Revert "drm/vc4: hdmi: Fix HSM clock too low on Pi4"

This reverts commit 3bc6a37f.

Commit 3bc6a37f ("drm/vc4: hdmi: Fix HSM clock too low on Pi4") was
introduced to work around an issue partly due to the clk-bcm2835 driver
on the RaspberryPi0-3.

Since we're not using that driver for our HDMI clocks, we can now revert
that inelegant solution.
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20230126-rpi-display-fw-clk-cleanup-v1-3-d646ff6fb842@cerno.techSigned-off-by: Maxime Ripard <maxime@cerno.tech>

drivers/gpu/drm/vc4/vc4_hdmi.c

@@ -3189,16 +3189,9 @@ static int vc4_hdmi_init_resources(struct drm_device *drm,
 		DRM_ERROR("Failed to get HDMI state machine clock\n");
 		return PTR_ERR(vc4_hdmi->hsm_clock);
 	}
-
 	vc4_hdmi->audio_clock = vc4_hdmi->hsm_clock;
 	vc4_hdmi->cec_clock = vc4_hdmi->hsm_clock;
 
-	vc4_hdmi->hsm_rpm_clock = devm_clk_get(dev, "hdmi");
-	if (IS_ERR(vc4_hdmi->hsm_rpm_clock)) {
-		DRM_ERROR("Failed to get HDMI state machine clock\n");
-		return PTR_ERR(vc4_hdmi->hsm_rpm_clock);
-	}
-
 	return 0;
 }
 
@@ -3281,12 +3274,6 @@ static int vc5_hdmi_init_resources(struct drm_device *drm,
 		return PTR_ERR(vc4_hdmi->hsm_clock);
 	}
 
-	vc4_hdmi->hsm_rpm_clock = devm_clk_get(dev, "hdmi");
-	if (IS_ERR(vc4_hdmi->hsm_rpm_clock)) {
-		DRM_ERROR("Failed to get HDMI state machine clock\n");
-		return PTR_ERR(vc4_hdmi->hsm_rpm_clock);
-	}
-
 	vc4_hdmi->pixel_bvb_clock = devm_clk_get(dev, "bvb");
 	if (IS_ERR(vc4_hdmi->pixel_bvb_clock)) {
 		DRM_ERROR("Failed to get pixel bvb clock\n");
@@ -3350,7 +3337,7 @@ static int vc4_hdmi_runtime_suspend(struct device *dev)
 {
 	struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
 
-	clk_disable_unprepare(vc4_hdmi->hsm_rpm_clock);
+	clk_disable_unprepare(vc4_hdmi->hsm_clock);
 
 	return 0;
 }
@@ -3368,11 +3355,11 @@ static int vc4_hdmi_runtime_resume(struct device *dev)
 	 * its frequency while the power domain is active so that it
 	 * keeps its rate.
 	 */
-	ret = clk_set_min_rate(vc4_hdmi->hsm_rpm_clock, HSM_MIN_CLOCK_FREQ);
+	ret = clk_set_min_rate(vc4_hdmi->hsm_clock, HSM_MIN_CLOCK_FREQ);
 	if (ret)
 		return ret;
 
-	ret = clk_prepare_enable(vc4_hdmi->hsm_rpm_clock);
+	ret = clk_prepare_enable(vc4_hdmi->hsm_clock);
 	if (ret)
 		return ret;
 
@@ -3385,7 +3372,7 @@ static int vc4_hdmi_runtime_resume(struct device *dev)
 	 * case, it will lead to a silent CPU stall. Let's make sure we
 	 * prevent such a case.
 	 */
-	rate = clk_get_rate(vc4_hdmi->hsm_rpm_clock);
+	rate = clk_get_rate(vc4_hdmi->hsm_clock);
 	if (!rate) {
 		ret = -EINVAL;
 		goto err_disable_clk;

drivers/gpu/drm/vc4/vc4_hdmi.h

@@ -164,7 +164,6 @@ struct vc4_hdmi {
 	struct clk *cec_clock;
 	struct clk *pixel_clock;
 	struct clk *hsm_clock;
-	struct clk *hsm_rpm_clock;
 	struct clk *audio_clock;
 	struct clk *pixel_bvb_clock;