From: Kathiravan Thirumoorthy Date: Tue, 13 May 2025 11:08:33 +0000 (+0530) Subject: i2c: qcom-geni: fix I2C frequency table to achieve accurate bus rates X-Git-Tag: v6.17-rc1~44^2~3^2 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=85c34532849dae0fdcf880900ac9d7718a73fd1b;p=thirdparty%2Flinux.git i2c: qcom-geni: fix I2C frequency table to achieve accurate bus rates Update the I2C frequency table to match the recommended values specified in the I2C hardware programming guide. In the current IPQ5424 configuration where 32MHz is the source clock, the I2C bus frequencies do not meet expectations—for instance, 363KHz is achieved instead of the expected 400KHz. Fixes: 506bb2ab0075 ("i2c: qcom-geni: Support systems with 32MHz serial engine clock") Signed-off-by: Kathiravan Thirumoorthy Cc: # v6.13+ Reviewed-by: Mukesh Kumar Savaliya Signed-off-by: Andi Shyti Link: https://lore.kernel.org/r/20250513-i2c-bus-freq-v1-1-9a333ad5757f@oss.qualcomm.com --- diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c index 13889f52b6f78..ff2289b52c84c 100644 --- a/drivers/i2c/busses/i2c-qcom-geni.c +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -155,9 +155,9 @@ static const struct geni_i2c_clk_fld geni_i2c_clk_map_19p2mhz[] = { /* source_clock = 32 MHz */ static const struct geni_i2c_clk_fld geni_i2c_clk_map_32mhz[] = { - { I2C_MAX_STANDARD_MODE_FREQ, 8, 14, 18, 40 }, - { I2C_MAX_FAST_MODE_FREQ, 4, 3, 11, 20 }, - { I2C_MAX_FAST_MODE_PLUS_FREQ, 2, 3, 6, 15 }, + { I2C_MAX_STANDARD_MODE_FREQ, 8, 14, 18, 38 }, + { I2C_MAX_FAST_MODE_FREQ, 4, 3, 9, 19 }, + { I2C_MAX_FAST_MODE_PLUS_FREQ, 2, 3, 5, 15 }, {} };