From: Maxime Ripard <maxime@cerno.tech>
To: dri-devel@lists.freedesktop.org,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Thomas Zimmermann <tzimmermann@suse.de>,
Maxime Ripard <maxime@cerno.tech>
Cc: Tim Gover <tim.gover@raspberrypi.com>,
Dave Stevenson <dave.stevenson@raspberrypi.com>,
David Airlie <airlied@linux.ie>,
stable@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com,
linux-rpi-kernel@lists.infradead.org,
Daniel Vetter <daniel.vetter@intel.com>,
Phil Elwell <phil@raspberrypi.com>,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Subject: [PATCH v3 4/9] drm/vc4: hdmi: Prevent clock unbalance
Date: Tue, 13 Apr 2021 16:54:36 +0200 [thread overview]
Message-ID: <20210413145441.483977-5-maxime@cerno.tech> (raw)
In-Reply-To: <20210413145441.483977-1-maxime@cerno.tech>
Since we fixed the hooks to disable the encoder at boot, we now have an
unbalanced clk_disable call at boot since we never enabled them in the
first place.
Let's mimic the state of the hardware and enable the clocks at boot if
the controller is enabled to get the use-count right.
Cc: <stable@vger.kernel.org> # v5.10+
Fixes: 09c438139b8f ("drm/vc4: hdmi: Implement finer-grained hooks")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 1fda574579af..9c919472ae84 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1995,6 +1995,14 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
if (vc4_hdmi->variant->reset)
vc4_hdmi->variant->reset(vc4_hdmi);
+ if ((of_device_is_compatible(dev->of_node, "brcm,bcm2711-hdmi0") ||
+ of_device_is_compatible(dev->of_node, "brcm,bcm2711-hdmi1")) &&
+ HDMI_READ(HDMI_VID_CTL) & VC4_HD_VID_CTL_ENABLE) {
+ clk_prepare_enable(vc4_hdmi->pixel_clock);
+ clk_prepare_enable(vc4_hdmi->hsm_clock);
+ clk_prepare_enable(vc4_hdmi->pixel_bvb_clock);
+ }
+
pm_runtime_enable(dev);
drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
--
2.30.2
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next prev parent reply other threads:[~2021-04-13 14:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-13 14:54 [PATCH v3 0/9] drm/vc4: hdmi: Support the 4k @ 60Hz modes Maxime Ripard
2021-04-13 14:54 ` [PATCH v3 1/9] drm/vc4: txp: Properly set the possible_crtcs mask Maxime Ripard
2021-04-13 14:54 ` [PATCH v3 2/9] drm/vc4: crtc: Skip the TXP Maxime Ripard
2021-04-13 14:54 ` [PATCH v3 3/9] drm/vc4: Rework the encoder retrieval code Maxime Ripard
2021-04-13 14:54 ` Maxime Ripard [this message]
2021-04-13 14:54 ` [PATCH v3 5/9] drm/vc4: hvs: Make the HVS bind first Maxime Ripard
2021-04-13 14:54 ` [PATCH v3 6/9] drm/vc4: hdmi: Properly compute the BVB clock rate Maxime Ripard
2021-04-13 14:54 ` [PATCH v3 7/9] drm/vc4: hdmi: Check and warn if we can't reach 4kp60 frequencies Maxime Ripard
2021-04-13 14:54 ` [PATCH v3 8/9] drm/vc4: hdmi: Enable the scrambler Maxime Ripard
2021-04-13 14:54 ` [PATCH v3 9/9] drm/vc4: hdmi: Raise the maximum clock rate Maxime Ripard
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