linux-kernel - Re: [PATCH v2] drm/dsi: Implement set tear scanline

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Date:	Tue, 07 Jun 2016 09:54:06 +0300
From:	Jani Nikula <jani.nikula@...ux.intel.com>
To:	Vinay Simha BN <simhavcs@...il.com>
Cc:	Vinay Simha BN <simhavcs@...il.com>,
	Archit Taneja <archit.taneja@...il.com>,
	John Stultz <john.stultz@...aro.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	David Airlie <airlied@...ux.ie>,
	"open list\:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drm/dsi: Implement set tear scanline

On Mon, 06 Jun 2016, Vinay Simha BN <simhavcs@...il.com> wrote:
> Provide a small convenience wrapper that transmits
> a set_tear_scanline command.
>
> Also includes small build fixes from Sumit Semwal.
>
> Cc: Archit Taneja <archit.taneja@...il.com>
> Cc: John Stultz <john.stultz@...aro.org>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Cc: Sumit Semwal <sumit.semwal@...aro.org>
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> Signed-off-by: Vinay Simha BN <simhavcs@...il.com>
> --
> v1:
>   * helper function suggested by Thierry
>     for set_tear_scanline
> v2:
>   * one scanline parameter 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..c02d083 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));

You can just pass in payload, not &payload.

BR,
Jani.


> +	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