linux-kernel - Re: [PATCH] BLACKFIN MEDIA DRIVER: rewrite the blackfin style of read/write into common style

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Date:	Fri, 16 Jan 2015 12:34:42 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Hao Liang <hliang1025@...il.com>, scott.jiang.linux@...il.com,
	mchehab@....samsung.com
CC:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Hao.Liang@...log.com, adi-buildroot-devel@...ts.sourceforge.net
Subject: Re: [PATCH] BLACKFIN MEDIA DRIVER: rewrite the blackfin style of
 read/write into common style

Hi Hao,

Why would you do this? read/writew() is AFAICT not the same as bfin_read/write16
(defined in arch/blackfin/include/asm/def_LPBlackfin.h). And all other blackfin
sources I've seen all use bfin_read/write.

So unless there is a good reason for this change I am not going to accept this.

Regards,

	Hans

On 01/14/2015 07:57 AM, Hao Liang wrote:
> Signed-off-by: Hao Liang <hliang1025@...il.com>
> ---
>  drivers/media/platform/blackfin/ppi.c |   72 ++++++++++++++++-----------------
>  1 file changed, 35 insertions(+), 37 deletions(-)
> 
> diff --git a/drivers/media/platform/blackfin/ppi.c b/drivers/media/platform/blackfin/ppi.c
> index cff63e5..de4b5c7 100644
> --- a/drivers/media/platform/blackfin/ppi.c
> +++ b/drivers/media/platform/blackfin/ppi.c
> @@ -20,6 +20,7 @@
>  #include <linux/module.h>
>  #include <linux/slab.h>
>  #include <linux/platform_device.h>
> +#include <linux/io.h>
>  
>  #include <asm/bfin_ppi.h>
>  #include <asm/blackfin.h>
> @@ -59,10 +60,10 @@ static irqreturn_t ppi_irq_err(int irq, void *dev_id)
>  		/* register on bf561 is cleared when read 
>  		 * others are W1C
>  		 */
> -		status = bfin_read16(&reg->status);
> +		status = readw(&reg->status);
>  		if (status & 0x3000)
>  			ppi->err = true;
> -		bfin_write16(&reg->status, 0xff00);
> +		writew(0xff00, &reg->status);
>  		break;
>  	}
>  	case PPI_TYPE_EPPI:
> @@ -70,10 +71,10 @@ static irqreturn_t ppi_irq_err(int irq, void *dev_id)
>  		struct bfin_eppi_regs *reg = info->base;
>  		unsigned short status;
>  
> -		status = bfin_read16(&reg->status);
> +		status = readw(&reg->status);
>  		if (status & 0x2)
>  			ppi->err = true;
> -		bfin_write16(&reg->status, 0xffff);
> +		writew(0xffff, &reg->status);
>  		break;
>  	}
>  	case PPI_TYPE_EPPI3:
> @@ -81,10 +82,10 @@ static irqreturn_t ppi_irq_err(int irq, void *dev_id)
>  		struct bfin_eppi3_regs *reg = info->base;
>  		unsigned long stat;
>  
> -		stat = bfin_read32(&reg->stat);
> +		stat = readl(&reg->stat);
>  		if (stat & 0x2)
>  			ppi->err = true;
> -		bfin_write32(&reg->stat, 0xc0ff);
> +		writel(0xc0ff, &reg->stat);
>  		break;
>  	}
>  	default:
> @@ -139,26 +140,25 @@ static int ppi_start(struct ppi_if *ppi)
>  	case PPI_TYPE_PPI:
>  	{
>  		struct bfin_ppi_regs *reg = info->base;
> -		bfin_write16(&reg->control, ppi->ppi_control);
> +		writew(ppi->ppi_control, &reg->control);
>  		break;
>  	}
>  	case PPI_TYPE_EPPI:
>  	{
>  		struct bfin_eppi_regs *reg = info->base;
> -		bfin_write32(&reg->control, ppi->ppi_control);
> +		writel(ppi->ppi_control, &reg->control);
>  		break;
>  	}
>  	case PPI_TYPE_EPPI3:
>  	{
>  		struct bfin_eppi3_regs *reg = info->base;
> -		bfin_write32(&reg->ctl, ppi->ppi_control);
> +		writel(ppi->ppi_control, &reg->ctl);
>  		break;
>  	}
>  	default:
>  		return -EINVAL;
>  	}
>  
> -	SSYNC();
>  	return 0;
>  }
>  
> @@ -172,19 +172,19 @@ static int ppi_stop(struct ppi_if *ppi)
>  	case PPI_TYPE_PPI:
>  	{
>  		struct bfin_ppi_regs *reg = info->base;
> -		bfin_write16(&reg->control, ppi->ppi_control);
> +		writew(ppi->ppi_control, &reg->control);
>  		break;
>  	}
>  	case PPI_TYPE_EPPI:
>  	{
>  		struct bfin_eppi_regs *reg = info->base;
