From: Maxime Ripard <maxime@cerno.tech>
To: Eric Anholt <eric@anholt.net>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Thomas Zimmermann <tzimmermann@suse.de>,
Maxime Ripard <maxime@cerno.tech>,
Daniel Vetter <daniel.vetter@intel.com>,
David Airlie <airlied@linux.ie>
Cc: Jason Cooper <jason@lakedaemon.net>,
bcm-kernel-feedback-list@broadcom.com,
linux-arm-kernel@lists.infradead.org,
Marc Zyngier <maz@kernel.org>,
linux-media@vger.kernel.org,
Hans Verkuil <hverkuil-cisco@xs4all.nl>,
linux-kernel@vger.kernel.org,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Dave Stevenson <dave.stevenson@raspberrypi.com>,
linux-rpi-kernel@lists.infradead.org,
dri-devel@lists.freedesktop.org
Subject: [PATCH 08/15] drm/vc4: hdmi: Introduce a CEC clock
Date: Thu, 10 Dec 2020 14:46:41 +0100 [thread overview]
Message-ID: <20201210134648.272857-9-maxime@cerno.tech> (raw)
In-Reply-To: <20201210134648.272857-1-maxime@cerno.tech>
While the BCM2835 had the CEC clock derived from the HSM clock, the
BCM2711 has a dedicated parent clock for it.
Let's introduce a separate clock for it so that we can handle both
cases.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 9 ++++++++-
drivers/gpu/drm/vc4/vc4_hdmi.h | 1 +
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index b93ee3e26e2b..0debd22bc992 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -145,7 +145,7 @@ static void vc4_hdmi_cec_update_clk_div(struct vc4_hdmi *vc4_hdmi)
* Set the clock divider: the hsm_clock rate and this divider
* setting will give a 40 kHz CEC clock.
*/
- clk_cnt = clk_get_rate(vc4_hdmi->hsm_clock) / CEC_CLOCK_FREQ;
+ clk_cnt = clk_get_rate(vc4_hdmi->cec_clock) / CEC_CLOCK_FREQ;
value |= clk_cnt << VC4_HDMI_CEC_DIV_CLK_CNT_SHIFT;
HDMI_WRITE(HDMI_CEC_CNTRL_1, value);
}
@@ -1740,6 +1740,7 @@ static int vc4_hdmi_init_resources(struct vc4_hdmi *vc4_hdmi)
return PTR_ERR(vc4_hdmi->hsm_clock);
}
vc4_hdmi->audio_clock = vc4_hdmi->hsm_clock;
+ vc4_hdmi->cec_clock = vc4_hdmi->hsm_clock;
return 0;
}
@@ -1833,6 +1834,12 @@ static int vc5_hdmi_init_resources(struct vc4_hdmi *vc4_hdmi)
return PTR_ERR(vc4_hdmi->audio_clock);
}
+ vc4_hdmi->cec_clock = devm_clk_get(dev, "cec");
+ if (IS_ERR(vc4_hdmi->cec_clock)) {
+ DRM_ERROR("Failed to get CEC clock\n");
+ return PTR_ERR(vc4_hdmi->cec_clock);
+ }
+
vc4_hdmi->reset = devm_reset_control_get(dev, NULL);
if (IS_ERR(vc4_hdmi->reset)) {
DRM_ERROR("Failed to get HDMI reset line\n");
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
index 720914761261..adc4bf33ff15 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
@@ -155,6 +155,7 @@ struct vc4_hdmi {
bool cec_tx_ok;
bool cec_irq_was_rx;
+ struct clk *cec_clock;
struct clk *pixel_clock;
struct clk *hsm_clock;
struct clk *audio_clock;
--
2.28.0
next prev parent reply other threads:[~2020-12-10 13:49 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-10 13:46 [PATCH 00/15] drm/vc4: hdmi: Add CEC support for the BCM2711 Maxime Ripard
2020-12-10 13:46 ` [PATCH 01/15] irqchip: Allow to compile bcmstb on other platforms Maxime Ripard
2020-12-10 17:33 ` Florian Fainelli
2020-12-10 17:59 ` Marc Zyngier
2020-12-14 15:27 ` Maxime Ripard
2020-12-14 16:20 ` Marc Zyngier
2020-12-10 13:46 ` [PATCH 02/15] drm/vc4: hdmi: Move hdmi reset to bind Maxime Ripard
2020-12-18 11:20 ` Dave Stevenson
2020-12-10 13:46 ` [PATCH 03/15] drm/vc4: hdmi: Fix register offset with longer CEC messages Maxime Ripard
2020-12-15 11:23 ` Dave Stevenson
2020-12-10 13:46 ` [PATCH 04/15] drm/vc4: hdmi: Fix up CEC registers Maxime Ripard
2020-12-18 11:21 ` Dave Stevenson
2020-12-10 13:46 ` [PATCH 05/15] drm/vc4: hdmi: Restore cec physical address on reconnect Maxime Ripard
2020-12-18 14:21 ` Dave Stevenson
2020-12-18 14:45 ` Dave Stevenson
2021-01-11 10:29 ` Maxime Ripard
2020-12-10 13:46 ` [PATCH 06/15] drm/vc4: hdmi: Compute the CEC clock divider from the clock rate Maxime Ripard
2020-12-18 11:30 ` Dave Stevenson
2020-12-10 13:46 ` [PATCH 07/15] drm/vc4: hdmi: Update the CEC clock divider on HSM rate change Maxime Ripard
2020-12-18 14:26 ` Dave Stevenson
2020-12-10 13:46 ` Maxime Ripard [this message]
2020-12-18 11:37 ` [PATCH 08/15] drm/vc4: hdmi: Introduce a CEC clock Dave Stevenson
2020-12-18 12:23 ` Maxime Ripard
2020-12-18 12:25 ` Dave Stevenson
2020-12-10 13:46 ` [PATCH 09/15] drm/vc4: hdmi: Split the interrupt handlers Maxime Ripard
2020-12-10 13:46 ` [PATCH 10/15] drm/vc4: hdmi: Support BCM2711 CEC interrupt setup Maxime Ripard
2020-12-10 13:46 ` [PATCH 11/15] drm/vc4: hdmi: Remove cec_available flag Maxime Ripard
2020-12-18 14:30 ` Dave Stevenson
2020-12-10 13:46 ` [PATCH 12/15] drm/vc4: hdmi: Don't register the CEC adapter if there's no interrupts Maxime Ripard
2020-12-18 14:29 ` Dave Stevenson
2020-12-10 13:46 ` [PATCH 13/15] dt-binding: display: bcm2711-hdmi: Add CEC and hotplug interrupts Maxime Ripard
2020-12-10 13:46 ` [PATCH 14/15] ARM: dts: bcm2711: Add the BSC interrupt controller Maxime Ripard
2020-12-10 17:41 ` Florian Fainelli
2020-12-10 13:46 ` [PATCH 15/15] ARM: dts: bcm2711: Add the CEC " Maxime Ripard
2020-12-10 17:42 ` Florian Fainelli
2020-12-16 12:35 ` [PATCH 00/15] drm/vc4: hdmi: Add CEC support for the BCM2711 Hans Verkuil
2020-12-17 10:49 ` Maxime Ripard
2020-12-17 10:53 ` Hans Verkuil
2020-12-17 12:59 ` Maxime Ripard
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