linux-kernel - Re: [PATCH v3] pwm: i.MX: Avoid sample FIFO overflow for i.MX PWM version2

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Date:	Mon, 19 May 2014 14:52:03 +0800
From:	Liu Ying <Ying.Liu@...escale.com>
To:	Lothar Waßmann <LW@...O-electronics.de>
CC:	<linux-pwm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<thierry.reding@...il.com>, <s.hauer@...gutronix.de>,
	<shawn.guo@...escale.com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3] pwm: i.MX: Avoid sample FIFO overflow for i.MX PWM
 version2

Hi Lothar,

Thanks for your review.

On 05/19/2014 01:53 PM, Lothar Waßmann wrote:
> Hi,
> 
> Liu Ying wrote:
> [...]
>> @@ -30,6 +32,7 @@
>>  /* i.MX27, i.MX31, i.MX35 share the same PWM function block: */
>>  
>>  #define MX3_PWMCR                 0x00    /* PWM Control Register */
>> +#define MX3_PWMIR                 0x08    /* PWM Interrupt Register */
>>  #define MX3_PWMSAR                0x0C    /* PWM Sample Register */
>>  #define MX3_PWMPR                 0x10    /* PWM Period Register */
>>  #define MX3_PWMCR_PRESCALER(x)    (((x - 1) & 0xFFF) << 4)
>> @@ -38,7 +41,12 @@
>>  #define MX3_PWMCR_DBGEN			(1 << 22)
>>  #define MX3_PWMCR_CLKSRC_IPG_HIGH (2 << 16)
>>  #define MX3_PWMCR_CLKSRC_IPG      (1 << 16)
>> +#define MX3_PWMCR_SWR		  (1 << 3)
>>  #define MX3_PWMCR_EN              (1 << 0)
>> +#define MX3_PWMSR_ROV             (1 << 4)
>> +#define MX3_PWMIR_RIE             (1 << 1)
>> +
> You should decide whether to use tabs or spaces for indentation.
> And probably cleanup the indentation of the existing definitions to use
> all the same indentation style.

Ok, I will generate a separate patch to cleanup the indentation for
the existing register definitions of both i.MX PWMv1 and PWMv2.

> 
>> @@ -128,6 +160,13 @@ static int imx_pwm_config_v2(struct pwm_chip *chip,
>>  	else
>>  		period_cycles = 0;
>>  
>> +	if (!enable || duty_cycles == 0)
>> +		imx_pwm_software_reset_v2(chip);
>> +	else if (readl(imx->mmio_base + MX3_PWMSAR))
>> +		/* No rollover irq generated if duty peroid is zero. */
> typo: 'period'.

I will fix this.

> 
>> @@ -135,27 +174,55 @@ static int imx_pwm_config_v2(struct pwm_chip *chip,
>>  		MX3_PWMCR_DOZEEN | MX3_PWMCR_WAITEN |
>>  		MX3_PWMCR_DBGEN | MX3_PWMCR_CLKSRC_IPG_HIGH;
>>  
>> -	if (test_bit(PWMF_ENABLED, &pwm->flags))
>> +	if (enable)
>>  		cr |= MX3_PWMCR_EN;
>>  
>>  	writel(cr, imx->mmio_base + MX3_PWMCR);
>>  
>> +	if (enable && duty_cycles)
>> +		/* No rollover irq generated if duty peroid is zero. */
> dto.

I will fix this.

> 
> 
> Lothar Waßmann
> 

-- 
Liu Ying
--
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