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From: Maxime Ripard <maxime@cerno.tech>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Maxime Ripard <maxime@cerno.tech>,
	dri-devel@lists.freedesktop.org,
	Daniel Vetter <daniel.vetter@intel.com>,
	David Airlie <airlied@linux.ie>
Cc: Eric Anholt <eric@anholt.net>,
	Nicolas Saenz Julienne <nsaenz@kernel.org>,
	bcm-kernel-feedback-list@broadcom.com,
	linux-rpi-kernel@lists.infradead.org,
	Dave Stevenson <dave.stevenson@raspberrypi.com>,
	Phil Elwell <phil@raspberrypi.com>,
	Tim Gover <tim.gover@raspberrypi.com>,
	Dom Cobley <dom@raspberrypi.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH v4 08/12] drm/vc4: hdmi: Properly compute the BVB clock rate
Date: Fri,  7 May 2021 17:05:11 +0200	[thread overview]
Message-ID: <20210507150515.257424-9-maxime@cerno.tech> (raw)
In-Reply-To: <20210507150515.257424-1-maxime@cerno.tech>

The BVB clock rate computation doesn't take into account a mode clock of
594MHz that we're going to need to support 4k60.

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 9c919472ae84..c50dc5a59b2f 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -91,7 +91,6 @@
 # define VC4_HD_M_ENABLE			BIT(0)
 
 #define CEC_CLOCK_FREQ 40000
-#define VC4_HSM_MID_CLOCK 149985000
 
 #define HDMI_14_MAX_TMDS_CLK   (340 * 1000 * 1000)
 
@@ -739,7 +738,7 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
 		conn_state_to_vc4_hdmi_conn_state(conn_state);
 	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
 	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
-	unsigned long pixel_rate, hsm_rate;
+	unsigned long bvb_rate, pixel_rate, hsm_rate;
 	int ret;
 
 	ret = pm_runtime_get_sync(&vc4_hdmi->pdev->dev);
@@ -793,12 +792,14 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
 
 	vc4_hdmi_cec_update_clk_div(vc4_hdmi);
 
-	/*
-	 * FIXME: When the pixel freq is 594MHz (4k60), this needs to be setup
-	 * at 300MHz.
-	 */
-	ret = clk_set_min_rate(vc4_hdmi->pixel_bvb_clock,
-			       (hsm_rate > VC4_HSM_MID_CLOCK ? 150000000 : 75000000));
+	if (pixel_rate > 297000000)
+		bvb_rate = 300000000;
+	else if (pixel_rate > 148500000)
+		bvb_rate = 150000000;
+	else
+		bvb_rate = 75000000;
+
+	ret = clk_set_min_rate(vc4_hdmi->pixel_bvb_clock, bvb_rate);
 	if (ret) {
 		DRM_ERROR("Failed to set pixel bvb clock rate: %d\n", ret);
 		clk_disable_unprepare(vc4_hdmi->hsm_clock);
-- 
2.31.1


WARNING: multiple messages have this Message-ID (diff)
From: Maxime Ripard <maxime@cerno.tech>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Maxime Ripard <maxime@cerno.tech>,
	dri-devel@lists.freedesktop.org,
	Daniel Vetter <daniel.vetter@intel.com>,
	David Airlie <airlied@linux.ie>
Cc: Nicolas Saenz Julienne <nsaenz@kernel.org>,
	Dom Cobley <dom@raspberrypi.com>,
	Tim Gover <tim.gover@raspberrypi.com>,
	Dave Stevenson <dave.stevenson@raspberrypi.com>,
	linux-kernel@vger.kernel.org,
	bcm-kernel-feedback-list@broadcom.com,
	linux-rpi-kernel@lists.infradead.org,
	Phil Elwell <phil@raspberrypi.com>
Subject: [PATCH v4 08/12] drm/vc4: hdmi: Properly compute the BVB clock rate
Date: Fri,  7 May 2021 17:05:11 +0200	[thread overview]
Message-ID: <20210507150515.257424-9-maxime@cerno.tech> (raw)
In-Reply-To: <20210507150515.257424-1-maxime@cerno.tech>

The BVB clock rate computation doesn't take into account a mode clock of
594MHz that we're going to need to support 4k60.

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 9c919472ae84..c50dc5a59b2f 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -91,7 +91,6 @@
 # define VC4_HD_M_ENABLE			BIT(0)
 
 #define CEC_CLOCK_FREQ 40000
-#define VC4_HSM_MID_CLOCK 149985000
 
 #define HDMI_14_MAX_TMDS_CLK   (340 * 1000 * 1000)
 
@@ -739,7 +738,7 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
 		conn_state_to_vc4_hdmi_conn_state(conn_state);
 	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
 	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
-	unsigned long pixel_rate, hsm_rate;
+	unsigned long bvb_rate, pixel_rate, hsm_rate;
 	int ret;
 
 	ret = pm_runtime_get_sync(&vc4_hdmi->pdev->dev);
@@ -793,12 +792,14 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
 
 	vc4_hdmi_cec_update_clk_div(vc4_hdmi);
 
-	/*
-	 * FIXME: When the pixel freq is 594MHz (4k60), this needs to be setup
-	 * at 300MHz.
-	 */
-	ret = clk_set_min_rate(vc4_hdmi->pixel_bvb_clock,
-			       (hsm_rate > VC4_HSM_MID_CLOCK ? 150000000 : 75000000));
+	if (pixel_rate > 297000000)
+		bvb_rate = 300000000;
+	else if (pixel_rate > 148500000)
+		bvb_rate = 150000000;
+	else
+		bvb_rate = 75000000;
+
+	ret = clk_set_min_rate(vc4_hdmi->pixel_bvb_clock, bvb_rate);
 	if (ret) {
 		DRM_ERROR("Failed to set pixel bvb clock rate: %d\n", ret);
 		clk_disable_unprepare(vc4_hdmi->hsm_clock);
-- 
2.31.1


  parent reply	other threads:[~2021-05-07 15:06 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-07 15:05 [PATCH v4 00/12] drm/vc4: hdmi: Support the 4k @ 60Hz modes Maxime Ripard
2021-05-07 15:05 ` Maxime Ripard
2021-05-07 15:05 ` [PATCH v4 01/12] drm/vc4: txp: Properly set the possible_crtcs mask Maxime Ripard
2021-05-07 15:05   ` Maxime Ripard
2021-05-07 15:05 ` [PATCH v4 02/12] drm/vc4: crtc: Skip the TXP Maxime Ripard
2021-05-07 15:05   ` Maxime Ripard
2021-05-07 15:05 ` [PATCH v4 03/12] drm/vc4: crtc: Pass the drm_atomic_state to config_pv Maxime Ripard
2021-05-07 15:05   ` Maxime Ripard
2021-05-21 17:26   ` Dave Stevenson
2021-05-21 17:26     ` Dave Stevenson
2021-05-07 15:05 ` [PATCH v4 04/12] drm/vc4: crtc: Fix vc4_get_crtc_encoder logic Maxime Ripard
2021-05-07 15:05   ` Maxime Ripard
2021-05-21 17:54   ` Dave Stevenson
2021-05-21 17:54     ` Dave Stevenson
2021-05-07 15:05 ` [PATCH v4 05/12] drm/vc4: crtc: Lookup the encoder from the register at boot Maxime Ripard
2021-05-07 15:05   ` Maxime Ripard
2021-05-21 17:58   ` Dave Stevenson
2021-05-21 17:58     ` Dave Stevenson
2021-05-07 15:05 ` [PATCH v4 06/12] drm/vc4: hdmi: Prevent clock unbalance Maxime Ripard
2021-05-07 15:05   ` Maxime Ripard
2021-05-21 18:05   ` Dave Stevenson
2021-05-21 18:05     ` Dave Stevenson
2021-05-07 15:05 ` [PATCH v4 07/12] drm/vc4: hvs: Make the HVS bind first Maxime Ripard
2021-05-07 15:05   ` Maxime Ripard
2021-05-07 15:05 ` Maxime Ripard [this message]
2021-05-07 15:05   ` [PATCH v4 08/12] drm/vc4: hdmi: Properly compute the BVB clock rate Maxime Ripard
2021-05-07 15:05 ` [PATCH v4 09/12] drm/vc4: hdmi: Check and warn if we can't reach 4kp60 frequencies Maxime Ripard
2021-05-07 15:05   ` Maxime Ripard
2021-05-07 15:05 ` [PATCH v4 10/12] drm/vc4: hdmi: Enable the scrambler Maxime Ripard
2021-05-07 15:05   ` Maxime Ripard
2021-05-21 17:39   ` Dave Stevenson
2021-05-21 17:39     ` Dave Stevenson
2021-05-07 15:05 ` [PATCH v4 11/12] drm/vc4: hdmi: Add a workqueue to set scrambling Maxime Ripard
2021-05-07 15:05   ` Maxime Ripard
2021-05-21 17:43   ` Dave Stevenson
2021-05-21 17:43     ` Dave Stevenson
2021-05-07 15:05 ` [PATCH v4 12/12] drm/vc4: hdmi: Raise the maximum clock rate Maxime Ripard
2021-05-07 15:05   ` Maxime Ripard
2021-05-24 12:45 ` [PATCH v4 00/12] drm/vc4: hdmi: Support the 4k @ 60Hz modes Maxime Ripard
2021-05-24 12:45   ` Maxime Ripard

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