linux-kernel - Re: [PATCH] soc: qcom: geni-se: Do not bother about enable/disable of interrupts in secondary sequencer for non-uart modes

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Date:   Mon, 12 Jun 2023 19:09:52 +0530
From:   Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>
To:     Doug Anderson <dianders@...omium.org>
CC:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_msavaliy@...cinc.com>,
        <mka@...omium.org>, <swboyd@...omium.org>,
        <quic_vtanuku@...cinc.com>
Subject: Re: [PATCH] soc: qcom: geni-se: Do not bother about enable/disable of
 interrupts in secondary sequencer for non-uart modes

Hi,

Thank you very much for the review...


On 6/7/2023 9:41 PM, Doug Anderson wrote:
> Hi,
>
> On Fri, Jun 2, 2023 at 11:13 AM Vijaya Krishna Nivarthi
> <quic_vnivarth@...cinc.com> wrote:
>> The select_fifo/dma_mode() functions in geni driver enable/disable
>> interrupts (secondary included) conditionally for non-uart modes, while
>> uart is supposed to manage this internally.
>> However, only uart uses secondary IRQs while spi, i2c do not care about
>> these at all making their enablement (or disablement) totally unnecessary
>> for these protos.
>>
>> Drop enabling/disabling secondary IRQs for non-uart modes.
>> This doesn't solve any observed problem but only gets rid of code pieces
>> that are not required.
>>
>> Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>
>> ---
>>   drivers/soc/qcom/qcom-geni-se.c | 24 ++++--------------------
>>   1 file changed, 4 insertions(+), 20 deletions(-)
> This seems like a nice cleanup to me. It's still odd that the general
> code has a special case for UART, but I guess the alternative is to
> duplicate the exact same logic for both the i2c and SPI drivers. I
> won't insist on that, though I wouldn't be opposed to it either.
>
> I guess one comment, though: should we also remove the code that
> messes with "SE_GENI_S_IRQ_EN" in geni_se_select_gpi_mode()?


Right now we have gpi-dma mode support for i2c and spi but not for uart.

Even when gpi-dma support is added, uart driver's interrupt handler 
would not be invoked so I believe it would be safe to drop that code 
from geni_se_select_gpi_mode() too.

I will post v2 dropping same after some more lookup.

-Vijay/


>
> -Doug