From: Quentin Schulz quentin.schulz@free-electrons.com
dp_link_status and dp_get_lane_status are pretty generic and can be used for other means, so let's make it "public".
This adds drm_dp_link_status and 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 | 20 +++++++++++--------- include/drm/drm_dp_helper.h | 3 +++ 2 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index ffe14ec..3bc2e98 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -43,19 +43,21 @@ */
/* Helpers for DP link training */ -static u8 dp_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r) +u8 drm_dp_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r) { return link_status[r - DP_LANE0_1_STATUS]; } +EXPORT_SYMBOL(drm_dp_link_status);
-static u8 dp_get_lane_status(const u8 link_status[DP_LINK_STATUS_SIZE], +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); + u8 l = drm_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) @@ -64,12 +66,12 @@ bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE], u8 lane_status; int lane;
- lane_align = dp_link_status(link_status, - DP_LANE_ALIGN_STATUS_UPDATED); + lane_align = drm_dp_link_status(link_status, + DP_LANE_ALIGN_STATUS_UPDATED); 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 +86,7 @@ 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; } @@ -99,7 +101,7 @@ u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE], int s = ((lane & 1) ? DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT : DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT); - u8 l = dp_link_status(link_status, i); + u8 l = drm_dp_link_status(link_status, i);
return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT; } @@ -112,7 +114,7 @@ u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SI int s = ((lane & 1) ? DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT : DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT); - u8 l = dp_link_status(link_status, i); + u8 l = drm_dp_link_status(link_status, i);
return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT; } diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 62903ba..a488af0 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -935,6 +935,9 @@ #define DP_MST_LOGICAL_PORT_0 8
#define DP_LINK_STATUS_SIZE 6 + +u8 drm_dp_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r); +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],