diff mbox series

[PATCH/RFC,01/15] drm: Clarify definition of the DRM_BUS_FLAG_(PIXDATA|SYNC)_* macros

Message ID 20190306232345.23052-2-laurent.pinchart+renesas@ideasonboard.com (mailing list archive)
State New
Delegated to: Kieran Bingham
Headers show
Series R-Car DU: LVDS dual-link mode support | expand

Commit Message

Laurent Pinchart March 6, 2019, 11:23 p.m. UTC 
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: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
---
 include/drm/drm_connector.h | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

Comments

Kieran Bingham April 24, 2019, 8:15 a.m. UTC | #1 
Hi Laurent,

Thank you for the patch,

On 06/03/2019 23:23, Laurent Pinchart wrote:
> 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

s/made/make/

> edges are opposite.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> Acked-by: Linus Walleij <linus.walleij@linaro.org>

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>



> ---
>  include/drm/drm_connector.h | 36 ++++++++++++++++++++++++++++++++----
>  1 file changed, 32 insertions(+), 4 deletions(-)
> 
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 8fe22abb1e10..411c0eb4c00e 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -330,19 +330,47 @@ struct drm_display_info {
>  
>  #define DRM_BUS_FLAG_DE_LOW		(1<<0)
>  #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)
> -/* drive data on neg. edge */
>  #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 */
>  #define DRM_BUS_FLAG_DATA_MSB_TO_LSB	(1<<4)
>  /* data is transmitted LSB to MSB on the bus */
>  #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)
> -/* drive sync on neg. edge */
>  #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
>  	 * the pixel data on the bus, using DRM_BUS_FLAGS\_ defines.
>
diff mbox series

Patch

diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 8fe22abb1e10..411c0eb4c00e 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -330,19 +330,47 @@  struct drm_display_info {
 
 #define DRM_BUS_FLAG_DE_LOW		(1<<0)
 #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)
-/* drive data on neg. edge */
 #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 */
 #define DRM_BUS_FLAG_DATA_MSB_TO_LSB	(1<<4)
 /* data is transmitted LSB to MSB on the bus */
 #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)
-/* drive sync on neg. edge */
 #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
 	 * the pixel data on the bus, using DRM_BUS_FLAGS\_ defines.