> -		bfin_write32(&reg->control, ppi->ppi_control);
> +		writel(ppi->ppi_control, &reg->control);
>  		break;
>  	}
>  	case PPI_TYPE_EPPI3:
>  	{
>  		struct bfin_eppi3_regs *reg = info->base;
> -		bfin_write32(&reg->ctl, ppi->ppi_control);
> +		writel(ppi->ppi_control, &reg->ctl);
>  		break;
>  	}
>  	default:
> @@ -195,7 +195,6 @@ static int ppi_stop(struct ppi_if *ppi)
>  	clear_dma_irqstat(info->dma_ch);
>  	disable_dma(info->dma_ch);
>  
> -	SSYNC();
>  	return 0;
>  }
>  
> @@ -242,9 +241,9 @@ static int ppi_set_params(struct ppi_if *ppi, struct ppi_params *params)
>  		if (params->ppi_control & DMA32)
>  			dma32 = 1;
>  
> -		bfin_write16(&reg->control, ppi->ppi_control);
> -		bfin_write16(&reg->count, samples_per_line - 1);
> -		bfin_write16(&reg->frame, params->frame);
> +		writew(ppi->ppi_control, &reg->control);
> +		writew(samples_per_line - 1, &reg->count);
> +		writew(params->frame, &reg->frame);
>  		break;
>  	}
>  	case PPI_TYPE_EPPI:
> @@ -255,13 +254,13 @@ static int ppi_set_params(struct ppi_if *ppi, struct ppi_params *params)
>  			|| (params->ppi_control & 0x38000) > DLEN_16)
>  			dma32 = 1;
>  
> -		bfin_write32(&reg->control, ppi->ppi_control);
> -		bfin_write16(&reg->line, samples_per_line);
> -		bfin_write16(&reg->frame, params->frame);
> -		bfin_write16(&reg->hdelay, hdelay);
> -		bfin_write16(&reg->vdelay, params->vdelay);
> -		bfin_write16(&reg->hcount, hcount);
> -		bfin_write16(&reg->vcount, params->height);
> +		writel(ppi->ppi_control, &reg->control);
> +		writew(samples_per_line, &reg->line);
> +		writew(params->frame, &reg->frame);
> +		writew(hdelay, &reg->hdelay);
> +		writew(params->vdelay, &reg->vdelay);
> +		writew(hcount, &reg->hcount);
> +		writew(params->height, &reg->vcount);
>  		break;
>  	}
>  	case PPI_TYPE_EPPI3:
> @@ -272,15 +271,15 @@ static int ppi_set_params(struct ppi_if *ppi, struct ppi_params *params)
>  			|| (params->ppi_control & 0x70000) > DLEN_16)
>  			dma32 = 1;
>  
> -		bfin_write32(&reg->ctl, ppi->ppi_control);
> -		bfin_write32(&reg->line, samples_per_line);
> -		bfin_write32(&reg->frame, params->frame);
> -		bfin_write32(&reg->hdly, hdelay);
> -		bfin_write32(&reg->vdly, params->vdelay);
> -		bfin_write32(&reg->hcnt, hcount);
> -		bfin_write32(&reg->vcnt, params->height);
> +		writel(ppi->ppi_control, &reg->ctl);
> +		writel(samples_per_line, &reg->line);
> +		writel(params->frame, &reg->frame);
> +		writel(hdelay, &reg->hdly);
> +		writel(params->vdelay, &reg->vdly);
> +		writel(hcount, &reg->hcnt);
> +		writel(params->height, &reg->vcnt);
>  		if (params->int_mask)
> -			bfin_write32(&reg->imsk, params->int_mask & 0xFF);
> +			writel(params->int_mask & 0xFF, &reg->imsk);
>  		if (ppi->ppi_control & PORT_DIR) {
>  			u32 hsync_width, vsync_width, vsync_period;
>  
> @@ -288,10 +287,10 @@ static int ppi_set_params(struct ppi_if *ppi, struct ppi_params *params)
>  					* params->bpp / params->dlen;
>  			vsync_width = params->vsync * samples_per_line;
>  			vsync_period = samples_per_line * params->frame;
> -			bfin_write32(&reg->fs1_wlhb, hsync_width);
> -			bfin_write32(&reg->fs1_paspl, samples_per_line);
> -			bfin_write32(&reg->fs2_wlvb, vsync_width);
> -			bfin_write32(&reg->fs2_palpf, vsync_period);
> +			writel(hsync_width, &reg->fs1_wlhb);
> +			writel(samples_per_line, &reg->fs1_paspl);
> +			writel(vsync_width, &reg->fs2_wlvb);
> +			writel(vsync_period, &reg->fs2_palpf);
>  		}
>  		break;
>  	}
> @@ -313,7 +312,6 @@ static int ppi_set_params(struct ppi_if *ppi, struct ppi_params *params)
>  	set_dma_y_count(info->dma_ch, params->height);
>  	set_dma_config(info->dma_ch, dma_config);
>  
> -	SSYNC();
>  	return 0;
>  }
>  
> 

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