Commit a792fa0e authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Tomi Valkeinen

drm: Clarify definition of the DRM_BUS_FLAG_(PIXDATA|SYNC)_* macros

The DRM_BUS_FLAG_PIXDATA_POSEDGE and DRM_BUS_FLAG_PIXDATA_NEGEDGE macros
and their DRM_BUS_FLAG_SYNC_* counterparts define on which pixel clock
edge data and sync signals are driven. They are however used in some
drivers to define on which pixel clock edge data and sync signals are
sampled, which should usually (but not always) be the opposite edge of
the driving edge. This creates confusion.

Create four new macros for both PIXDATA and SYNC that explicitly state
the driving and sampling edge in their name to remove the confusion. The
driving macros are defined as the opposite of the sampling macros to
made code simpler based on the assumption that the driving and sampling
edges are opposite.
Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Reviewed-by: default avatarStefan Agner <stefan@agner.ch>
Tested-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
parent 0dbfc396
...@@ -330,19 +330,47 @@ struct drm_display_info { ...@@ -330,19 +330,47 @@ struct drm_display_info {
#define DRM_BUS_FLAG_DE_LOW (1<<0) #define DRM_BUS_FLAG_DE_LOW (1<<0)
#define DRM_BUS_FLAG_DE_HIGH (1<<1) #define DRM_BUS_FLAG_DE_HIGH (1<<1)
/* drive data on pos. edge */
/*
* Don't use those two flags directly, use the DRM_BUS_FLAG_PIXDATA_DRIVE_*
* and DRM_BUS_FLAG_PIXDATA_SAMPLE_* variants to qualify the flags explicitly.
* The DRM_BUS_FLAG_PIXDATA_SAMPLE_* flags are defined as the opposite of the
* DRM_BUS_FLAG_PIXDATA_DRIVE_* flags to make code simpler, as signals are
* usually to be sampled on the opposite edge of the driving edge.
*/
#define DRM_BUS_FLAG_PIXDATA_POSEDGE (1<<2) #define DRM_BUS_FLAG_PIXDATA_POSEDGE (1<<2)
/* drive data on neg. edge */
#define DRM_BUS_FLAG_PIXDATA_NEGEDGE (1<<3) #define DRM_BUS_FLAG_PIXDATA_NEGEDGE (1<<3)
/* Drive data on rising edge */
#define DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE DRM_BUS_FLAG_PIXDATA_POSEDGE
/* Drive data on falling edge */
#define DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE DRM_BUS_FLAG_PIXDATA_NEGEDGE
/* Sample data on rising edge */
#define DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE DRM_BUS_FLAG_PIXDATA_NEGEDGE
/* Sample data on falling edge */
#define DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE DRM_BUS_FLAG_PIXDATA_POSEDGE
/* data is transmitted MSB to LSB on the bus */ /* data is transmitted MSB to LSB on the bus */
#define DRM_BUS_FLAG_DATA_MSB_TO_LSB (1<<4) #define DRM_BUS_FLAG_DATA_MSB_TO_LSB (1<<4)
/* data is transmitted LSB to MSB on the bus */ /* data is transmitted LSB to MSB on the bus */
#define DRM_BUS_FLAG_DATA_LSB_TO_MSB (1<<5) #define DRM_BUS_FLAG_DATA_LSB_TO_MSB (1<<5)
/* drive sync on pos. edge */
/*
* Similarly to the DRM_BUS_FLAG_PIXDATA_* flags, don't use these two flags
* directly, use one of the DRM_BUS_FLAG_SYNC_(DRIVE|SAMPLE)_* instead.
*/
#define DRM_BUS_FLAG_SYNC_POSEDGE (1<<6) #define DRM_BUS_FLAG_SYNC_POSEDGE (1<<6)
/* drive sync on neg. edge */
#define DRM_BUS_FLAG_SYNC_NEGEDGE (1<<7) #define DRM_BUS_FLAG_SYNC_NEGEDGE (1<<7)
/* Drive sync on rising edge */
#define DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE DRM_BUS_FLAG_SYNC_POSEDGE
/* Drive sync on falling edge */
#define DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE DRM_BUS_FLAG_SYNC_NEGEDGE
/* Sample sync on rising edge */
#define DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE DRM_BUS_FLAG_SYNC_NEGEDGE
/* Sample sync on falling edge */
#define DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE DRM_BUS_FLAG_SYNC_POSEDGE
/** /**
* @bus_flags: Additional information (like pixel signal polarity) for * @bus_flags: Additional information (like pixel signal polarity) for
* the pixel data on the bus, using DRM_BUS_FLAGS\_ defines. * the pixel data on the bus, using DRM_BUS_FLAGS\_ defines.
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment