From: Eric Anholt <e...@anholt.net>
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 <e...@anholt.net>
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
---
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_SHIFT 24
+/* 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_OFF BIT(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_MASK VC4_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_SHIFT 0
+
+/* 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 0x0f4
+# define VC4_HDMI_CEC_CNT_TO_4300_US_MASK VC4_MASK(31, 24)
+# define VC4_HDMI_CEC_CNT_TO_4300_US_SHIFT 24
+# define VC4_HDMI_CEC_CNT_TO_3900_US_MASK VC4_MASK(23, 16)
+# define VC4_HDMI_CEC_CNT_TO_3900_US_SHIFT 16
+# define VC4_HDMI_CEC_CNT_TO_3600_US_MASK VC4_MASK(15, 8)
+# define VC4_HDMI_CEC_CNT_TO_3600_US_SHIFT 8
+# define VC4_HDMI_CEC_CNT_TO_3500_US_MASK VC4_MASK(7, 0)
+# define VC4_HDMI_CEC_CNT_TO_3500_US_SHIFT 0
+
+#define VC4_HDMI_CEC_CNTRL_5 0x0f8
+# define VC4_HDMI_CEC_TX_SW_RESET BIT(27)
+# define VC4_HDMI_CEC_RX_SW_RESET BIT(26)
+# define VC4_HDMI_CEC_PAD_SW_RESET BIT(25)
+# define VC4_HDMI_CEC_MUX_TP_OUT_CEC BIT(24)
+# define VC4_HDMI_CEC_RX_CEC_INT BIT(23)
+# define VC4_HDMI_CEC_CLK_PRELOAD_MASK VC4_MASK(22, 16)
+# define VC4_HDMI_CEC_CLK_PRELOAD_SHIFT 16
+# define VC4_HDMI_CEC_CNT_TO_4700_US_MASK VC4_MASK(15, 8)
+# define VC4_HDMI_CEC_CNT_TO_4700_US_SHIFT 8
+# define VC4_HDMI_CEC_CNT_TO_4500_US_MASK VC4_MASK(7, 0)
+# define VC4_HDMI_CEC_CNT_TO_4500_US_SHIFT 0
+
+/* Transmit data, first byte is low byte of the 32-bit reg. MSB of
+ * each byte transmitted first.
+ */
+#define VC4_HDMI_CEC_TX_DATA_1 0x0fc
+#define VC4_HDMI_CEC_TX_DATA_2 0x100
+#define VC4_HDMI_CEC_TX_DATA_3 0x104
+#define VC4_HDMI_CEC_TX_DATA_4 0x108
+#define VC4_HDMI_CEC_RX_DATA_1 0x10c
+#define VC4_HDMI_CEC_RX_DATA_2 0x110
+#define VC4_HDMI_CEC_RX_DATA_3 0x114
+#define VC4_HDMI_CEC_RX_DATA_4 0x118
+
#define VC4_HDMI_TX_PHY_RESET_CTL 0x2c0
#define VC4_HDMI_TX_PHY_CTL0 0x2c4
# define VC4_HDMI_TX_PHY_RNG_PWRDN BIT(25)
+/* Interrupt status bits */
+#define VC4_HDMI_CPU_STATUS 0x340
+#define VC4_HDMI_CPU_SET 0x344
+#define VC4_HDMI_CPU_CLEAR 0x348
+# define VC4_HDMI_CPU_CEC BIT(6)
+# define VC4_HDMI_CPU_HOTPLUG BIT(0)
+
#define VC4_HDMI_GCP(x) (0x400 + ((x) * 0x4))
#define VC4_HDMI_RAM_PACKET(x) (0x400 + ((x) * 0x24))
#define VC4_HDMI_PACKET_STRIDE 0x24
#define VC4_HD_M_CTL 0x00c
+/* Debug: Current receive value on the CEC pad. */
+# define VC4_HD_CECRXD BIT(9)
+/* Debug: Override CEC output to 0. */
+# define VC4_HD_CECOVR BIT(8)
# define VC4_HD_M_REGISTER_FILE_STANDBY (3 << 6)
# define VC4_HD_M_RAM_STANDBY (3 << 4)
# define VC4_HD_M_SW_RST BIT(2)
--
2.11.0
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