linux-kernel - Re: [PATCH 5/5] i2c: geni: sdm845: dont perform DMA for OnePlus 6 devices

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Date:   Sat, 21 Nov 2020 21:47:09 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Caleb Connolly <caleb@...nolly.tech>
Cc:     linux-arm-msm@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Akash Asthana <akashast@...eaurora.org>,
        Mukesh Savaliya <msavaliy@...eaurora.org>,
        phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] i2c: geni: sdm845: dont perform DMA for OnePlus 6
 devices

On Thu 12 Nov 10:22 CST 2020, Caleb Connolly wrote:

> The OnePlus 6/T has the same issue as the Yoga c630 causing a crash when DMA
> is used for i2c, so disable it.
> 
> https://patchwork.kernel.org/patch/11133827/
> 
> Signed-off-by: Caleb Connolly <caleb@...nolly.tech>
> ---
>  drivers/i2c/busses/i2c-qcom-geni.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
> index 8b4c35f47a70..9acdcfe73be2 100644
> --- a/drivers/i2c/busses/i2c-qcom-geni.c
> +++ b/drivers/i2c/busses/i2c-qcom-geni.c
> @@ -357,7 +357,8 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
>  	struct geni_se *se = &gi2c->se;
>  	size_t len = msg->len;
>  
> -	if (!of_machine_is_compatible("lenovo,yoga-c630"))
> +	if (!of_machine_is_compatible("lenovo,yoga-c630") &&
> +	    !of_machine_is_compatible("oneplus,oneplus6"))

This hack seems to have been working around two separate issues. First
with iommu active the GENI wrappers needs to have their stream mapping
configured. Secondly there was a bug in the transaction setup that was
recently fixed by Doug Anderson.

So can you please give the following patch a go? I've yet to test it on
the Lenovo machine, but I think it allows us to remove the quirk.

https://lore.kernel.org/lkml/20201122034149.626045-1-bjorn.andersson@linaro.org/T/#u

Regards,
Bjorn

>  		dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
>  
>  	if (dma_buf)
> @@ -399,7 +400,8 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
>  	struct geni_se *se = &gi2c->se;
>  	size_t len = msg->len;
>  
> -	if (!of_machine_is_compatible("lenovo,yoga-c630"))
> +	if (!of_machine_is_compatible("lenovo,yoga-c630") &&
> +	    !of_machine_is_compatible("oneplus,oneplus6"))
>  		dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
>  
>  	if (dma_buf)
> -- 
> 2.29.2
> 
>