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From:   Abdel Alkuor <alkuor@gmail.com>
To:     heikki.krogerus@linux.intel.com, krzysztof.kozlowski+dt@linaro.org,
        bryan.odonoghue@linaro.org
Cc:     gregkh@linuxfoundation.org, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org, ryan.eleceng@gmail.com,
        robh+dt@kernel.org, conor+dt@kernel.org,
        devicetree@vger.kernel.org, Abdel Alkuor <abdelalkuor@geotab.com>
Subject: [PATCH v9 05/14] USB: typec: tps6598x: Check for EEPROM present
Date:   Sun,  1 Oct 2023 04:11:25 -0400
Message-Id: <20231001081134.37101-6-alkuor@gmail.com>
In-Reply-To: <20231001081134.37101-1-alkuor@gmail.com>
References: <20231001081134.37101-1-alkuor@gmail.com>
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From: Abdel Alkuor <abdelalkuor@geotab.com>

When an EEPROM is present, tps25750 loads the binary configuration from
EEPROM. Hence, all we need to do is wait for the device to switch to APP
mode

Signed-off-by: Abdel Alkuor <abdelalkuor@geotab.com>
---
Changes in v9:
  - No changes
Changes in v8:
  - No changes
Changes in v7:
  - Add driver name to commit subject
Changes in v6: 
  - Update eeprom macro to use TPS instead
Changes in v5:
  - Incorporating tps25750 into tps6598x driver

 drivers/usb/typec/tipd/core.c     | 13 +++++++++++++
 drivers/usb/typec/tipd/tps6598x.h |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 2e7b9eafaf04..21b0ea2c9627 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -37,6 +37,7 @@
 #define TPS_REG_STATUS			0x1a
 #define TPS_REG_SYSTEM_CONF		0x28
 #define TPS_REG_CTRL_CONF		0x29
+#define TPS_REG_BOOT_STATUS		0x2D
 #define TPS_REG_POWER_STATUS		0x3f
 #define TPS_REG_RX_IDENTITY_SOP		0x48
 #define TPS_REG_DATA_STATUS		0x5f
@@ -910,6 +911,17 @@ static int tps25750_apply_patch(struct tps6598x *tps)
 {
 	int ret;
 	unsigned long timeout;
+	u64 status = 0;
+
+	ret = tps6598x_block_read(tps, TPS_REG_BOOT_STATUS, &status, 5);
+	if (ret)
+		return ret;
+	/*
+	 * Nothing to be done if the configuration
+	 * is being loaded from EERPOM
+	 */
+	if (status & TPS_BOOT_STATUS_I2C_EEPROM_PRESENT)
+		goto wait_for_app;
 
 	ret = tps25750_start_patch_burst_mode(tps);
 	if (ret) {
@@ -921,6 +933,7 @@ static int tps25750_apply_patch(struct tps6598x *tps)
 	if (ret)
 		return ret;
 
+wait_for_app:
 	timeout = jiffies + msecs_to_jiffies(1000);
 
 	do {
diff --git a/drivers/usb/typec/tipd/tps6598x.h b/drivers/usb/typec/tipd/tps6598x.h
index 527857549d69..a80d0929f3ee 100644
--- a/drivers/usb/typec/tipd/tps6598x.h
+++ b/drivers/usb/typec/tipd/tps6598x.h
@@ -199,4 +199,7 @@
 #define TPS_DATA_STATUS_DP_SPEC_PIN_ASSIGNMENT_A    BIT(2)
 #define TPS_DATA_STATUS_DP_SPEC_PIN_ASSIGNMENT_B    (BIT(2) | BIT(1))
 
+/* BOOT STATUS REG*/
+#define TPS_BOOT_STATUS_I2C_EEPROM_PRESENT	BIT(3)
+
 #endif /* __TPS6598X_H__ */
-- 
2.34.1