From 9c6e4f6ed1d61d5f46946e5c151ceb279eedadb1 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Thu, 19 Aug 2021 15:59:27 +0200
Subject: [PATCH] drm/vc4: hdmi: Make sure the controller is powered up during bind
Git-commit: 9c6e4f6ed1d61d5f46946e5c151ceb279eedadb1
Patch-mainline: v5.17-rc1
References: git-fixes
In the bind hook, we actually need the device to have the HSM clock
running during the final part of the display initialisation where we
reset the controller and initialise the CEC component.
Failing to do so will result in a complete, silent, hang of the CPU.
Fixes: 411efa18e4b0 ("drm/vc4: hdmi: Move the HSM clock enable to runtime_pm")
Link: https://patchwork.freedesktop.org/patch/msgid/20210819135931.895976-3-maxime@cerno.tech
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 7a6b7cac8af3..104078f10fc6 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -2199,6 +2199,18 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
if (ret)
goto err_put_ddc;
+ /*
+ * We need to have the device powered up at this point to call
+ * our reset hook and for the CEC init.
+ */
+ ret = vc4_hdmi_runtime_resume(dev);
+ if (ret)
+ goto err_put_ddc;
+
+ pm_runtime_get_noresume(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
if (vc4_hdmi->variant->reset)
vc4_hdmi->variant->reset(vc4_hdmi);
@@ -2210,8 +2222,6 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
clk_prepare_enable(vc4_hdmi->pixel_bvb_clock);
}
- pm_runtime_enable(dev);
-
drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
drm_encoder_helper_add(encoder, &vc4_hdmi_encoder_helper_funcs);
@@ -2235,6 +2245,8 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
vc4_hdmi_debugfs_regs,
vc4_hdmi);
+ pm_runtime_put_sync(dev);
+
return 0;
err_free_cec:
@@ -2245,6 +2257,7 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
vc4_hdmi_connector_destroy(&vc4_hdmi->connector);
err_destroy_encoder:
drm_encoder_cleanup(encoder);
+ pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
err_put_ddc:
put_device(&vc4_hdmi->ddc->dev);
--
2.31.1