disp: msm: dp: adapt drm_dp_link_train* APIs for multiple SIs

Commit 1ef7ff2 ("disp: msm: dp: pass drm_dp_aux to drm_dp_link_train* APIs")
passes additional parameter drm_dp_aux to drm_dp_link_train APIs in order
to use drm_dbg_* within those functions.
This change put a macro in the drm_dp_link_train* APIs caller to handle API
changes for both kernel version 5.10 and version 5.15.

Change-Id: I9fd22e0effbe87b6cfecf72b38a10d74a2c0c5ea
Signed-off-by: Bruce Hoo <bingchua@codeaurora.org>

msm/dp/dp_ctrl.c

@@ -7,6 +7,7 @@
 #include <linux/completion.h>
 #include <linux/delay.h>
 #include <drm/drm_fixed.h>
+#include <linux/version.h>
 
 #include "dp_ctrl.h"
 #include "dp_debug.h"
@@ -372,7 +373,11 @@ static int dp_ctrl_link_training_1(struct dp_ctrl_private *ctrl)
 		if (ret)
 			break;
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0))
 		drm_dp_link_train_clock_recovery_delay(ctrl->aux->drm_aux, ctrl->panel->dpcd);
+#else
+		drm_dp_link_train_clock_recovery_delay(ctrl->panel->dpcd);
+#endif
 
 		ret = dp_ctrl_read_link_status(ctrl, link_status);
 		if (ret)
@@ -457,7 +462,11 @@ static int dp_ctrl_link_rate_down_shift(struct dp_ctrl_private *ctrl)
 static void dp_ctrl_clear_training_pattern(struct dp_ctrl_private *ctrl)
 {
 	dp_ctrl_update_sink_pattern(ctrl, 0);
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0))
 	drm_dp_link_train_channel_eq_delay(ctrl->aux->drm_aux, ctrl->panel->dpcd);
+#else
+	drm_dp_link_train_channel_eq_delay(ctrl->panel->dpcd);
+#endif
 }
 
 static int dp_ctrl_link_training_2(struct dp_ctrl_private *ctrl)
@@ -503,7 +512,11 @@ static int dp_ctrl_link_training_2(struct dp_ctrl_private *ctrl)
 		if (ret)
 			break;
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0))
 		drm_dp_link_train_channel_eq_delay(ctrl->aux->drm_aux, ctrl->panel->dpcd);
+#else
+		drm_dp_link_train_channel_eq_delay(ctrl->panel->dpcd);
+#endif
 
 		ret = dp_ctrl_read_link_status(ctrl, link_status);
 		if (ret)