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From:   Jernej Skrabec <jernej.skrabec@siol.net>
To:     maxime.ripard@bootlin.com
Cc:     a.hajda@samsung.com, Laurent.pinchart@ideasonboard.com,
        airlied@linux.ie, daniel@ffwll.ch, wens@csie.org,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] drm/bridge/synopsys: dw-hdmi: Add an option to suppress loading CEC driver
Date:   Sun, 24 Mar 2019 22:21:42 +0100
Message-Id: <20190324212144.3652-2-jernej.skrabec@siol.net>
In-Reply-To: <20190324212144.3652-1-jernej.skrabec@siol.net>
References: <20190324212144.3652-1-jernej.skrabec@siol.net>
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Sender: linux-kernel-owner@vger.kernel.org
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DW HDMI controller on some Allwinner SoCs has support for CEC, but due
to additional logic put between CEC controller and pins, it doesn't work
correctly, at least not with a lot of instrusive changes. Fortunately,
it's still possible to bitbang protocol.

For such cases, add a platform option to suppress loading CEC driver. If
DW HDMI CEC driver would be loaded, it wouldn't work anyway and only
cause a confusion with multiple /dev entries.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 2 +-
 include/drm/bridge/dw_hdmi.h              | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/=
bridge/synopsys/dw-hdmi.c
index a63e5f0dae56..fdda26f8b056 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2634,7 +2634,7 @@ __dw_hdmi_probe(struct platform_device *pdev,
 		hdmi->audio =3D platform_device_register_full(&pdevinfo);
 	}
=20
-	if (config0 & HDMI_CONFIG0_CEC) {
+	if (!plat_data->is_cec_unusable && (config0 & HDMI_CONFIG0_CEC)) {
 		cec.hdmi =3D hdmi;
 		cec.ops =3D &dw_hdmi_cec_ops;
 		cec.irq =3D irq;
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index 66e70770cce5..764b8bcfa62c 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -144,6 +144,8 @@ struct dw_hdmi_plat_data {
 	int (*configure_phy)(struct dw_hdmi *hdmi,
 			     const struct dw_hdmi_plat_data *pdata,
 			     unsigned long mpixelclock);
+
+	unsigned int is_cec_unusable : 1;
 };
=20
 struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
--=20
2.21.0