linux-kernel - Re: [PATCH 2/4] pch_dma: fix dma direction issue for ML7213 IOH video-in

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Message-ID: <1304317013.1589.5.camel@vkoul-udesk3>
Date:	Mon, 02 May 2011 11:46:53 +0530
From:	"Koul, Vinod" <vinod.koul@...el.com>
To:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org, qi.wang@...el.com,
	yong.y.wang@...el.com, joel.clark@...el.com,
	kok.howg.ewe@...el.com, toshiharu-linux@....okisemi.com
Subject: Re: [PATCH 2/4] pch_dma: fix dma direction issue for ML7213 IOH
 video-in

On Tue, 2011-04-26 at 19:05 +0900, Tomoya MORINAGA wrote:
> Currently, even-channel number is set as tx direction and odd is set as rx.
> However, though video-in uses ch6, the direction is not tx but rx.
> This patch sets video-in's DMA direction correctly.
> 
> Signed-off-by: Tomoya MORINAGA <tomoya-linux@....okisemi.com>
> ---
>  drivers/dma/pch_dma.c |   23 ++++++++++++++---------
>  1 files changed, 14 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/dma/pch_dma.c b/drivers/dma/pch_dma.c
> index 9421ed5..cd7bf83 100644
> --- a/drivers/dma/pch_dma.c
> +++ b/drivers/dma/pch_dma.c
> @@ -59,6 +59,14 @@
>  #define DMA_DESC_FOLLOW_WITHOUT_IRQ	0x2
>  #define DMA_DESC_FOLLOW_WITH_IRQ	0x3
>  
> +/* PCI Device ID of DMA device */
> +#define PCI_VENDOR_ID_ROHM             0x10DB
> +#define PCI_DEVICE_ID_EG20T_PCH_DMA_8CH        0x8810
> +#define PCI_DEVICE_ID_EG20T_PCH_DMA_4CH        0x8815
> +#define PCI_DEVICE_ID_ML7213_DMA1_8CH	0x8026
> +#define PCI_DEVICE_ID_ML7213_DMA2_8CH	0x802B
> +#define PCI_DEVICE_ID_ML7213_DMA3_4CH	0x8034
> +
>  #define MAX_CHAN_NR			8
These additions does seem to match the patch description, Can you split
them appropriately...
>  
>  static unsigned int init_nr_desc_per_channel = 64;
> @@ -853,7 +861,12 @@ static int __devinit pch_dma_probe(struct pci_dev *pdev,
>  
>  		pd_chan->membase = &regs->desc[i];
>  
> -		pd_chan->dir = (i % 2) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
> +		/* D10:F0 DMA ch6 "video input" is rx direction */
> +		if ((id->device == PCI_DEVICE_ID_ML7213_DMA1_8CH) && (i == 6))
> +			pd_chan->dir = DMA_FROM_DEVICE;
This kind of initialization is wrong....
Will you change again if video channel assignments change...
You should use the direction field in prep_xxx calls for setting this
> +		else
> +			pd_chan->dir = (i % 2) ? DMA_FROM_DEVICE : \
> +								DMA_TO_DEVICE;
>  
>  		spin_lock_init(&pd_chan->lock);
>  
> @@ -925,14 +938,6 @@ static void __devexit pch_dma_remove(struct pci_dev *pdev)
>  	}
>  }
>  
> -/* PCI Device ID of DMA device */
> -#define PCI_VENDOR_ID_ROHM             0x10DB
> -#define PCI_DEVICE_ID_EG20T_PCH_DMA_8CH        0x8810
> -#define PCI_DEVICE_ID_EG20T_PCH_DMA_4CH        0x8815
> -#define PCI_DEVICE_ID_ML7213_DMA1_8CH	0x8026
> -#define PCI_DEVICE_ID_ML7213_DMA2_8CH	0x802B
> -#define PCI_DEVICE_ID_ML7213_DMA3_4CH	0x8034
????

> -
>  static const struct pci_device_id pch_dma_id_table[] = {
>  	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_8CH), 8 },
>  	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_4CH), 4 },


-- 
~Vinod

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