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Message-Id: <20250124-ub9xx-improvements-v2-22-f7075c99ea20@ideasonboard.com>
Date: Fri, 24 Jan 2025 17:17:59 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
Devarsh Thakkar <devarsht@...com>, Jai Luthra <jai.luthra@...asonboard.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: [PATCH v2 22/22] media: i2c: ds90ub9xx: Set serializer temperature
ramp
From: Jai Luthra <jai.luthra@...asonboard.com>
For continuous PLL lock, it is recommended to extend the temperature
ramp down range of the DS90UB953-Q1 serializer based on the device's
initial temperature [1].
The serializer's die temperature is reported only to the deserializer
through the sensor status registers, and for UB9702, it is recommended
to set the temperature ramp during the link setup sequence, i.e. before
we even probe the ub953 driver.
Add support to the deserializer driver to configure ub953's temperature
ramp.
[1]: Section 7.3.1.1 - https://www.ti.com/lit/gpn/ds90ub953-q1
Signed-off-by: Jai Luthra <jai.luthra@...asonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
---
drivers/media/i2c/ds90ub953.h | 7 ++-
drivers/media/i2c/ds90ub960.c | 125 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 131 insertions(+), 1 deletion(-)
diff --git a/drivers/media/i2c/ds90ub953.h b/drivers/media/i2c/ds90ub953.h
index de606474493f..97a6b3af326e 100644
--- a/drivers/media/i2c/ds90ub953.h
+++ b/drivers/media/i2c/ds90ub953.h
@@ -71,7 +71,7 @@
/* Indirect register blocks */
#define UB953_IND_TARGET_PAT_GEN 0x00
-#define UB953_IND_TARGET_FPD3_TX 0x01
+#define UB953_IND_TARGET_ANALOG 0x01
#define UB953_IND_TARGET_DIE_ID 0x02
#define UB953_IND_PGEN_CTL 0x01
@@ -92,6 +92,11 @@
#define UB953_IND_PGEN_VFP 0x0f
#define UB953_IND_PGEN_COLOR(n) (0x10 + (n)) /* n <= 15 */
+#define UB953_IND_ANA_TEMP_DYNAMIC_CFG 0x4b
+#define UB953_IND_ANA_TEMP_DYNAMIC_CFG_OV BIT(5)
+#define UB953_IND_ANA_TEMP_STATIC_CFG 0x4c
+#define UB953_IND_ANA_TEMP_STATIC_CFG_MASK GENMASK(6, 4)
+
/* UB971 Registers */
#define UB971_ENH_BC_CHK 0x4b
diff --git a/drivers/media/i2c/ds90ub960.c b/drivers/media/i2c/ds90ub960.c
index 04488544da43..74977762bab6 100644
--- a/drivers/media/i2c/ds90ub960.c
+++ b/drivers/media/i2c/ds90ub960.c
@@ -2034,6 +2034,110 @@ static int ub960_rxport_serializer_write(struct ub960_rxport *rxport, u8 reg,
return ret;
}
+static int ub960_rxport_serializer_read(struct ub960_rxport *rxport, u8 reg,
+ u8 *val, int *err)
+{
+ struct ub960_data *priv = rxport->priv;
+ struct device *dev = &priv->client->dev;
+ union i2c_smbus_data data = { 0 };
+ int ret;
+
+ if (err && *err)
+ return *err;
+
+ ret = i2c_smbus_xfer(priv->client->adapter, rxport->ser.alias,
+ priv->client->flags, I2C_SMBUS_READ, reg,
+ I2C_SMBUS_BYTE_DATA, &data);
+ if (ret)
+ dev_err(dev,
+ "rx%u: cannot read serializer register 0x%02x (%d)!\n",
+ rxport->nport, reg, ret);
+ else
+ *val = data.byte;
+
+ if (ret && err)
+ *err = ret;
+
+ return ret;
+}
+
+static int ub960_serializer_temp_ramp(struct ub960_rxport *rxport)
+{
+ struct ub960_data *priv = rxport->priv;
+ short temp_dynamic_offset[] = {-1, -1, 0, 0, 1, 1, 1, 3};
+ u8 temp_dynamic_cfg;
+ u8 nport = rxport->nport;
+ u8 ser_temp_code;
+ int ret;
+
