[PATCH v4 3/5] drm/dp: make dp_get_lane_status usable from outside of the core

Damian Kos
2018-09-20T14:54:38Z

From: Quentin Schulz <quentin.schulz@free-electrons.com>

dp_get_lane_status is pretty generic and can be used for other means,
so let's make it "public".

This adds drm_dp_get_lane_status to the header file and add the appropriate
EXPORT_SYMBOL for it so that it can be used by other drivers, be they compiled
built-in or as modules.

Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Signed-off-by: Damian Kos <dkos@cadence.com>
---
drivers/gpu/drm/drm_dp_helper.c | 9 +++++----
include/drm/drm_dp_helper.h | 2 ++
2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 735ebde5c2f0..169db52f92f5 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -48,14 +48,15 @@ static u8 dp_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r)
return link_status[r - DP_LANE0_1_STATUS];
}

-static u8 dp_get_lane_status(const u8 link_status[DP_LINK_STATUS_SIZE],
- int lane)
+u8 drm_dp_get_lane_status(const u8 link_status[DP_LINK_STATUS_SIZE],
+ int lane)
{
int i = DP_LANE0_1_STATUS + (lane >> 1);
int s = (lane & 1) * 4;
u8 l = dp_link_status(link_status, i);
return (l >> s) & 0xf;
}
+EXPORT_SYMBOL(drm_dp_get_lane_status);

bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
int lane_count)
@@ -69,7 +70,7 @@ bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
return false;
for (lane = 0; lane < lane_count; lane++) {
- lane_status = dp_get_lane_status(link_status, lane);
+ lane_status = drm_dp_get_lane_status(link_status, lane);
if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS)
return false;
}
@@ -84,7 +85,7 @@ bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
u8 lane_status;

for (lane = 0; lane < lane_count; lane++) {
- lane_status = dp_get_lane_status(link_status, lane);
+ lane_status = drm_dp_get_lane_status(link_status, lane);
if ((lane_status & DP_LANE_CR_DONE) == 0)
return false;
}
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 698082a02b97..973d2fda9654 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -952,6 +952,8 @@
#define DP_MST_LOGICAL_PORT_0 8

#define DP_LINK_STATUS_SIZE 6
+
+u8 drm_dp_get_lane_status(const u8 link_status[DP_LINK_STATUS_SIZE], int lane);
bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
int lane_count);
bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
--
2.17.1