linux-kernel - Re: [PATCH 1/3] drm/dsi: Add support for Turn on/Shutdown peripheral packets

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Date:	Sat, 21 Nov 2015 17:08:31 -0800
From:	Bjorn Andersson <bjorn@...o.se>
To:	David Airlie <airlied@...ux.ie>
Cc:	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] drm/dsi: Add support for Turn on/Shutdown peripheral packets

On Fri, Oct 30, 2015 at 5:38 PM,  <bjorn@...o.se> wrote:

Ping?

> From: Werner Johansson <werner.johansson@...ymobile.com>
>
> The MIPI_DSI_TURN_ON_PERIPHERAL and MIPI_DSI_SHUTDOWN_PERIPHERAL
> packets are required for some panels, one example being the
> Panasonic VVX10F034N00 panel.
>
> Signed-off-by: Werner Johansson <werner.johansson@...ymobile.com>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> ---
>  drivers/gpu/drm/drm_mipi_dsi.c | 47 ++++++++++++++++++++++++++++++++++++++++++
>  include/drm/drm_mipi_dsi.h     |  3 +++
>  2 files changed, 50 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
> index 2d5ca8ee..13b4a9c 100644
> --- a/drivers/gpu/drm/drm_mipi_dsi.c
> +++ b/drivers/gpu/drm/drm_mipi_dsi.c
> @@ -862,6 +862,53 @@ int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format)
>  }
>  EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
>
> +/**
> + * mipi_dsi_raw_short_write() - Sends a data-less short DSI packet
> + * @dsi: DSI peripheral device
> + * @type: Data Type of packet to send
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +static ssize_t mipi_dsi_raw_short_write(struct mipi_dsi_device *dsi, u8 type)
> +{
> +       u8 dummy[2] = { 0, 0 };
> +       struct mipi_dsi_msg msg = {
> +               .channel = dsi->channel,
> +               .tx_buf = dummy,
> +               .tx_len = sizeof(dummy),
> +               .type = type
> +       };
> +
> +       if (mipi_dsi_packet_format_is_short(type))
> +               return mipi_dsi_device_transfer(dsi, &msg);
> +       else
> +               return -1;
> +}
> +
> +/**
> + * mipi_dsi_turn_on_peripheral() - Sends Turn On Peripheral DSI command
> + * @dsi: DSI peripheral device
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +ssize_t mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi)
> +{
> +       return mipi_dsi_raw_short_write(dsi, MIPI_DSI_TURN_ON_PERIPHERAL);
> +}
> +EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral);
> +
> +/**
> + * mipi_dsi_shutdown_peripheral() - Sends Shutdown Peripheral DSI command
> + * @dsi: DSI peripheral device
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +ssize_t mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi)
> +{
> +       return mipi_dsi_raw_short_write(dsi, MIPI_DSI_SHUTDOWN_PERIPHERAL);
> +}
> +EXPORT_SYMBOL(mipi_dsi_shutdown_peripheral);
> +
>  static int mipi_dsi_drv_probe(struct device *dev)
>  {
>         struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index f1d8d0d..2e0f057 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -215,6 +215,9 @@ int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
>                              enum mipi_dsi_dcs_tear_mode mode);
>  int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
>
> +ssize_t mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi);
> +ssize_t mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi);
> +
>  /**
>   * struct mipi_dsi_driver - DSI driver
>   * @driver: device driver model driver
> --
> 2.3.2 (Apple Git-55)
>
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