linux-kernel - Re: [PATCH] dmaengine: tegra: Use platform_get

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Date:   Mon, 16 May 2022 09:42:07 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Akhil R <akhilrajeev@...dia.com>, dmaengine@...r.kernel.org,
        ldewangan@...dia.com, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, p.zabel@...gutronix.de,
        thierry.reding@...il.com, vkoul@...nel.org
Subject: Re: [PATCH] dmaengine: tegra: Use platform_get_irq() to get IRQ
 resource

Vinod,

On 05/05/2022 10:18, Jon Hunter wrote:
> 
> On 05/05/2022 10:14, Akhil R wrote:
>> Use platform_irq_get() instead platform_get_resource() for IRQ resource
>> to fix the probe failure. platform_get_resource() fails to fetch the IRQ
>> resource as it might not be ready at that time.
>>
>> platform_irq_get() is also the recommended way to get interrupt as it
>> directly gives the IRQ number and no conversion from resource is
>> required.
>>
>> Fixes: ee17028009d4 ("dmaengine: tegra: Add tegra gpcdma driver")
>> Reported-by: Jonathan Hunter <jonathanh@...dia.com>
>> Signed-off-by: Akhil R <akhilrajeev@...dia.com>
>> ---
>>   drivers/dma/tegra186-gpc-dma.c | 12 ++++--------
>>   1 file changed, 4 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/dma/tegra186-gpc-dma.c 
>> b/drivers/dma/tegra186-gpc-dma.c
>> index 97fe0e9e9b83..3951db527dec 100644
>> --- a/drivers/dma/tegra186-gpc-dma.c
>> +++ b/drivers/dma/tegra186-gpc-dma.c
>> @@ -1328,7 +1328,6 @@ static int tegra_dma_probe(struct 
>> platform_device *pdev)
>>       struct iommu_fwspec *iommu_spec;
>>       unsigned int stream_id, i;
>>       struct tegra_dma *tdma;
>> -    struct resource    *res;
>>       int ret;
>>       cdata = of_device_get_match_data(&pdev->dev);
>> @@ -1367,16 +1366,13 @@ static int tegra_dma_probe(struct 
>> platform_device *pdev)
>>       for (i = 0; i < cdata->nr_channels; i++) {
>>           struct tegra_dma_channel *tdc = &tdma->channels[i];
>> +        tdc->irq = platform_get_irq(pdev, i);
>> +        if (tdc->irq < 0)
>> +            return tdc->irq;
>> +
>>           tdc->chan_base_offset = TEGRA_GPCDMA_CHANNEL_BASE_ADD_OFFSET +
>>                       i * cdata->channel_reg_size;
>> -        res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
>> -        if (!res) {
>> -            dev_err(&pdev->dev, "No irq resource for chan %d\n", i);
>> -            return -EINVAL;
>> -        }
>> -        tdc->irq = res->start;
>>           snprintf(tdc->name, sizeof(tdc->name), "gpcdma.%d", i);
>> -
>>           tdc->tdma = tdma;
>>           tdc->id = i;
>>           tdc->slave_id = -1;
> 
> 
> Thanks!
> 
> Reviewed-by: Jon Hunter <jonathanh@...dia.com>


OK to pick this up for -next/5.19? This is preventing the GPC DMA driver 
from working.

Jon

-- 
nvpublic