[PATCH 03/17] drm/tegra: dsi: Make FIFO depths host parameters

[Sean Paul]

On Mon, Nov 3, 2014 at 4:27 AM, Thierry Reding <thierry.reding at gmail.com> wrote:
> From: Thierry Reding <treding at nvidia.com>
>
> Rather than hardcoding them as macros, make the host and video FIFO
> depths parameters so that they can be more easily adjusted if a new
> generation of the Tegra SoC changes them.
>
> Signed-off-by: Thierry Reding <treding at nvidia.com>
> ---
>  drivers/gpu/drm/tegra/dsi.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
> index f7874458926a..584b771d8b2f 100644
> --- a/drivers/gpu/drm/tegra/dsi.c
> +++ b/drivers/gpu/drm/tegra/dsi.c
> @@ -26,9 +26,6 @@
>  #include "dsi.h"
>  #include "mipi-phy.h"
>
> -#define DSI_VIDEO_FIFO_DEPTH (1920 / 4)
> -#define DSI_HOST_FIFO_DEPTH 64
> -
>  struct tegra_dsi {
>         struct host1x_client client;
>         struct tegra_output output;
> @@ -54,6 +51,9 @@ struct tegra_dsi {
>
>         struct regulator *vdd;
>         bool enabled;
> +
> +       unsigned int video_fifo_depth;
> +       unsigned int host_fifo_depth;
>  };
>
>  static inline struct tegra_dsi *
> @@ -467,7 +467,7 @@ static int tegra_output_dsi_enable(struct tegra_output *output)
>                 DSI_CONTROL_SOURCE(dc->pipe);
>         tegra_dsi_writel(dsi, value, DSI_CONTROL);
>
> -       tegra_dsi_writel(dsi, DSI_VIDEO_FIFO_DEPTH, DSI_MAX_THRESHOLD);
> +       tegra_dsi_writel(dsi, dsi->video_fifo_depth, DSI_MAX_THRESHOLD);
>
>         value = DSI_HOST_CONTROL_HS | DSI_HOST_CONTROL_CS |
>                 DSI_HOST_CONTROL_ECC;
> @@ -843,6 +843,8 @@ static int tegra_dsi_probe(struct platform_device *pdev)
>                 return -ENOMEM;
>
>         dsi->output.dev = dsi->dev = &pdev->dev;
> +       dsi->video_fifo_depth = 1920;

This is not functionally equivalent to what was previously being set
(1920/4). Perhaps calling that out in the commit message might be
appropriate?

Sean

> +       dsi->host_fifo_depth = 64;
>
>         err = tegra_output_probe(&dsi->output);
>         if (err < 0)
> --
> 2.1.2
>