__, ret);
-		goto error;
+		return ret;
 	}
 
 	ret = clk_set_rate(msm_host->pixel_clk, msm_host->pixel_clk_rate);
 	if (ret) {
 		pr_err("%s: Failed to set rate pixel clk, %d\n", __func__, ret);
-		goto error;
+		return ret;
 	}
 
 	if (msm_host->byte_intf_clk) {
@@ -530,10 +530,18 @@ int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
 		if (ret) {
 			pr_err("%s: Failed to set rate byte intf clk, %d\n",
 			       __func__, ret);
-			goto error;
+			return ret;
 		}
 	}
 
+	return 0;
+}
+
+
+int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
+{
+	int ret;
+
 	ret = clk_prepare_enable(msm_host->esc_clk);
 	if (ret) {
 		pr_err("%s: Failed to enable dsi esc clk\n", __func__);
@@ -573,7 +581,7 @@ int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
 	return ret;
 }
 
-int dsi_link_clk_enable_v2(struct msm_dsi_host *msm_host)
+int dsi_link_clk_set_rate_v2(struct msm_dsi_host *msm_host)
 {
 	int ret;
 
@@ -584,27 +592,34 @@ int dsi_link_clk_enable_v2(struct msm_dsi_host *msm_host)
 	ret = clk_set_rate(msm_host->byte_clk, msm_host->byte_clk_rate);
 	if (ret) {
 		pr_err("%s: Failed to set rate byte clk, %d\n", __func__, ret);
-		goto error;
+		return ret;
 	}
 
 	ret = clk_set_rate(msm_host->esc_clk, msm_host->esc_clk_rate);
 	if (ret) {
 		pr_err("%s: Failed to set rate esc clk, %d\n", __func__, ret);
-		goto error;
+		return ret;
 	}
 
 	ret = clk_set_rate(msm_host->src_clk, msm_host->src_clk_rate);
 	if (ret) {
 		pr_err("%s: Failed to set rate src clk, %d\n", __func__, ret);
-		goto error;
+		return ret;
 	}
 
 	ret = clk_set_rate(msm_host->pixel_clk, msm_host->pixel_clk_rate);
 	if (ret) {
 		pr_err("%s: Failed to set rate pixel clk, %d\n", __func__, ret);
-		goto error;
+		return ret;
 	}
 
+	return 0;
+}
+
+int dsi_link_clk_enable_v2(struct msm_dsi_host *msm_host)
+{
+	int ret;
+
 	ret = clk_prepare_enable(msm_host->byte_clk);
 	if (ret) {
 		pr_err("%s: Failed to enable dsi byte clk\n", __func__);
@@ -1996,6 +2011,7 @@ int msm_dsi_host_xfer_prepare(struct mipi_dsi_host *host,
 	 * mdp clock need to be enabled to receive dsi interrupt
 	 */
 	pm_runtime_get_sync(&msm_host->pdev->dev);
+	cfg_hnd->ops->link_clk_set_rate(msm_host);
 	cfg_hnd->ops->link_clk_enable(msm_host);
 
 	/* TODO: vote for bus bandwidth */
@@ -2344,7 +2360,9 @@ int msm_dsi_host_power_on(struct mipi_dsi_host *host,
 	}
 
 	pm_runtime_get_sync(&msm_host->pdev->dev);
-	ret = cfg_hnd->ops->link_clk_enable(msm_host);
+	ret = cfg_hnd->ops->link_clk_set_rate(msm_host);
+	if (!ret)
+		ret = cfg_hnd->ops->link_clk_enable(msm_host);
 	if (ret) {
 		pr_err("%s: failed to enable link clocks. ret=%d\n",
 		       __func__, ret);