linux-kernel - Re: [PATCH 1/6] sisfb: POST should fail if R/W test fails

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Date:	Mon, 14 Feb 2011 21:01:31 +0200 (EET)
From:	Aaro Koskinen <aaro.koskinen@....fi>
To:	"Janorkar, Mayuresh" <mayur@...com>
cc:	Aaro Koskinen <aaro.koskinen@....fi>,
	Thomas Winischhofer <thomas@...ischhofer.net>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] sisfb: POST should fail if R/W test fails

Hi,

On Mon, 14 Feb 2011, Janorkar, Mayuresh wrote:
>> diff --git a/drivers/video/sis/sis_main.c b/drivers/video/sis/sis_main.c
>> index 2fb8c5a..2c5de66 100644
>> --- a/drivers/video/sis/sis_main.c
>> +++ b/drivers/video/sis/sis_main.c
>> @@ -4627,11 +4627,11 @@ sisfb_post_xgi_rwtest(struct sis_video_info
>> *ivideo, int starta,
>>  	return 1;
>>  }
>>
>> -static void __devinit
>> +static int __devinit
>>  sisfb_post_xgi_ramsize(struct sis_video_info *ivideo)
>>  {
>>  	unsigned int buswidth, ranksize, channelab, mapsize;
>> -	int i, j, k, l;
>> +	int i, j, k, l, status;
>>  	u8 reg, sr14;
>>  	static const u8 dramsr13[12 * 5] = {
>>  		0x02, 0x0e, 0x0b, 0x80, 0x5d,
>> @@ -4673,7 +4673,7 @@ sisfb_post_xgi_ramsize(struct sis_video_info
>> *ivideo)
>>  		SiS_SetReg(SISSR, 0x13, 0x35);
>>  		SiS_SetReg(SISSR, 0x14, 0x41);
>>  		/* TODO */
>> -		return;
>> +		return -ENOMEM;
>>  	}
>>
>>  	/* Non-interleaving */
>> @@ -4835,6 +4835,7 @@ bail_out:
>>
>>  	j = (ivideo->chip == XGI_20) ? 5 : 9;
>>  	k = (ivideo->chip == XGI_20) ? 12 : 4;
>> +	status = -EIO;
>
> How about assigning this value during variable declaration?

Yes, that can be done.

>>
>>  	for(i = 0; i < k; i++) {
>>
>> @@ -4868,11 +4869,15 @@ bail_out:
>>  		SiS_SetRegANDOR(SISSR, 0x14, 0x0f, (reg & 0xf0));
>>  		sisfb_post_xgi_delay(ivideo, 1);
>>
>> -		if(sisfb_post_xgi_rwtest(ivideo, j, ((reg >> 4) + channelab -
>> 2 + 20), mapsize))
>> +		if (sisfb_post_xgi_rwtest(ivideo, j, ((reg >> 4) + channelab -
>> 2 + 20), mapsize)) {
>> +			status = 0;
>>  			break;
>> +		}
>>  	}
>>
>>  	iounmap(ivideo->video_vbase);
>> +
>> +	return status;
>>  }
>>
>>  static void __devinit
>> @@ -5648,6 +5653,7 @@ sisfb_post_xgi(struct pci_dev *pdev)
>>  		SiS_SetReg(SISSR, 0x14, bios[regb + 0xe0 + 8]);
>>
>>  	} else {
>> +		int err;
>>
>>  		/* Set default mode, don't clear screen */
>>  		ivideo->SiS_Pr.SiS_UseOEM = false;
>> @@ -5661,10 +5667,16 @@ sisfb_post_xgi(struct pci_dev *pdev)
>>
>>  		/* Disable read-cache */
>>  		SiS_SetRegAND(SISSR, 0x21, 0xdf);
>> -		sisfb_post_xgi_ramsize(ivideo);
>> +		err = sisfb_post_xgi_ramsize(ivideo);
>>  		/* Enable read-cache */
>>  		SiS_SetRegOR(SISSR, 0x21, 0x20);
>>
>> +		if (err) {
>> +			dev_err(&pdev->dev,
>> +				"%s: RAM size detection failed: %d\n",
>> +				__func__, err);
>> +			return 0;
>
>
> Are you sure you wish to return 0 when there is an error?

sisfb_post_xgi() returns zero on failure.

A.
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