diff mbox series

[v9,1/3] drm/dsi: transfer DSI HS packets ending at the same time

Message ID 20220114092110.12137-2-rex-bc.chen@mediatek.com (mailing list archive)
State New, archived
Headers show
Series force hsa hbp hfp packets multiple of lanenum to avoid screen shift | expand

Commit Message

Rex-BC Chen (陳柏辰) Jan. 14, 2022, 9:21 a.m. UTC 
Since a HS transmission is composed of an arbitrary number
of bytes that may not be an integer multiple of lanes, some
lanes may run out of data before others.
(Defined in 6.1.3 of mipi_DSI_specification_v.01-02-00)

However, for some DSI RX devices (for example, anx7625),
there is a limitation that packet number should be the same
on all DSI lanes. In other words, they need to end a HS at
the same time.

Because this limitation is for some specific DSI RX devices,
it is more reasonable to put the enable control in these
DSI RX drivers. If DSI TX driver knows the information,
they can adjust the setting for this situation.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
---
 include/drm/drm_mipi_dsi.h | 2 ++
 1 file changed, 2 insertions(+)

Comments

AngeloGioacchino Del Regno Jan. 14, 2022, 9:59 a.m. UTC | #1 
Il 14/01/22 10:21, Rex-BC Chen ha scritto:
> Since a HS transmission is composed of an arbitrary number
> of bytes that may not be an integer multiple of lanes, some
> lanes may run out of data before others.
> (Defined in 6.1.3 of mipi_DSI_specification_v.01-02-00)
> 
> However, for some DSI RX devices (for example, anx7625),
> there is a limitation that packet number should be the same
> on all DSI lanes. In other words, they need to end a HS at
> the same time.
> 
> Because this limitation is for some specific DSI RX devices,
> it is more reasonable to put the enable control in these
> DSI RX drivers. If DSI TX driver knows the information,
> they can adjust the setting for this situation.
> 
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>

Acked-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

> ---
>   include/drm/drm_mipi_dsi.h | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index 147e51b6d241..342dfe5a0874 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -137,6 +137,8 @@ struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node);
>   #define MIPI_DSI_CLOCK_NON_CONTINUOUS	BIT(10)
>   /* transmit data in low power */
>   #define MIPI_DSI_MODE_LPM		BIT(11)
> +/* transmit data ending in the same hsync for all lanes */
> +#define MIPI_DSI_HS_PKT_END_ALIGNED	BIT(12)
>   
>   enum mipi_dsi_pixel_format {
>   	MIPI_DSI_FMT_RGB888,
>
diff mbox series

Patch

diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 147e51b6d241..342dfe5a0874 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -137,6 +137,8 @@  struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node);
 #define MIPI_DSI_CLOCK_NON_CONTINUOUS	BIT(10)
 /* transmit data in low power */
 #define MIPI_DSI_MODE_LPM		BIT(11)
+/* transmit data ending in the same hsync for all lanes */
+#define MIPI_DSI_HS_PKT_END_ALIGNED	BIT(12)
 
 enum mipi_dsi_pixel_format {
 	MIPI_DSI_FMT_RGB888,