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media: imx7-media-csi: Acquire a single clock 

As per the i.MX7D Reference Manual only the MCLK is used for
the CSI block, so only handle this single clock.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Tested-by: Rui Miguel Silva <rmfrfs@gmail.com>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Fabio Estevam 2019-05-04 10:40:20 -04:00 committed by Mauro Carvalho Chehab
parent 8756228744
commit 434d40df05
1 changed files with 8 additions and 43 deletions
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51
drivers/staging/media/imx/imx7-media-csi.c
View File

@ -152,8 +152,6 @@
#define CSI_CSICR18 0x48
#define CSI_CSICR19 0x4c
static const char * const imx7_csi_clk_id[] = {"axi", "dcic", "mclk"};
struct imx7_csi {
struct device *dev;
struct v4l2_subdev sd;
@ -180,9 +178,7 @@ struct imx7_csi {
void __iomem *regbase;
int irq;
int num_clks;
struct clk_bulk_data *clks;
struct clk *mclk;
/* active vb2 buffers to send to video dev sink */
struct imx_media_buffer *active_vb2_buf[2];
@ -204,20 +200,6 @@ struct imx7_csi {
#define imx7_csi_reg_write(_csi, _val, _offset) \
__raw_writel(_val, (_csi)->regbase + (_offset))
static void imx7_csi_clk_enable(struct imx7_csi *csi)
{
int ret;
ret = clk_bulk_prepare_enable(csi->num_clks, csi->clks);
if (ret < 0)
dev_err(csi->dev, "failed to enable clocks\n");
}
static void imx7_csi_clk_disable(struct imx7_csi *csi)
{
clk_bulk_disable_unprepare(csi->num_clks, csi->clks);
}
static void imx7_csi_hw_reset(struct imx7_csi *csi)
{
imx7_csi_reg_write(csi,
@ -413,7 +395,7 @@ static void imx7_csi_init(struct imx7_csi *csi)
if (csi->is_init)
return;
imx7_csi_clk_enable(csi);
clk_prepare_enable(csi->mclk);
imx7_csi_hw_reset(csi);
imx7_csi_init_interface(csi);
imx7_csi_dmareq_rff_enable(csi);
@ -429,7 +411,7 @@ static void imx7_csi_deinit(struct imx7_csi *csi)
imx7_csi_hw_reset(csi);
imx7_csi_init_interface(csi);
imx7_csi_dmareq_rff_disable(csi);
imx7_csi_clk_disable(csi);
clk_disable_unprepare(csi->mclk);
csi->is_init = false;
}
@ -1176,24 +1158,6 @@ static int imx7_csi_parse_endpoint(struct device *dev,
return fwnode_device_is_available(asd->match.fwnode) ? 0 : -EINVAL;
}
static int imx7_csi_clocks_get(struct imx7_csi *csi)
{
struct device *dev = csi->dev;
int i;
csi->num_clks = ARRAY_SIZE(imx7_csi_clk_id);
csi->clks = devm_kcalloc(dev, csi->num_clks, sizeof(*csi->clks),
GFP_KERNEL);
if (!csi->clks)
return -ENOMEM;
for (i = 0; i < csi->num_clks; i++)
csi->clks[i].id = imx7_csi_clk_id[i];
return devm_clk_bulk_get(dev, csi->num_clks, csi->clks);
}
static int imx7_csi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -1209,10 +1173,11 @@ static int imx7_csi_probe(struct platform_device *pdev)
csi->dev = dev;
ret = imx7_csi_clocks_get(csi);
if (ret < 0) {
dev_err(dev, "Failed to get clocks");
return -ENODEV;
csi->mclk = devm_clk_get(&pdev->dev, "mclk");
if (IS_ERR(csi->mclk)) {
ret = PTR_ERR(csi->mclk);
dev_err(dev, "Failed to get mclk: %d", ret);
return ret;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);