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Message-Id: <20220204091915.421812582@linuxfoundation.org>
Date: Fri, 4 Feb 2022 10:22:15 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Michael Stapelberg <michael+drm@...pelberg.ch>,
Maxime Ripard <maxime@...no.tech>
Subject: [PATCH 5.15 05/32] drm/vc4: hdmi: Make sure the device is powered with CEC
From: Maxime Ripard <maxime@...no.tech>
Commit 20b0dfa86bef0e80b41b0e5ac38b92f23b6f27f9 upstream.
The original commit depended on a rework commit (724fc856c09e ("drm/vc4:
hdmi: Split the CEC disable / enable functions in two")) that
(rightfully) didn't reach stable.
However, probably because the context changed, when the patch was
applied to stable the pm_runtime_put called got moved to the end of the
vc4_hdmi_cec_adap_enable function (that would have become
vc4_hdmi_cec_disable with the rework) to vc4_hdmi_cec_init.
This means that at probe time, we now drop our reference to the clocks
and power domains and thus end up with a CPU hang when the CPU tries to
access registers.
The call to pm_runtime_resume_and_get() is also problematic since the
.adap_enable CEC hook is called both to enable and to disable the
controller. That means that we'll now call pm_runtime_resume_and_get()
at disable time as well, messing with the reference counting.
The behaviour we should have though would be to have
pm_runtime_resume_and_get() called when the CEC controller is enabled,
and pm_runtime_put when it's disabled.
We need to move things around a bit to behave that way, but it aligns
stable with upstream.
Cc: <stable@...r.kernel.org> # 5.10.x
Cc: <stable@...r.kernel.org> # 5.15.x
Cc: <stable@...r.kernel.org> # 5.16.x
Reported-by: Michael Stapelberg <michael+drm@...pelberg.ch>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 25 +++++++++++++------------
1 file changed, 13 insertions(+), 12 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1738,18 +1738,18 @@ static int vc4_hdmi_cec_adap_enable(stru
u32 val;
int ret;
- ret = pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev);
- if (ret)
- return ret;
+ if (enable) {
+ ret = pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev);
+ if (ret)
+ return ret;
- val = HDMI_READ(HDMI_CEC_CNTRL_5);
- val &= ~(VC4_HDMI_CEC_TX_SW_RESET | VC4_HDMI_CEC_RX_SW_RESET |
- VC4_HDMI_CEC_CNT_TO_4700_US_MASK |
- VC4_HDMI_CEC_CNT_TO_4500_US_MASK);
- val |= ((4700 / usecs) << VC4_HDMI_CEC_CNT_TO_4700_US_SHIFT) |
- ((4500 / usecs) << VC4_HDMI_CEC_CNT_TO_4500_US_SHIFT);
+ val = HDMI_READ(HDMI_CEC_CNTRL_5);
+ val &= ~(VC4_HDMI_CEC_TX_SW_RESET | VC4_HDMI_CEC_RX_SW_RESET |
+ VC4_HDMI_CEC_CNT_TO_4700_US_MASK |
+ VC4_HDMI_CEC_CNT_TO_4500_US_MASK);
+ val |= ((4700 / usecs) << VC4_HDMI_CEC_CNT_TO_4700_US_SHIFT) |
+ ((4500 / usecs) << VC4_HDMI_CEC_CNT_TO_4500_US_SHIFT);
- if (enable) {
HDMI_WRITE(HDMI_CEC_CNTRL_5, val |
VC4_HDMI_CEC_TX_SW_RESET | VC4_HDMI_CEC_RX_SW_RESET);
HDMI_WRITE(HDMI_CEC_CNTRL_5, val);
@@ -1777,7 +1777,10 @@ static int vc4_hdmi_cec_adap_enable(stru
HDMI_WRITE(HDMI_CEC_CPU_MASK_SET, VC4_HDMI_CPU_CEC);
HDMI_WRITE(HDMI_CEC_CNTRL_5, val |
VC4_HDMI_CEC_TX_SW_RESET | VC4_HDMI_CEC_RX_SW_RESET);
+
+ pm_runtime_put(&vc4_hdmi->pdev->dev);
}
+
return 0;
}
@@ -1888,8 +1891,6 @@ static int vc4_hdmi_cec_init(struct vc4_
if (ret < 0)
goto err_remove_handlers;
- pm_runtime_put(&vc4_hdmi->pdev->dev);
-
return 0;
err_remove_handlers:
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