drm/msm/dp: "inline" dp_ctrl_set_clock_rate("ctrl_link")

"ctrl_link" is the clock from DP_CTRL_PM module. The result of setting
the rate for it would be a call to dev_pm_opp_set_rate(). Instead of
saving the rate inside struct dss_module_power, call the
devm_pm_opp_set_rate() directly.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/474712/
Link: https://lore.kernel.org/r/20220217055529.499829-3-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/dp/dp_ctrl.c

@@ -1349,12 +1349,11 @@ static int dp_ctrl_enable_mainlink_clocks(struct dp_ctrl_private *ctrl)
 	opts_dp->lanes = ctrl->link->link_params.num_lanes;
 	opts_dp->link_rate = ctrl->link->link_params.rate / 100;
 	opts_dp->ssc = drm_dp_max_downspread(dpcd);
-	dp_ctrl_set_clock_rate(ctrl, DP_CTRL_PM, "ctrl_link",
-					ctrl->link->link_params.rate * 1000);
 
 	phy_configure(phy, &dp_io->phy_opts);
 	phy_power_on(phy);
 
+	dev_pm_opp_set_rate(ctrl->dev, ctrl->link->link_params.rate * 1000);
 	ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, true);
 	if (ret)
 		DRM_ERROR("Unable to start link clocks. ret=%d\n", ret);
@@ -1462,6 +1461,7 @@ static int dp_ctrl_reinitialize_mainlink(struct dp_ctrl_private *ctrl)
 	 * link clock might have been adjusted as part of the
 	 * link maintenance.
 	 */
+	dev_pm_opp_set_rate(ctrl->dev, 0);
 	ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
 	if (ret) {
 		DRM_ERROR("Failed to disable clocks. ret=%d\n", ret);
@@ -1493,6 +1493,7 @@ static int dp_ctrl_deinitialize_mainlink(struct dp_ctrl_private *ctrl)
 
 	dp_catalog_ctrl_reset(ctrl->catalog);
 
+	dev_pm_opp_set_rate(ctrl->dev, 0);
 	ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
 	if (ret) {
 		DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
@@ -1929,6 +1930,7 @@ int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl)
 		}
 	}
 
+	dev_pm_opp_set_rate(ctrl->dev, 0);
 	ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
 	if (ret) {
 		DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
@@ -1997,6 +1999,7 @@ int dp_ctrl_off(struct dp_ctrl *dp_ctrl)
 	if (ret)
 		DRM_ERROR("Failed to disable pixel clocks. ret=%d\n", ret);
 
+	dev_pm_opp_set_rate(ctrl->dev, 0);
 	ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
 	if (ret) {
 		DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);

drivers/gpu/drm/msm/dp/dp_power.c

@@ -151,44 +151,13 @@ static int dp_power_clk_deinit(struct dp_power_private *power)
 	return 0;
 }
 
-static int dp_power_clk_set_link_rate(struct dp_power_private *power,
-			struct dss_clk *clk_arry, int num_clk, int enable)
-{
-	u32 rate;
-	int i, rc = 0;
-
-	for (i = 0; i < num_clk; i++) {
-		if (clk_arry[i].clk) {
-			if (clk_arry[i].type == DSS_CLK_PCLK) {
-				if (enable)
-					rate = clk_arry[i].rate;
-				else
-					rate = 0;
-
-				rc = dev_pm_opp_set_rate(power->dev, rate);
-				if (rc)
-					break;
-			}
-
-		}
-	}
-	return rc;
-}
-
 static int dp_power_clk_set_rate(struct dp_power_private *power,
 		enum dp_pm_type module, bool enable)
 {
 	int rc = 0;
 	struct dss_module_power *mp = &power->parser->mp[module];
 
-	if (module == DP_CTRL_PM) {
-		rc = dp_power_clk_set_link_rate(power, mp->clk_config, mp->num_clk, enable);
-		if (rc) {
-			DRM_ERROR("failed to set link clks rate\n");
-			return rc;
-		}
-	} else {
-
+	if (module != DP_CTRL_PM) {
 		if (enable) {
 			rc = msm_dss_clk_set_rate(mp->clk_config, mp->num_clk);
 			if (rc) {