[PATCH] [media] V4L: atmel-isi: add code to enable/disable ISI_MCK clock

[Nicolas Ferre]

On 11/28/2011 02:50 PM, Guennadi Liakhovetski :
> Hi Nicolas
> 
> On Mon, 28 Nov 2011, Nicolas Ferre wrote:
> 
>> From: Josh Wu <josh.wu at atmel.com>
>>
>> This patch
>> - add ISI_MCK clock enable/disable code.
>> - change field name in isi_platform_data structure
>>
>> Signed-off-by: Josh Wu <josh.wu at atmel.com>
>> [g.liakhovetski at gmx.de: fix label names]
>> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski at gmx.de>
>> Acked-by: Nicolas Ferre <nicolas.ferre at atmel.com>
> 
> Thanks for the ack. All patches, affecting drivers/media & include/media 
> should go via the media tree, I'll push this one along with others for 3.3 
> as appropriate.

That is just great!
On my side, I will take care of the device/board code through
at91/arm-soc trees...

Thanks, best regards,

>> ---
>> Guennadi,
>>
>> Here is the pach form Josh and yourself about the Atmel ISI driver
>> modifications. I have rebased it on top of 3.2-rc3 (and tested it on
>> linux-next also).
>> I plan to submit the board/device related patches (2-3/3 of this series) to
>> the arm-soc tree real soon. Do you whant me to include this one or can you
>> schedulle an inclusion in mainline for 3.3?
>>
>> Best regards,
>>
>>  drivers/media/video/atmel-isi.c |   31 +++++++++++++++++++++++++++++--
>>  include/media/atmel-isi.h       |    4 +++-
>>  2 files changed, 32 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/media/video/atmel-isi.c b/drivers/media/video/atmel-isi.c
>> index 8c775c5..5a7ab84 100644
>> --- a/drivers/media/video/atmel-isi.c
>> +++ b/drivers/media/video/atmel-isi.c
>> @@ -90,7 +90,10 @@ struct atmel_isi {
>>  	struct isi_dma_desc		dma_desc[MAX_BUFFER_NUM];
>>  
>>  	struct completion		complete;
>> +	/* ISI peripherial clock */
>>  	struct clk			*pclk;
>> +	/* ISI_MCK, feed to camera sensor to generate pixel clock */
>> +	struct clk			*mck;
>>  	unsigned int			irq;
>>  
>>  	struct isi_platform_data	*pdata;
>> @@ -766,6 +769,12 @@ static int isi_camera_add_device(struct soc_camera_device *icd)
>>  	if (ret)
>>  		return ret;
>>  
>> +	ret = clk_enable(isi->mck);
>> +	if (ret) {
>> +		clk_disable(isi->pclk);
>> +		return ret;
>> +	}
>> +
>>  	isi->icd = icd;
>>  	dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
>>  		 icd->devnum);
>> @@ -779,6 +788,7 @@ static void isi_camera_remove_device(struct soc_camera_device *icd)
>>  
>>  	BUG_ON(icd != isi->icd);
>>  
>> +	clk_disable(isi->mck);
>>  	clk_disable(isi->pclk);
>>  	isi->icd = NULL;
>>  
>> @@ -874,7 +884,7 @@ static int isi_camera_set_bus_param(struct soc_camera_device *icd, u32 pixfmt)
>>  
>>  	if (isi->pdata->has_emb_sync)
>>  		cfg1 |= ISI_CFG1_EMB_SYNC;
>> -	if (isi->pdata->isi_full_mode)
>> +	if (isi->pdata->full_mode)
>>  		cfg1 |= ISI_CFG1_FULL_MODE;
>>  
>>  	isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
>> @@ -912,6 +922,7 @@ static int __devexit atmel_isi_remove(struct platform_device *pdev)
>>  			isi->fb_descriptors_phys);
>>  
>>  	iounmap(isi->regs);
>> +	clk_put(isi->mck);
>>  	clk_put(isi->pclk);
>>  	kfree(isi);
>>  
>> @@ -930,7 +941,7 @@ static int __devinit atmel_isi_probe(struct platform_device *pdev)
>>  	struct isi_platform_data *pdata;
>>  
>>  	pdata = dev->platform_data;
>> -	if (!pdata || !pdata->data_width_flags) {
>> +	if (!pdata || !pdata->data_width_flags || !pdata->mck_hz) {
>>  		dev_err(&pdev->dev,
>>  			"No config available for Atmel ISI\n");
>>  		return -EINVAL;
>> @@ -959,6 +970,19 @@ static int __devinit atmel_isi_probe(struct platform_device *pdev)
>>  	INIT_LIST_HEAD(&isi->video_buffer_list);
>>  	INIT_LIST_HEAD(&isi->dma_desc_head);
>>  
>> +	/* Get ISI_MCK, provided by programmable clock or external clock */
>> +	isi->mck = clk_get(dev, "isi_mck");
>> +	if (IS_ERR_OR_NULL(isi->mck)) {
>> +		dev_err(dev, "Failed to get isi_mck\n");
>> +		ret = isi->mck ? PTR_ERR(isi->mck) : -EINVAL;
>> +		goto err_clk_get;
>> +	}
>> +
>> +	/* Set ISI_MCK's frequency, it should be faster than pixel clock */
>> +	ret = clk_set_rate(isi->mck, pdata->mck_hz);
>> +	if (ret < 0)
>> +		goto err_set_mck_rate;
>> +
>>  	isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
>>  				sizeof(struct fbd) * MAX_BUFFER_NUM,
>>  				&isi->fb_descriptors_phys,
>> @@ -1034,6 +1058,9 @@ err_alloc_ctx:
>>  			isi->p_fb_descriptors,
>>  			isi->fb_descriptors_phys);
>>  err_alloc_descriptors:
>> +err_set_mck_rate:
>> +	clk_put(isi->mck);
>> +err_clk_get:
>>  	kfree(isi);
>>  err_alloc_isi:
>>  	clk_put(isi->pclk);
>> diff --git a/include/media/atmel-isi.h b/include/media/atmel-isi.h
>> index 26cece5..6568230 100644
>> --- a/include/media/atmel-isi.h
>> +++ b/include/media/atmel-isi.h
>> @@ -110,10 +110,12 @@ struct isi_platform_data {
>>  	u8 hsync_act_low;
>>  	u8 vsync_act_low;
>>  	u8 pclk_act_falling;
>> -	u8 isi_full_mode;
>> +	u8 full_mode;
>>  	u32 data_width_flags;
>>  	/* Using for ISI_CFG1 */
>>  	u32 frate;
>> +	/* Using for ISI_MCK */
>> +	u32 mck_hz;
>>  };
>>  
>>  #endif /* __ATMEL_ISI_H__ */
>> -- 
>> 1.7.5.4
>>
> 
> ---
> Guennadi Liakhovetski, Ph.D.
> Freelance Open-Source Software Developer
> http://www.open-technology.de/
> 


-- 
Nicolas Ferre