Re: [PATCH v2] i2c: qcom-geni: Fix hardcoded clock index in SE_GENI_CLK_SEL

[Viken Dadhaniya <viken.dadhaniya@oss.qualcomm.com>]

On 9/21/2026 5:17 PM, Viken Dadhaniya wrote:
> qcom_geni_i2c_conf() writes a hardcoded 0 to SE_GENI_CLK_SEL, which
> selects an index from the hardware clock performance table. This always
> picks the first table entry regardless of the actual source clock
> configuration. On platforms where the matching entry is not at index 0,
> the wrong source clock divider is active and the I2C bus runs at an
> incorrect frequency.
> 
> Use geni_se_clk_freq_match() in geni_i2c_clk_map_idx() to find the
> performance table index for the source clock (32 MHz or 19.2 MHz). Store
> the resolved index in a new clk_idx field in geni_i2c_dev and write it
> to SE_GENI_CLK_SEL instead of the hardcoded 0.
> 
> Fixes: 37692de5d523 ("i2c: i2c-qcom-geni: Add bus driver for the Qualcomm GENI I2C controller")
> Cc: stable@vger.kernel.org
> Signed-off-by: Viken Dadhaniya <viken.dadhaniya@oss.qualcomm.com>
> ---
> Changes in v2:
> - Update the comment describing the source-clock frequency requirement
>   and the rejection of higher-frequency multiples.
> - Add a blank line before the final return statement, as suggested.
> - Link to v1: https://patch.msgid.link/20260828-i2c-fix-se-clk-conf-v1-1-9adc72308f2d@oss.qualcomm.com
> 
> --- b4-submit-tracking ---
> {
>   "series": {
>     "revision": 2,
>     "change-id": "20260807-i2c-fix-se-clk-conf-89f6f92d373a",
>     "prefixes": [],
>     "presubject": "",
>     "history": {
>       "v1": [
>         "20260828-i2c-fix-se-clk-conf-v1-1-9adc72308f2d@oss.qualcomm.com"
>       ]
>     }
>   }
> }

Please ignore the --- b4-submit-tracking --- block; it is internal b4
metadata accidentally included during the rebase.
> ---
>  drivers/i2c/busses/i2c-qcom-geni.c | 38 +++++++++++++++++++++++++++++++++-----
>  1 file changed, 33 insertions(+), 5 deletions(-)
[...]