From mboxrd@z Thu Jan 1 00:00:00 1970 From: Damian Kos Subject: [PATCH 02/12] drm/dp: make dp_link_status and dp_get_lane_status usable from outside of the core Date: Tue, 3 Jul 2018 11:02:13 +0100 Message-ID: <1530612152-27555-3-git-send-email-dkos@cadence.com> References: <1530612152-27555-1-git-send-email-dkos@cadence.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1530612152-27555-1-git-send-email-dkos@cadence.com> Sender: linux-kernel-owner@vger.kernel.org To: David Airlie , Rob Herring , Mark Rutland , Gustavo Padovan , Maarten Lankhorst , Sean Paul , Sandy Huang , =?UTF-8?q?Heiko=20St=C3=BCbner?= , Damian Kos , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org Cc: ltyrala@cadence.com, pgaj@cadence.com, stelford@cadence.com, Quentin Schulz List-Id: devicetree@vger.kernel.org From: Quentin Schulz 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 Signed-off-by: Damian Kos --- 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], -- 1.7.1