sun4i_hdmi: add CEC support

Add HDMI CEC support to the Allwinner A10 SoC.

This SoC uses a poor-man's CEC implementation by polling the CEC pin. It is
using the CEC_PIN core implementation for such devices to do the heavy
lifting. It just provides the callbacks to read/drive the CEC pin.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Tested-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi.h b/drivers/gpu/drm/sun4i/sun4i_hdmi.h
index 0957ff2076ac..1457750988da 100644
--- a/drivers/gpu/drm/sun4i/sun4i_hdmi.h
+++ b/drivers/gpu/drm/sun4i/sun4i_hdmi.h
@@ -15,6 +15,8 @@
 #include <drm/drm_connector.h>
 #include <drm/drm_encoder.h>
 
+#include <media/cec.h>
+
 #define SUN4I_HDMI_CTRL_REG		0x004
 #define SUN4I_HDMI_CTRL_ENABLE			BIT(31)
 
@@ -86,6 +88,11 @@
 #define SUN4I_HDMI_PLL_DBG0_TMDS_PARENT_MASK	BIT(21)
 #define SUN4I_HDMI_PLL_DBG0_TMDS_PARENT_SHIFT	21
 
+#define SUN4I_HDMI_CEC			0x214
+#define SUN4I_HDMI_CEC_ENABLE			BIT(11)
+#define SUN4I_HDMI_CEC_TX			BIT(9)
+#define SUN4I_HDMI_CEC_RX			BIT(8)
+
 #define SUN4I_HDMI_PKT_CTRL_REG(n)	(0x2f0 + (4 * (n)))
 #define SUN4I_HDMI_PKT_CTRL_TYPE(n, t)		((t) << (((n) % 4) * 4))
 
@@ -172,6 +179,7 @@ struct sun4i_hdmi {
 	struct sun4i_drv	*drv;
 
 	bool			hdmi_monitor;
+	struct cec_adapter	*cec_adap;
 };
 
 int sun4i_ddc_create(struct sun4i_hdmi *hdmi, struct clk *clk);