From: Eric Anholt
Basic usage:
poweron: HSM clock should be running. Set the bit clock divider,
set all the other _US timeouts based on bit clock rate. Bring RX/TX
reset up and then down.
powerdown: Set RX/TX reset.
interrupt: read CPU_STATUS, write bits that have been handled to
CPU_CLEAR.
Bits are added to /debug/dri/0/hdmi_regs so you can check out the
power-on values.
Signed-off-by: Eric Anholt
Signed-off-by: Hans Verkuil
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 16 ++
drivers/gpu/drm/vc4/vc4_regs.h | 108 +
2 files changed, 124 insertions(+)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index e0104f96011e..b0521e6cc281 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -149,6 +149,22 @@ static const struct {
HDMI_REG(VC4_HDMI_VERTB1),
HDMI_REG(VC4_HDMI_TX_PHY_RESET_CTL),
HDMI_REG(VC4_HDMI_TX_PHY_CTL0),
+
+ HDMI_REG(VC4_HDMI_CEC_CNTRL_1),
+ HDMI_REG(VC4_HDMI_CEC_CNTRL_2),
+ HDMI_REG(VC4_HDMI_CEC_CNTRL_3),
+ HDMI_REG(VC4_HDMI_CEC_CNTRL_4),
+ HDMI_REG(VC4_HDMI_CEC_CNTRL_5),
+ HDMI_REG(VC4_HDMI_CPU_STATUS),
+
+ HDMI_REG(VC4_HDMI_CEC_RX_DATA_1),
+ HDMI_REG(VC4_HDMI_CEC_RX_DATA_2),
+ HDMI_REG(VC4_HDMI_CEC_RX_DATA_3),
+ HDMI_REG(VC4_HDMI_CEC_RX_DATA_4),
+ HDMI_REG(VC4_HDMI_CEC_TX_DATA_1),
+ HDMI_REG(VC4_HDMI_CEC_TX_DATA_2),
+ HDMI_REG(VC4_HDMI_CEC_TX_DATA_3),
+ HDMI_REG(VC4_HDMI_CEC_TX_DATA_4),
};
static const struct {
diff --git a/drivers/gpu/drm/vc4/vc4_regs.h b/drivers/gpu/drm/vc4/vc4_regs.h
index d382c34c1b9e..b18cc20ee185 100644
--- a/drivers/gpu/drm/vc4/vc4_regs.h
+++ b/drivers/gpu/drm/vc4/vc4_regs.h
@@ -561,16 +561,124 @@
# define VC4_HDMI_VERTB_VBP_MASK VC4_MASK(8, 0)
# define VC4_HDMI_VERTB_VBP_SHIFT 0
+#define VC4_HDMI_CEC_CNTRL_1 0x0e8
+/* Set when the transmission has ended. */
+# define VC4_HDMI_CEC_TX_EOM BIT(31)
+/* If set, transmission was acked on the 1st or 2nd attempt (only one
+ * retry is attempted). If in continuous mode, this means TX needs to
+ * be filled if !TX_EOM.
+ */
+# define VC4_HDMI_CEC_TX_STATUS_GOOD BIT(30)
+# define VC4_HDMI_CEC_RX_EOM BIT(29)
+# define VC4_HDMI_CEC_RX_STATUS_GOOD BIT(28)
+/* Number of bytes received for the message. */
+# define VC4_HDMI_CEC_REC_WRD_CNT_MASK VC4_MASK(27, 24)
+# define VC4_HDMI_CEC_REC_WRD_CNT_SHIFT24
+/* Sets continuous receive mode. Generates interrupt after each 8
+ * bytes to signal that RX_DATA should be consumed, and at RX_EOM.
+ *
+ * If disabled, maximum 16 bytes will be received (including header),
+ * and interrupt at RX_EOM. Later bytes will be acked but not put
+ * into the RX_DATA.
+ */
+# define VC4_HDMI_CEC_RX_CONTINUE BIT(23)
+# define VC4_HDMI_CEC_TX_CONTINUE BIT(22)
+/* Set this after a CEC interrupt. */
+# define VC4_HDMI_CEC_CLEAR_RECEIVE_OFFBIT(21)
+/* Starts a TX. Will wait for appropriate idel time before CEC
+ * activity. Must be cleared in between transmits.
+ */
+# define VC4_HDMI_CEC_START_XMIT_BEGIN BIT(20)
+# define VC4_HDMI_CEC_MESSAGE_LENGTH_MASK VC4_MASK(19, 16)
+# define VC4_HDMI_CEC_MESSAGE_LENGTH_SHIFT 16
+/* Device's CEC address */
+# define VC4_HDMI_CEC_ADDR_MASKVC4_MASK(15, 12)
+# define VC4_HDMI_CEC_ADDR_SHIFT 12
+/* Divides off of HSM clock to generate CEC bit clock. */
+# define VC4_HDMI_CEC_DIV_CLK_CNT_MASK VC4_MASK(11, 0)
+# define VC4_HDMI_CEC_DIV_CLK_CNT_SHIFT0
+
+/* Set these fields to how many bit clock cycles get to that many
+ * microseconds.
+ */
+#define VC4_HDMI_CEC_CNTRL_2 0x0ec
+# define VC4_HDMI_CEC_CNT_TO_1500_US_MASK VC4_MASK(30, 24)
+# define VC4_HDMI_CEC_CNT_TO_1500_US_SHIFT 24
+# define VC4_HDMI_CEC_CNT_TO_1300_US_MASK VC4_MASK(23, 17)
+# define VC4_HDMI_CEC_CNT_TO_1300_US_SHIFT 17
+# define VC4_HDMI_CEC_CNT_TO_800_US_MASK VC4_MASK(16, 11)
+# define VC4_HDMI_CEC_CNT_TO_800_US_SHIFT 11
+# define VC4_HDMI_CEC_CNT_TO_600_US_MASK VC4_MASK(10, 5)
+# define VC4_HDMI_CEC_CNT_TO_600_US_SHIFT 5
+# define VC4_HDMI_CEC_CNT_TO_400_US_MASK VC4_MASK(4, 0)
+# define VC4_HDMI_CEC_CNT_TO_400_US_SHIFT 0
+
+#define VC4_HDMI_CEC_CNTRL_3 0x0f0
+# define VC4_HDMI_CEC_CNT_TO_2750_US_MASK VC4_MASK(31, 24)
+# define VC4_HDMI_CEC_CNT_TO_2750_US_SHIFT 24
+# define VC4_HDMI_CEC_CNT_TO_2400_US_MASK VC4_MASK(23, 16)
+# define VC4_HDMI_CEC_CNT_TO_2400_US_SHIFT 16
+# define VC4_HDMI_CEC_CNT_TO_2050_US_MASK VC4_MASK(15, 8)
+# define VC4_HDMI_CEC_CNT_TO_2050_US_SHIFT 8
+# define VC4_HDMI_CEC_CNT_TO_1700_US_MASK VC4_MASK(7, 0)
+# define VC4_HDMI_CEC_CNT_TO_1700_US_SHIFT 0
+
+#define VC4_HDMI_CEC_CNTRL_4