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51 lines
1.8 KiB
Diff
51 lines
1.8 KiB
Diff
From 055b225c463ec348ab2701047016cc5957693320 Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime@cerno.tech>
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Date: Thu, 19 Aug 2021 15:59:30 +0200
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Subject: [PATCH 002/828] drm/vc4: hdmi: Make sure the device is powered with
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CEC
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Similarly to what we encountered with the detect hook with DRM, nothing
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actually prevents any of the CEC callback from being run while the HDMI
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output is disabled.
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However, this is an issue since any register access to the controller
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when it's powered down will result in a silent hang.
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Let's make sure we run the runtime_pm hooks when the CEC adapter is
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opened and closed by the userspace to avoid that issue.
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Fixes: 15b4511a4af6 ("drm/vc4: add HDMI CEC support")
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Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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Link: https://patchwork.freedesktop.org/patch/msgid/20210819135931.895976-6-maxime@cerno.tech
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---
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drivers/gpu/drm/vc4/vc4_hdmi.c | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
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+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
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@@ -1744,8 +1744,14 @@ static int vc4_hdmi_cec_enable(struct ce
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struct vc4_hdmi *vc4_hdmi = cec_get_drvdata(adap);
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/* clock period in microseconds */
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const u32 usecs = 1000000 / CEC_CLOCK_FREQ;
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- u32 val = HDMI_READ(HDMI_CEC_CNTRL_5);
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+ u32 val;
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+ int ret;
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+ ret = pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev);
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+ if (ret)
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+ return ret;
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+
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+ val = HDMI_READ(HDMI_CEC_CNTRL_5);
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val &= ~(VC4_HDMI_CEC_TX_SW_RESET | VC4_HDMI_CEC_RX_SW_RESET |
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VC4_HDMI_CEC_CNT_TO_4700_US_MASK |
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VC4_HDMI_CEC_CNT_TO_4500_US_MASK);
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@@ -1788,6 +1794,8 @@ static int vc4_hdmi_cec_disable(struct c
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HDMI_WRITE(HDMI_CEC_CNTRL_5, HDMI_READ(HDMI_CEC_CNTRL_5) |
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VC4_HDMI_CEC_TX_SW_RESET | VC4_HDMI_CEC_RX_SW_RESET);
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+ pm_runtime_put(&vc4_hdmi->pdev->dev);
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+
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return 0;
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}
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