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sun4i_hdmi: add CEC support

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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>
This commit is contained in:
Hans Verkuil
2017-07-11 08:30:44 +02:00
committed by Maxime Ripard
parent 9181b5bbdf
commit 998140d267
3 changed files with 71 additions and 1 deletions
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8
drivers/gpu/drm/sun4i/sun4i_hdmi.h
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@@ -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);