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SubjectRe: [PATCH v4 1/3] [media] at91: add code to enable/disable ISI_MCK clock
From: Josh Wu <josh.wu@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@atmel.com>
[g.liakhovetski@gmx.de: fix label names]
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
---

Josh, I missed a slight hick-up in the previous version of this your
patch, so, I fixed it myself. Please confirm, that this version is ok with
you.

Thanks
Guennadi

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 7b89f00..c42ec6e 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;
@@ -763,6 +766,12 @@ 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);
@@ -776,6 +785,7 @@ 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;

@@ -859,7 +869,7 @@ 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);
@@ -897,6 +907,7 @@ 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);

@@ -915,7 +926,7 @@ 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;
@@ -944,6 +955,19 @@ 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,
@@ -1014,6 +1038,9 @@ 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__ */
--
1.7.2.5


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