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dp: Allow differentiate between XDptx and XDprx structures from a void *.

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The XDp_Config structure is moved to the top of the instance structure for
XDptx. The XDprx structure, once implemented, will keep the XDp_Config structure
as the first member.

This allows functions to accept a void * argument and determine whether the
pointed structure is of type XDptx or XDprx by accessing the XDp_Config member's
IsRx member.

The reason this works is because XDp_Config is the first member in the
structure's order so the configuration structure will be placed in the same
relative location for both the XDptx and XDprx structures.

Signed-off-by: Andrei-Liviu Simion <andrei.simion@xilinx.com>
This commit is contained in:
Andrei-Liviu Simion 2015-01-09 14:52:23 -08:00 • committed by Nava kishore Manne
parent 81cb2fe913
commit 0a72981dcd
1 changed files with 5 additions and 3 deletions
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8
XilinxProcessorIPLib/drivers/dp/src/xdptx.h
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@ -517,6 +517,11 @@ typedef void (*XDptx_HpdPulseHandler)(void *InstancePtr);
* this type is then passed to the driver API functions.
*/
typedef struct {
XDp_Config Config; /**< Configuration structure for
the DisplayPort TX
core. It is important to
keep this member first
in the XDptx order. */
u32 MstEnable; /**< Multi-stream transport
(MST) mode. Enables
functionality, allowing
@ -528,9 +533,6 @@ typedef struct {
u8 TrainAdaptive; /**< Downshift lane count and
link rate if necessary
during training. */
XDp_Config Config; /**< Configuration structure for
the DisplayPort TX
core. */
XDptx_SinkConfig RxConfig; /**< Configuration structure for
the RX device. */
XDptx_LinkConfig LinkConfig; /**< Configuration structure for