linux-kernel - [PATCH v1] i2c: qcom-geni: Update i2c frequency table to match hardware guidance

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Message-Id: <20250122064634.2864432-1-quic_msavaliy@quicinc.com>
Date: Wed, 22 Jan 2025 12:16:34 +0530
From: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
To: andi.shyti@...nel.org, linux-arm-msm@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
Subject: [PATCH v1] i2c: qcom-geni: Update i2c frequency table to match hardware guidance

With the current settings, the I2C buses are achieving around 370KHz
instead of the expected 400KHz. For 100KHz and 1MHz, the settings are
now more compliant and adhere to the Qualcomm’s internal programming
guide.

Update the I2C frequency table to align with the recommended values
outlined in the I2C hardware programming guide, ensuring proper
communication and performance.

Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
---
 drivers/i2c/busses/i2c-qcom-geni.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
index 7a22e1f46e60..cc0c683febbb 100644
--- a/drivers/i2c/busses/i2c-qcom-geni.c
+++ b/drivers/i2c/busses/i2c-qcom-geni.c
@@ -148,9 +148,9 @@ struct geni_i2c_clk_fld {
  * source_clock = 19.2 MHz
  */
 static const struct geni_i2c_clk_fld geni_i2c_clk_map_19p2mhz[] = {
-	{KHZ(100), 7, 10, 11, 26},
-	{KHZ(400), 2,  5, 12, 24},
-	{KHZ(1000), 1, 3,  9, 18},
+	{KHZ(100), 7, 10, 12, 26},
+	{KHZ(400), 2,  5, 11, 22},
+	{KHZ(1000), 1, 2,  8, 18},
 	{},
 };
 
-- 
2.25.1