+ /* Configure temp ramp only on UB953 */
+ if (!fwnode_device_is_compatible(rxport->ser.fwnode, "ti,ds90ub953-q1"))
+ return 0;
+
+ /* Read current serializer die temperature */
+ ub960_rxport_read(priv, nport, UB960_RR_SENSOR_STS_2, &ser_temp_code,
+ &ret);
+
+ /* Enable I2C passthrough on back channel */
+ ub960_rxport_update_bits(priv, nport, UB960_RR_BCC_CONFIG,
+ UB960_RR_BCC_CONFIG_I2C_PASS_THROUGH,
+ UB960_RR_BCC_CONFIG_I2C_PASS_THROUGH, &ret);
+
+ if (ret)
+ return ret;
+
+ /* Select indirect page for analog regs on the serializer */
+ ub960_rxport_serializer_write(rxport, UB953_REG_IND_ACC_CTL,
+ UB953_IND_TARGET_ANALOG << 2, &ret);
+
+ /* Set temperature ramp dynamic and static config */
+ ub960_rxport_serializer_write(rxport, UB953_REG_IND_ACC_ADDR,
+ UB953_IND_ANA_TEMP_DYNAMIC_CFG, &ret);
+ ub960_rxport_serializer_read(rxport, UB953_REG_IND_ACC_DATA,
+ &temp_dynamic_cfg, &ret);
+
+ if (ret)
+ return ret;
+
+ temp_dynamic_cfg |= UB953_IND_ANA_TEMP_DYNAMIC_CFG_OV;
+ temp_dynamic_cfg += temp_dynamic_offset[ser_temp_code];
+
+ /* Update temp static config */
+ ub960_rxport_serializer_write(rxport, UB953_REG_IND_ACC_ADDR,
+ UB953_IND_ANA_TEMP_STATIC_CFG, &ret);
+ ub960_rxport_serializer_write(rxport, UB953_REG_IND_ACC_DATA,
+ UB953_IND_ANA_TEMP_STATIC_CFG_MASK, &ret);
+
+ /* Update temperature ramp dynamic config */
+ ub960_rxport_serializer_write(rxport, UB953_REG_IND_ACC_ADDR,
+ UB953_IND_ANA_TEMP_DYNAMIC_CFG, &ret);
+
+ /* Enable I2C auto ack on BC before we set dynamic cfg and reset */
+ ub960_rxport_update_bits(priv, nport, UB960_RR_BCC_CONFIG,
+ UB960_RR_BCC_CONFIG_AUTO_ACK_ALL,
+ UB960_RR_BCC_CONFIG_AUTO_ACK_ALL, &ret);
+
+ ub960_rxport_serializer_write(rxport, UB953_REG_IND_ACC_DATA,
+ temp_dynamic_cfg, &ret);
+
+ if (ret)
+ return ret;
+
+ /* Soft reset to apply PLL updates */
+ ub960_rxport_serializer_write(rxport, UB953_REG_RESET_CTL,
+ UB953_REG_RESET_CTL_DIGITAL_RESET_0,
+ &ret);
+ msleep(20);
+
+ /* Disable I2C passthrough and auto-ack on BC */
+ ub960_rxport_update_bits(priv, nport, UB960_RR_BCC_CONFIG,
+ UB960_RR_BCC_CONFIG_I2C_PASS_THROUGH |
+ UB960_RR_BCC_CONFIG_AUTO_ACK_ALL,
+ 0x0, &ret);
+
+ return ret;
+}
+
static int ub960_rxport_bc_ser_config(struct ub960_rxport *rxport)
{
struct ub960_data *priv = rxport->priv;
@@ -2413,6 +2517,20 @@ static int ub960_init_rx_ports_ub960(struct ub960_data *priv)
return ret;
}
+ /* Set temperature ramp on serializer */
+ for_each_active_rxport(priv, it) {
+ ret = ub960_serializer_temp_ramp(it.rxport);
+ if (ret)
+ return ret;
+
+ ub960_rxport_update_bits(priv, it.nport, UB960_RR_BCC_CONFIG,
+ UB960_RR_BCC_CONFIG_I2C_PASS_THROUGH,
+ UB960_RR_BCC_CONFIG_I2C_PASS_THROUGH,
+ &ret);
+ if (ret)
+ return ret;
+ }
+
/*
* Clear any errors caused by switching the RX port settings while
* probing.
@@ -3169,6 +3287,13 @@ static int ub960_init_rx_ports_ub9702(struct ub960_data *priv)
/* Wait time for stable lock */
fsleep(15000);
+ /* Set temperature ramp on serializer */
+ for_each_active_rxport(priv, it) {
+ ret = ub960_serializer_temp_ramp(it.rxport);
+ if (ret)
+ return ret;
+ }
+
for_each_active_rxport_fpd4(priv, it) {
ret = ub960_enable_dfe_lms_ub9702(priv, it.nport);
if (ret)
--
2.43.0
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