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From: Maxime Ripard <maxime@cerno.tech>
To: Mike Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>
Cc: linux-clk@vger.kernel.org, dri-devel@lists.freedesktop.org,
	Dave Stevenson <dave.stevenson@raspberrypi.com>,
	Phil Elwell <phil@raspberrypi.com>,
	Tim Gover <tim.gover@raspberrypi.com>,
	Dom Cobley <dom@raspberrypi.com>,
	Maxime Ripard <maxime@cerno.tech>
Subject: [PATCH v3 09/10] drm/vc4: Add logging and comments
Date: Thu, 20 Jan 2022 15:34:16 +0100	[thread overview]
Message-ID: <20220120143417.543744-10-maxime@cerno.tech> (raw)
In-Reply-To: <20220120143417.543744-1-maxime@cerno.tech>

The HVS core clock isn't really obvious, so let's add a bunch more
comments and some logging for easier debugging.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_kms.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
index 24de29bc1cda..6fe03fc17d73 100644
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -389,8 +389,15 @@ static void vc4_atomic_commit_tail(struct drm_atomic_state *state)
 						500000000,
 						new_hvs_state->core_clock_rate);
 
+		drm_dbg(dev, "Raising the core clock at %lu Hz\n", core_rate);
+
+		/*
+		 * Do a temporary request on the core clock during the
+		 * modeset.
+		 */
 		clk_set_min_rate(hvs->core_clk, core_rate);
 	}
+
 	drm_atomic_helper_commit_modeset_disables(dev, state);
 
 	vc4_ctm_commit(vc4, state);
@@ -416,6 +423,10 @@ static void vc4_atomic_commit_tail(struct drm_atomic_state *state)
 		drm_dbg(dev, "Running the core clock at %lu Hz\n",
 			new_hvs_state->core_clock_rate);
 
+		/*
+		 * Request a clock rate based on the current HVS
+		 * requirements.
+		 */
 		clk_set_min_rate(hvs->core_clk, new_hvs_state->core_clock_rate);
 	}
 }
-- 
2.34.1


WARNING: multiple messages have this Message-ID (diff)
From: Maxime Ripard <maxime@cerno.tech>
To: Mike Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>
Cc: Dom Cobley <dom@raspberrypi.com>,
	Tim Gover <tim.gover@raspberrypi.com>,
	Dave Stevenson <dave.stevenson@raspberrypi.com>,
	dri-devel@lists.freedesktop.org, linux-clk@vger.kernel.org,
	Maxime Ripard <maxime@cerno.tech>,
	Phil Elwell <phil@raspberrypi.com>
Subject: [PATCH v3 09/10] drm/vc4: Add logging and comments
Date: Thu, 20 Jan 2022 15:34:16 +0100	[thread overview]
Message-ID: <20220120143417.543744-10-maxime@cerno.tech> (raw)
In-Reply-To: <20220120143417.543744-1-maxime@cerno.tech>

The HVS core clock isn't really obvious, so let's add a bunch more
comments and some logging for easier debugging.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_kms.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
index 24de29bc1cda..6fe03fc17d73 100644
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -389,8 +389,15 @@ static void vc4_atomic_commit_tail(struct drm_atomic_state *state)
 						500000000,
 						new_hvs_state->core_clock_rate);
 
+		drm_dbg(dev, "Raising the core clock at %lu Hz\n", core_rate);
+
+		/*
+		 * Do a temporary request on the core clock during the
+		 * modeset.
+		 */
 		clk_set_min_rate(hvs->core_clk, core_rate);
 	}
+
 	drm_atomic_helper_commit_modeset_disables(dev, state);
 
 	vc4_ctm_commit(vc4, state);
@@ -416,6 +423,10 @@ static void vc4_atomic_commit_tail(struct drm_atomic_state *state)
 		drm_dbg(dev, "Running the core clock at %lu Hz\n",
 			new_hvs_state->core_clock_rate);
 
+		/*
+		 * Request a clock rate based on the current HVS
+		 * requirements.
+		 */
 		clk_set_min_rate(hvs->core_clk, new_hvs_state->core_clock_rate);
 	}
 }
-- 
2.34.1


  parent reply	other threads:[~2022-01-20 14:34 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-20 14:34 [PATCH v3 00/10] clk: Improve clock range handling Maxime Ripard
2022-01-20 14:34 ` Maxime Ripard
2022-01-20 14:34 ` [PATCH v3 01/10] clk: Add Kunit tests for rate Maxime Ripard
2022-01-20 14:34   ` Maxime Ripard
2022-01-20 21:31   ` Stephen Boyd
2022-01-20 21:31     ` Stephen Boyd
2022-01-20 21:56     ` Daniel Latypov
2022-01-20 21:56       ` Daniel Latypov
2022-01-21  4:34       ` Stephen Boyd
2022-01-21  4:34         ` Stephen Boyd
2022-01-21  5:25         ` Daniel Latypov
2022-01-21  5:25           ` Daniel Latypov
2022-01-22  1:51           ` Stephen Boyd
2022-01-22  1:51             ` Stephen Boyd
2022-01-20 14:34 ` [PATCH v3 02/10] clk: Always clamp the rounded rate Maxime Ripard
2022-01-20 14:34   ` Maxime Ripard
2022-01-20 14:34 ` [PATCH v3 03/10] clk: Use clamp instead of open-coding our own Maxime Ripard
2022-01-20 14:34   ` Maxime Ripard
2022-01-20 14:34 ` [PATCH v3 04/10] clk: Always set the rate on clk_set_range_rate Maxime Ripard
2022-01-20 14:34   ` Maxime Ripard
2022-01-20 14:34 ` [PATCH v3 05/10] clk: Add clk_drop_range Maxime Ripard
2022-01-20 14:34   ` Maxime Ripard
2022-01-20 14:34 ` [PATCH v3 06/10] clk: bcm: rpi: Add variant structure Maxime Ripard
2022-01-20 14:34   ` Maxime Ripard
2022-01-20 14:34 ` [PATCH v3 07/10] clk: bcm: rpi: Set a default minimum rate Maxime Ripard
2022-01-20 14:34   ` Maxime Ripard
2022-01-20 14:34 ` [PATCH v3 08/10] clk: bcm: rpi: Run some clocks at the minimum rate allowed Maxime Ripard
2022-01-20 14:34   ` Maxime Ripard
2022-01-20 14:34 ` Maxime Ripard [this message]
2022-01-20 14:34   ` [PATCH v3 09/10] drm/vc4: Add logging and comments Maxime Ripard
2022-01-20 14:34 ` [PATCH v3 10/10] drm/vc4: hdmi: Remove clock rate initialization Maxime Ripard
2022-01-20 14:34   ` Maxime Ripard

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