linux-kernel - Re: [PATCH] [v2] media: nxp: imx8-isi: fix buiding on 32-bit

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Message-ID: <44761257-5271-b10e-9ff0-4832e3e9f89e@xs4all.nl>
Date:   Tue, 18 Apr 2023 08:52:24 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Arnd Bergmann <arnd@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Jacopo Mondi <jacopo.mondi@...asonboard.com>,
        Dong Aisheng <aisheng.dong@....com>,
        Guoniu Zhou <guoniu.zhou@....com>,
        Christian Hemp <c.hemp@...tec.de>, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] media: nxp: imx8-isi: fix buiding on 32-bit

Hi Laurent, Mauro,

On 18/04/2023 08:47, Laurent Pinchart wrote:
> Hi Arnd,
> 
> Thank you for the patch.
> 
> On Tue, Apr 18, 2023 at 08:11:43AM +0200, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>>
>> The #if check is wrong, leading to a build failure:
>>
>> drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c: In function 'mxc_isi_channel_set_inbuf':
>> drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c:33:5: error: "CONFIG_ARCH_DMA_ADDR_T_64BIT" is not defined, evaluates to 0 [-Werror=undef]
>>    33 | #if CONFIG_ARCH_DMA_ADDR_T_64BIT
>>       |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> This could just be an #ifdef, but it seems nicer to just remove
>> the check entirely. Apparently the only reason for the #ifdef
>> is to avoid another warning:
>>
>> drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c:55:24: error: right shift count >= width of type [-Werror=shift-count-overflow]
>>
>> But this is best avoided by using the lower_32_bits()/upper_32_bits()
>> helpers.
>>
>> Fixes: cf21f328fcaf ("media: nxp: Add i.MX8 ISI driver")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> 
> Mauro, could you please pick this up for v6.4 ?

I'll pick this one up, I have three rcar-vin fixes as well that slipped to the cracks
and that need to go in.

Regards,

	Hans

> 
>> ---
>> v2: whitespace fixup
>> ---
>>  .../media/platform/nxp/imx8-isi/imx8-isi-hw.c | 41 ++++++++++---------
>>  1 file changed, 21 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c
>> index db538f3d88ec..19e80b95ffea 100644
>> --- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c
>> +++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c
>> @@ -29,11 +29,10 @@ static inline void mxc_isi_write(struct mxc_isi_pipe *pipe, u32 reg, u32 val)
>>  
>>  void mxc_isi_channel_set_inbuf(struct mxc_isi_pipe *pipe, dma_addr_t dma_addr)
>>  {
>> -	mxc_isi_write(pipe, CHNL_IN_BUF_ADDR, dma_addr);
>> -#if CONFIG_ARCH_DMA_ADDR_T_64BIT
>> +	mxc_isi_write(pipe, CHNL_IN_BUF_ADDR, lower_32_bits(dma_addr));
>>  	if (pipe->isi->pdata->has_36bit_dma)
>> -		mxc_isi_write(pipe, CHNL_IN_BUF_XTND_ADDR, dma_addr >> 32);
>> -#endif
>> +		mxc_isi_write(pipe, CHNL_IN_BUF_XTND_ADDR,
>> +			      upper_32_bits(dma_addr));
>>  }
>>  
>>  void mxc_isi_channel_set_outbuf(struct mxc_isi_pipe *pipe,
>> @@ -45,34 +44,36 @@ void mxc_isi_channel_set_outbuf(struct mxc_isi_pipe *pipe,
>>  	val = mxc_isi_read(pipe, CHNL_OUT_BUF_CTRL);
>>  
>>  	if (buf_id == MXC_ISI_BUF1) {
>> -		mxc_isi_write(pipe, CHNL_OUT_BUF1_ADDR_Y, dma_addrs[0]);
>> -		mxc_isi_write(pipe, CHNL_OUT_BUF1_ADDR_U, dma_addrs[1]);
>> -		mxc_isi_write(pipe, CHNL_OUT_BUF1_ADDR_V, dma_addrs[2]);
>> -#if CONFIG_ARCH_DMA_ADDR_T_64BIT
>> +		mxc_isi_write(pipe, CHNL_OUT_BUF1_ADDR_Y,
>> +			      lower_32_bits(dma_addrs[0]));
>> +		mxc_isi_write(pipe, CHNL_OUT_BUF1_ADDR_U,
>> +			      lower_32_bits(dma_addrs[1]));
>> +		mxc_isi_write(pipe, CHNL_OUT_BUF1_ADDR_V,
>> +			      lower_32_bits(dma_addrs[2]));
>>  		if (pipe->isi->pdata->has_36bit_dma) {
>>  			mxc_isi_write(pipe, CHNL_Y_BUF1_XTND_ADDR,
>> -				      dma_addrs[0] >> 32);
>> +				      upper_32_bits(dma_addrs[0]));
>>  			mxc_isi_write(pipe, CHNL_U_BUF1_XTND_ADDR,
>> -				      dma_addrs[1] >> 32);
>> +				      upper_32_bits(dma_addrs[1]));
>>  			mxc_isi_write(pipe, CHNL_V_BUF1_XTND_ADDR,
>> -				      dma_addrs[2] >> 32);
>> +				      upper_32_bits(dma_addrs[2]));
>>  		}
>> -#endif
>>  		val ^= CHNL_OUT_BUF_CTRL_LOAD_BUF1_ADDR;
>>  	} else  {
>> -		mxc_isi_write(pipe, CHNL_OUT_BUF2_ADDR_Y, dma_addrs[0]);
>> -		mxc_isi_write(pipe, CHNL_OUT_BUF2_ADDR_U, dma_addrs[1]);
>> -		mxc_isi_write(pipe, CHNL_OUT_BUF2_ADDR_V, dma_addrs[2]);
>> -#if CONFIG_ARCH_DMA_ADDR_T_64BIT
>> +		mxc_isi_write(pipe, CHNL_OUT_BUF2_ADDR_Y,
>> +			      lower_32_bits(dma_addrs[0]));
>> +		mxc_isi_write(pipe, CHNL_OUT_BUF2_ADDR_U,
>> +			      lower_32_bits(dma_addrs[1]));
>> +		mxc_isi_write(pipe, CHNL_OUT_BUF2_ADDR_V,
>> +			      lower_32_bits(dma_addrs[2]));
>>  		if (pipe->isi->pdata->has_36bit_dma) {
>>  			mxc_isi_write(pipe, CHNL_Y_BUF2_XTND_ADDR,
>> -				      dma_addrs[0] >> 32);
>> +				      upper_32_bits(dma_addrs[0]));
>>  			mxc_isi_write(pipe, CHNL_U_BUF2_XTND_ADDR,
>> -				      dma_addrs[1] >> 32);
>> +				      upper_32_bits(dma_addrs[1]));
>>  			mxc_isi_write(pipe, CHNL_V_BUF2_XTND_ADDR,
>> -				      dma_addrs[2] >> 32);
>> +				      upper_32_bits(dma_addrs[2]));
>>  		}
>> -#endif
>>  		val ^= CHNL_OUT_BUF_CTRL_LOAD_BUF2_ADDR;
>>  	}
>>  
>