linux-kernel - [PATCH v12 3/6] i2c: tegra: Update Tegra256 timing parameters

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Message-ID: <20251115042632.69708-4-akhilrajeev@nvidia.com>
Date: Sat, 15 Nov 2025 09:56:29 +0530
From: Akhil R <akhilrajeev@...dia.com>
To: <andi.shyti@...nel.org>, <digetx@...il.com>, <jonathanh@...dia.com>,
	<linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-tegra@...r.kernel.org>, <thierry.reding@...il.com>,
	<wsa+renesas@...g-engineering.com>, <wsa@...nel.org>
CC: <kkartik@...dia.com>, <akhilrajeev@...dia.com>, <ldewangan@...dia.com>,
	<smangipudi@...dia.com>
Subject: [PATCH v12 3/6] i2c: tegra: Update Tegra256 timing parameters

Update the timing parameters of Tegra256 so that the signals are complaint
with the I2C specification for SCL low time.

Signed-off-by: Akhil R <akhilrajeev@...dia.com>
---
 drivers/i2c/busses/i2c-tegra.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index c0382c9a0430..8a696c88882e 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1677,14 +1677,13 @@ static const struct tegra_i2c_hw_feature tegra194_i2c_hw = {
 	.setup_hold_time_hs_mode = 0x090909,
 	.has_interface_timing_reg = true,
 };
-
 static const struct tegra_i2c_hw_feature tegra256_i2c_hw = {
 	.has_continue_xfer_support = true,
 	.has_per_pkt_xfer_complete_irq = true,
 	.clk_divisor_hs_mode = 7,
 	.clk_divisor_std_mode = 0x7a,
 	.clk_divisor_fast_mode = 0x40,
-	.clk_divisor_fast_plus_mode = 0x19,
+	.clk_divisor_fast_plus_mode = 0x14,
 	.has_config_load_reg = true,
 	.has_multi_master_mode = true,
 	.has_slcg_override_reg = true,
@@ -1695,14 +1694,13 @@ static const struct tegra_i2c_hw_feature tegra256_i2c_hw = {
 	.has_apb_dma = false,
 	.tlow_std_mode = 0x8,
 	.thigh_std_mode = 0x7,
-	.tlow_fast_mode = 0x3,
-	.thigh_fast_mode = 0x3,
-	.tlow_fastplus_mode = 0x3,
-	.thigh_fastplus_mode = 0x3,
+	.tlow_fast_mode = 0x4,
+	.thigh_fast_mode = 0x2,
+	.tlow_fastplus_mode = 0x4,
+	.thigh_fastplus_mode = 0x4,
 	.setup_hold_time_std_mode = 0x08080808,
-	.setup_hold_time_fast_mode = 0x02020202,
-	.setup_hold_time_fastplus_mode = 0x02020202,
-	.setup_hold_time_hs_mode = 0x090909,
+	.setup_hold_time_fast_mode = 0x04010101,
+	.setup_hold_time_fastplus_mode = 0x04020202,
 	.has_interface_timing_reg = true,
 };
 
-- 
2.50.1