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Tue, 3 Jul 2018 12:03:27 +0200 Received: from lvloginb.cadence.com (10.165.177.11) by maileu3.global.cadence.com (10.160.88.99) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 3 Jul 2018 12:03:27 +0200 Received: from lvloginb.cadence.com (localhost [127.0.0.1]) by lvloginb.cadence.com (8.14.4/8.14.4) with ESMTP id w63A3BIg029148; Tue, 3 Jul 2018 11:03:11 +0100 Received: (from dkos@localhost) by lvloginb.cadence.com (8.14.4/8.14.4/Submit) id w63A3A3k029141; Tue, 3 Jul 2018 11:03:10 +0100 From: Damian Kos To: David Airlie , Rob Herring , "Mark Rutland" , Gustavo Padovan , Maarten Lankhorst , Sean Paul , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Damian Kos , , , , , CC: , , , "Quentin Schulz" Subject: [PATCH 03/12] drm/dp: add helpers for drm_dp_set_adjust_request_pre_emphasis and drm_dp_set_adjust_request_voltage Date: Tue, 3 Jul 2018 11:02:14 +0100 Message-ID: <1530612152-27555-4-git-send-email-dkos@cadence.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1530612152-27555-1-git-send-email-dkos@cadence.com> References: <1530612152-27555-1-git-send-email-dkos@cadence.com> MIME-Version: 1.0 X-OrganizationHeadersPreserved: maileu3.global.cadence.com X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:199.43.4.28; 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20:AKGE3ceuUc9Nfhcjw3QLI4n35vIARCb1zlrUWnjH3ykxMxUEGBgz7KuCSBwF1Ce0d7ay6s/9L5nbNYfgXKKZJZCVBpVckz+AQzlg1NchT3OyV7rWeZfel4yTKzmjlyCdJfb96aNvBwWeRKBjkuY7wWbK1iCVqpiYIEILIkoGlqVu+w35HNFLStt0mtKCmxt/OZxQYeXyOrI2hnQJX9oSPRKOdghhGwv3cu7pngSwiszwVcOOhC/r9FqSfBQAuTPA X-OriginatorOrg: cadence.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Jul 2018 10:03:15.4212 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 99189246-8203-496a-b747-08d5e0cc320a X-MS-Exchange-CrossTenant-Id: d36035c5-6ce6-4662-a3dc-e762e61ae4c9 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=d36035c5-6ce6-4662-a3dc-e762e61ae4c9; Ip=[199.43.4.28]; Helo=[rmmaillnx1.cadence.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR07MB4717 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Quentin Schulz We already have functions to get the adjust request voltage and pre-emphasis for a lane so it makes also sense to be able to set them so that we can then easily update them via a DPCD write. Add helpers for drm_dp_set_adjust_request_pre_emphasis and drm_dp_set_adjust_request_voltage that respectively set the pre-emphasis and voltage of a lane in the link status array. Signed-off-by: Quentin Schulz Signed-off-by: Damian Kos --- drivers/gpu/drm/drm_dp_helper.c | 28 ++++++++++++++++++++++++++++ include/drm/drm_dp_helper.h | 4 ++++ 2 files changed, 32 insertions(+), 0 deletions(-) -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 3bc2e98..ca2f469 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -120,6 +120,34 @@ u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SI } EXPORT_SYMBOL(drm_dp_get_adjust_request_pre_emphasis); +void drm_dp_set_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE], + int lane, u8 volt) +{ + int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1); + int s = ((lane & 1) ? + DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT : + DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT); + int idx = i - DP_LANE0_1_STATUS; + + link_status[idx] &= ~(DP_ADJUST_VOLTAGE_SWING_LANE0_MASK << s); + link_status[idx] |= volt << s; +} +EXPORT_SYMBOL(drm_dp_set_adjust_request_voltage); + +void drm_dp_set_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE], + int lane, u8 pre_emphasis) +{ + int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1); + int s = ((lane & 1) ? + DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT : + DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT); + int idx = i - DP_LANE0_1_STATUS; + + link_status[idx] &= ~(DP_ADJUST_PRE_EMPHASIS_LANE0_MASK << s); + link_status[idx] |= pre_emphasis << s; +} +EXPORT_SYMBOL(drm_dp_set_adjust_request_pre_emphasis); + void drm_dp_link_train_clock_recovery_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { if (dpcd[DP_TRAINING_AUX_RD_INTERVAL] == 0) udelay(100); diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index a488af0..6e64b2a 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -946,6 +946,10 @@ u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE], int lane); u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SIZE], int lane); +void drm_dp_set_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE], + int lane, u8 volt); +void drm_dp_set_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE], + int lane, u8 pre_emphasis); #define DP_BRANCH_OUI_HEADER_SIZE 0xc #define DP_RECEIVER_CAP_SIZE 0xf