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From b4627f9f36d8af7cb7bf24d8c1daee8b48f12299 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Mon, 11 Jan 2021 15:23:02 +0100
Subject: [PATCH] drm/vc4: hdmi: Introduce a CEC clock
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.
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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(-)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -151,7 +151,7 @@ static void vc4_hdmi_cec_update_clk_div(
* 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);
}
@@ -1869,6 +1869,7 @@ static int vc4_hdmi_init_resources(struc
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;
}
@@ -1963,6 +1964,12 @@ static int vc5_hdmi_init_resources(struc
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");
--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
@@ -154,6 +154,7 @@ 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;
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