On Tue, 07 Jun 2016, Vinay Simha BN <simhavcs@xxxxxxxxx> wrote:
> Provide a small convenience wrapper that transmits
> a set_tear_scanline command.
>
> Cc: Archit Taneja <archit.taneja@xxxxxxxxx>
> Cc: John Stultz <john.stultz@xxxxxxxxxx>
> Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
> Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Signed-off-by: Vinay Simha BN <simhavcs@xxxxxxxxx>
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
>
> --
> v1:
> * helper function suggested by Thierry
> for set_tear_scanline
> * Also includes small build fixes from Sumit Semwal.
>
> v2:
> * one scanline parameter suggested by jani
>
> v3:
> * passing the payload properly as suggested by jani
> --
> ---
> drivers/gpu/drm/drm_mipi_dsi.c | 22 ++++++++++++++++++++++
> include/drm/drm_mipi_dsi.h | 1 +
> 2 files changed, 23 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
> index f5d8083..7938ce7 100644
> --- a/drivers/gpu/drm/drm_mipi_dsi.c
> +++ b/drivers/gpu/drm/drm_mipi_dsi.c
> @@ -983,6 +983,28 @@ int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
> EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);
>
> /**
> + * mipi_dsi_set_tear_scanline() - turn on the display module's Tearing Effect
> + * output signal on the TE signal line when display module reaches line N
> + * defined by STS[n:0].
> + * @dsi: DSI peripheral device
> + * @param: STS[10:0]
> + * Return: 0 on success or a negative error code on failure
> + */
> +int mipi_dsi_set_tear_scanline(struct mipi_dsi_device *dsi, u16 param)
> +{
> + u8 payload[3] = { MIPI_DCS_SET_TEAR_SCANLINE, param >> 8,
> + param & 0xff };
> + ssize_t err;
> +
> + err = mipi_dsi_generic_write(dsi, payload, sizeof(payload));
> + if (err < 0)
> + return err;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(mipi_dsi_set_tear_scanline);
> +
> +/**
> * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
> * data used by the interface
> * @dsi: DSI peripheral device
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index 7a9840f..ec55285 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -263,6 +263,7 @@ int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
> u16 end);
> int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
> u16 end);
> +int mipi_dsi_set_tear_scanline(struct mipi_dsi_device *dsi, u16 param);
> int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi);
> int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
> enum mipi_dsi_dcs_tear_mode mode);
--
Jani Nikula, Intel Open Source Technology Center
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