Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1564164 > unrolled thread

[PATCH v2 13/26] drm/rockchip: dw-mipi-dsi: allow commands in panel_disable

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  [PATCH v2 13/26] drm/rockchip: dw-mipi-dsi: allow commands in panel_disable John Keeping <john@metanate.com> - 2017-01-21 17:40 +0100
    Re: [PATCH v2 13/26] drm/rockchip: dw-mipi-dsi: allow commands in  panel_disable Chris Zhong <zyw@rock-chips.com> - 2017-01-22 09:40 +0100

#1564164 — [PATCH v2 13/26] drm/rockchip: dw-mipi-dsi: allow commands in panel_disable

Panel drivers may want to sent commands during the disable function, for
example MIPI_DCS_SET_DISPLAY_OFF before the video signal ends.  In order
to send commands we need to write to registers, so pclk must be enabled.

While changing this, remove the unnecessary code after the panel
unprepare call which seems to be a workaround for a specific panel and
thus belongs in the panel driver.

Signed-off-by: John Keeping <john@metanate.com>
---
Unchanged in v2
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 7ada6d8ed143..290282e86d16 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -846,24 +846,16 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
 {
 	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
 
-	drm_panel_disable(dsi->panel);
-
 	if (clk_prepare_enable(dsi->pclk)) {
 		dev_err(dsi->dev, "%s: Failed to enable pclk\n", __func__);
 		return;
 	}
 
+	drm_panel_disable(dsi->panel);
+
 	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE);
 	drm_panel_unprepare(dsi->panel);
-	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_VID_MODE);
 
-	/*
-	 * This is necessary to make sure the peripheral will be driven
-	 * normally when the display is enabled again later.
-	 */
-	msleep(120);
-
-	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE);
 	dw_mipi_dsi_disable(dsi);
 	clk_disable_unprepare(dsi->pclk);
 }
-- 
2.11.0.197.gb556de5.dirty

[toc] | [next] | [standalone]

#1564335 — Re: [PATCH v2 13/26] drm/rockchip: dw-mipi-dsi: allow commands in panel_disable

Hi John



On 01/22/2017 12:31 AM, John Keeping wrote:
> Panel drivers may want to sent commands during the disable function, for
> example MIPI_DCS_SET_DISPLAY_OFF before the video signal ends.  In order
> to send commands we need to write to registers, so pclk must be enabled.
>
> While changing this, remove the unnecessary code after the panel
> unprepare call which seems to be a workaround for a specific panel and
> thus belongs in the panel driver.
>
> Signed-off-by: John Keeping <john@metanate.com>
> ---
> Unchanged in v2
> ---
>   drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 12 ++----------
>   1 file changed, 2 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> index 7ada6d8ed143..290282e86d16 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> @@ -846,24 +846,16 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
>   {
>   	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
>   
> -	drm_panel_disable(dsi->panel);
> -
>   	if (clk_prepare_enable(dsi->pclk)) {
>   		dev_err(dsi->dev, "%s: Failed to enable pclk\n", __func__);
>   		return;
>   	}
>   
> +	drm_panel_disable(dsi->panel);
> +
>   	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE);
>   	drm_panel_unprepare(dsi->panel);
> -	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_VID_MODE);
>   
> -	/*
> -	 * This is necessary to make sure the peripheral will be driven
> -	 * normally when the display is enabled again later.
> -	 */
> -	msleep(120);
> -
> -	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE);
This workaround is from[0], I also think it should be deleted.

[0]
http://www.spinics.net/lists/dri-devel/msg77192.html


Reviewed-by: Chris Zhong <zyw@rock-chips.com>

>   	dw_mipi_dsi_disable(dsi);
>   	clk_disable_unprepare(dsi->pclk);
>   }

[toc] | [prev] | [standalone]

Back to top | Article view | linux.kernel

csiph-web