Hi Hans,
Please refer to the comments below.
On 02/16/2013 10:28 AM, Hans Verkuil wrote:
> From: Hans Verkuil <hans.verk...@cisco.com>
>
> This just adds dv_timings support without modifying existing dv_preset
> support, although I had to refactor a little bit in order to share
> hdmiphy_find_conf() between the preset and timings code.
>
> Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
> Cc: Tomasz Stanislawski <t.stanisl...@samsung.com>
> Cc: Kyungmin Park <kyungmin.p...@samsung.com>
> ---
> drivers/media/platform/s5p-tv/hdmiphy_drv.c | 48
> ++++++++++++++++++++++-----
> 1 file changed, 39 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/media/platform/s5p-tv/hdmiphy_drv.c
> b/drivers/media/platform/s5p-tv/hdmiphy_drv.c
> index 80717ce..85b4211 100644
> --- a/drivers/media/platform/s5p-tv/hdmiphy_drv.c
> +++ b/drivers/media/platform/s5p-tv/hdmiphy_drv.c
> @@ -197,14 +197,9 @@ static unsigned long hdmiphy_preset_to_pixclk(u32 preset)
> return 0;
> }
>
> -static const u8 *hdmiphy_find_conf(u32 preset, const struct hdmiphy_conf
> *conf)
> +static const u8 *hdmiphy_find_conf(unsigned long pixclk,
> + const struct hdmiphy_conf *conf)
> {
> - unsigned long pixclk;
> -
> - pixclk = hdmiphy_preset_to_pixclk(preset);
> - if (!pixclk)
> - return NULL;
> -
> for (; conf->pixclk; ++conf)
> if (conf->pixclk == pixclk)
> return conf->data;
> @@ -220,15 +215,49 @@ static int hdmiphy_s_power(struct v4l2_subdev *sd, int
> on)
> static int hdmiphy_s_dv_preset(struct v4l2_subdev *sd,
> struct v4l2_dv_preset *preset)
> {
> - const u8 *data;
> + const u8 *data = NULL;
> u8 buffer[32];
> int ret;
> struct hdmiphy_ctx *ctx = sd_to_ctx(sd);
> struct i2c_client *client = v4l2_get_subdevdata(sd);
> + unsigned long pixclk;
> struct device *dev = &client->dev;
>
> dev_info(dev, "s_dv_preset(preset = %d)\n", preset->preset);
> - data = hdmiphy_find_conf(preset->preset, ctx->conf_tab);
> +
> + pixclk = hdmiphy_preset_to_pixclk(preset->preset);
Just nitpicking.
The pixclk might be 0 is the preset is not supported hdmiphy.
For some platforms not all frequencies are supported.
Anyway, if pixclk is 0 then hdmiphy_find_conf will detect it.
> + data = hdmiphy_find_conf(pixclk, ctx->conf_tab);
> + if (!data) {
> + dev_err(dev, "format not supported\n");
> + return -EINVAL;
> + }
> +
> + /* storing configuration to the device */
> + memcpy(buffer, data, 32);
> + ret = i2c_master_send(client, buffer, 32);
> + if (ret != 32) {
> + dev_err(dev, "failed to configure HDMIPHY via I2C\n");
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +static int hdmiphy_s_dv_timings(struct v4l2_subdev *sd,
> + struct v4l2_dv_timings *timings)
> +{
> + const u8 *data;
> + u8 buffer[32];
> + int ret;
> + struct hdmiphy_ctx *ctx = sd_to_ctx(sd);
> + struct i2c_client *client = v4l2_get_subdevdata(sd);
> + struct device *dev = &client->dev;
> + unsigned long pixclk = timings->bt.pixelclock;
> +
> + dev_info(dev, "s_dv_timings\n");
Using test against V4L2_DV_FL_REDUCED_FPS and 74250000 looks little hacky to me.
Why there is no such a check for 148500000 and 27000000 (REDUCED -> INCREASED?).
Maybe it will be better to past both timings->bt.pixelclock and
timings->bt.flags
as parameters for hdmiphy_find_conf function. The hdmiphy_find_conf could
perform pixclk adjustment or some fallback policy based on the flags.
> + if ((timings->bt.flags & V4L2_DV_FL_REDUCED_FPS) && pixclk == 74250000)
> + pixclk = 74176000;
> + data = hdmiphy_find_conf(pixclk, ctx->conf_tab);
> if (!data) {
> dev_err(dev, "format not supported\n");
> return -EINVAL;
> @@ -271,6 +300,7 @@ static const struct v4l2_subdev_core_ops hdmiphy_core_ops
> = {
>
> static const struct v4l2_subdev_video_ops hdmiphy_video_ops = {
> .s_dv_preset = hdmiphy_s_dv_preset,
> + .s_dv_timings = hdmiphy_s_dv_timings,
> .s_stream = hdmiphy_s_stream,
> };
>
>
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