Re: [PATCH v7 2/2] i2c: qcom-geni: Add dynamic transfer timeout based on transfer length and frequency

[Mukesh Savaliya <mukesh.savaliya@oss.qualcomm.com>]

On 8/13/2026 11:15 AM, Aniket Randive wrote:

[...]

>   static int geni_i2c_gpi_multi_xfer_timeout_handler(struct device *dev,
>   						   struct geni_i2c_gpi_multi_desc_xfer *multi_xfer,
> -						   u32 transfer_timeout_msecs,
> +						   unsigned long timeout_jiffies,
>   						   struct completion *transfer_comp)
>   {
>   	int i;
> -	u32 time_left;
> +	unsigned long time_left;
>   
>   	for (i = 0; i < multi_xfer->msg_idx_cnt - 1; i++) {
>   		reinit_completion(transfer_comp);
>   
>   		if (multi_xfer->msg_idx_cnt != multi_xfer->irq_cnt) {
>   			time_left = wait_for_completion_timeout(transfer_comp,
> -								transfer_timeout_msecs);
> +								timeout_jiffies);
>   			if (!time_left) {
>   				dev_err(dev, "%s: Transfer timeout\n", __func__);
>   				return -ETIMEDOUT;
> @@ -778,8 +787,22 @@ static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[],
>   		dma_async_issue_pending(gi2c->tx_c);
>   
>   		if ((msg_idx == (gi2c->num_msgs - 1)) || flags & DMA_PREP_INTERRUPT) {
> +			size_t max_len = 0;
> +			int j;
> +
> +			/*
> +			 * Use the longest message as the timeout base: one completion
> +			 * covers the whole BEI batch, so the budget must fit the worst
> +			 * case single-message wire time.
> +			 */

Using only the longest message length may under-estimate the required 
Timeout.

> +			for (j = 0; j < gi2c->num_msgs; j++)
> +				max_len = max_t(size_t, max_len, msgs[j].len);
can we use sum(msgs[i].len) instead of max() ?> +		 
i2c_update_timeout(&gi2c->adap, gi2c->clk_freq_out, max_len,
> +					   I2C_TIMEOUT_SAFETY_COEFFICIENT,
> +					   I2C_TIMEOUT_MIN_USEC);
>   			ret = geni_i2c_gpi_multi_xfer_timeout_handler(gi2c->se.dev, gi2c_gpi_xfer,
> -								      XFER_TIMEOUT, &gi2c->done);
> +								      gi2c->adap.timeout,
> +								      &gi2c->done);
>   			if (ret) {
>   				dev_err(gi2c->se.dev,
>   					"I2C multi write msg transfer timeout: %d\n",
> @@ -899,7 +922,10 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i
>   
>   		if (!gi2c->is_tx_multi_desc_xfer) {
>   			dma_async_issue_pending(gi2c->tx_c);
> -			time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
> +			i2c_update_timeout(&gi2c->adap, gi2c->clk_freq_out, msgs[i].len,
> +					   I2C_TIMEOUT_SAFETY_COEFFICIENT,
> +					   I2C_TIMEOUT_MIN_USEC);
> +			time_left = wait_for_completion_timeout(&gi2c->done, gi2c->adap.timeout);
>   			if (!time_left) {
>   				dev_err(gi2c->se.dev, "%s:I2C timeout\n", __func__);
>   				gi2c->err = -ETIMEDOUT;
>