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From 0df59f35855ec8c33bfe7e3ab6a9b592d6e20860 Mon Sep 17 00:00:00 2001
From: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Date: Sat, 16 Jan 2016 00:18:36 -0500
Subject: [PATCH 0697/1110] drm/amd/dal: Add simple logger of DPCD tx/rx
traffic.
Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Acked-by: Jordan Lazare <Jordan.Lazare@amd.com>
---
.../drm/amd/dal/amdgpu_dm/amdgpu_dm_mst_types.c | 55 +++++++++++++++++++++-
1 file changed, 53 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm_mst_types.c
index aeab396..fe5e366 100644
--- a/drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/dal/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -31,16 +31,59 @@
#include "dc.h"
#include "dc_helpers.h"
+/* #define TRACE_DPCD */
+
+#ifdef TRACE_DPCD
+#define SIDE_BAND_MSG(address) (address >= DP_SIDEBAND_MSG_DOWN_REQ_BASE && address < DP_SINK_COUNT_ESI)
+
+static inline char *side_band_msg_type_to_str(uint32_t address)
+{
+ static char str[10] = {0};
+
+ if (address < DP_SIDEBAND_MSG_UP_REP_BASE)
+ strcpy(str, "DOWN_REQ");
+ else if (address < DP_SIDEBAND_MSG_DOWN_REP_BASE)
+ strcpy(str, "UP_REP");
+ else if (address < DP_SIDEBAND_MSG_UP_REQ_BASE)
+ strcpy(str, "DOWN_REP");
+ else
+ strcpy(str, "UP_REQ");
+
+ return str;
+}
+
+void log_dpcd(uint8_t type,
+ uint32_t address,
+ uint8_t *data,
+ uint32_t size,
+ bool res)
+{
+ DRM_DEBUG_KMS("Op: %s, addr: %04x, SideBand Msg: %s, Op res: %s\n",
+ (type == DP_AUX_NATIVE_READ) ||
+ (type == DP_AUX_I2C_READ) ?
+ "Read" : "Write",
+ address,
+ SIDE_BAND_MSG(address) ?
+ side_band_msg_type_to_str(address) : "Nop",
+ res ? "OK" : "Fail");
+
+ if (res) {
+ print_hex_dump(KERN_INFO, "Body: ", DUMP_PREFIX_NONE, 16, 1, data, size, false);
+ }
+}
+#endif
+
static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
{
struct pci_dev *pdev = to_pci_dev(aux->dev);
struct drm_device *drm_dev = pci_get_drvdata(pdev);
struct amdgpu_device *adev = drm_dev->dev_private;
struct dc *dc = adev->dm.dc;
+ bool res;
switch (msg->request) {
case DP_AUX_NATIVE_READ:
- dc_read_dpcd(
+ res = dc_read_dpcd(
dc,
TO_DM_AUX(aux)->link_index,
msg->address,
@@ -48,7 +91,7 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg
msg->size);
break;
case DP_AUX_NATIVE_WRITE:
- dc_write_dpcd(
+ res = dc_write_dpcd(
dc,
TO_DM_AUX(aux)->link_index,
msg->address,
@@ -59,6 +102,14 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg
return 0;
}
+#ifdef TRACE_DPCD
+ log_dpcd(msg->request,
+ msg->address,
+ msg->buffer,
+ msg->size,
+ res);
+#endif
+
return msg->size;
}
--
2.7.4
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