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Sixteen discrete levels are supported, ranging from 12 uA to 36 uA. Defaults to 25 uA. Signed-off-by: Boerge Struempfel Acked-by: Conor Dooley --- .../devicetree/bindings/display/bridge/lontium,lt9211.yaml | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt921= 1.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt9211.ya= ml index 9a6e9b25d14a..381b69c761b8 100644 --- a/Documentation/devicetree/bindings/display/bridge/lontium,lt9211.yaml +++ b/Documentation/devicetree/bindings/display/bridge/lontium,lt9211.yaml @@ -31,6 +31,13 @@ properties: vccio-supply: description: Regulator for 1.8V IO power. =20 + drive-strength-microamp: + description: + LVDS TX output driver current. 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Dooley CC: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Boerge Struempfel Subject: [PATCH 2/2] drm/bridge: lt9211: Add drive-strength-microamp DT property Date: Tue, 12 May 2026 18:46:09 +0200 Message-ID: <20260512164609.3390700-3-bstruempfel@data-modul.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260512164609.3390700-1-bstruempfel@data-modul.com> References: <20260512164609.3390700-1-bstruempfel@data-modul.com> X-ClientProxiedBy: FR4P281CA0437.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:c6::7) To PAXPR01MB8486.eurprd01.prod.exchangelabs.com (2603:10a6:102:227::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAXPR01MB8486:EE_|VI0PR01MB11487:EE_ X-MS-Office365-Filtering-Correlation-Id: 8ed5856e-5140-4dcb-03fc-08deb04601dc X-LD-Processed: d72fb47f-f4be-4915-91c7-ebd53299157b,ExtAddr 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X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI0PR01MB11487 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 1Ls_AMD1zg8VdSjzZ8uwCp3D-xbYAerwhocPfqOOBkQ_1778604388 X-Mimecast-Originator: data-modul.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The LT9211 LVDS TX output driver current (RG_MLTX_HSDRV_ISEL) was previously hardcoded to 0x8 (~25 uA), which may not be optimal for all board layouts. The hardware supports 16 discrete current levels starting at 12.5 uA with a step of 1.5625 uA. These are exposed as rounded integer microamp values in the lookup table. Add support for the 'drive-strength-microamp' DT property. A lookup table maps the sixteen supported microamp values (12..36 uA) to the corresponding register field. Defaults to 25 uA when the property is absent, preserving the existing behaviour. Signed-off-by: Boerge Struempfel --- drivers/gpu/drm/bridge/lontium-lt9211.c | 28 ++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/brid= ge/lontium-lt9211.c index 03fc8fd10f20..402c639ac515 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9211.c +++ b/drivers/gpu/drm/bridge/lontium-lt9211.c @@ -40,6 +40,11 @@ /* DSI lane count - 0 means 4 lanes ; 1, 2, 3 means 1, 2, 3 lanes. */ #define REG_DSI_LANE_COUNT(n) ((n) & 3) =20 +/* Maps register value (index) to drive-strength-microamp DT property valu= e */ +static const u32 lt9211_hsdrv_microamp[] =3D { + 12, 14, 16, 17, 19, 20, 22, 23, 25, 27, 28, 30, 31, 33, 34, 36 +}; + struct lt9211 { struct drm_bridge bridge; struct device *dev; @@ -50,6 +55,7 @@ struct lt9211 { struct regulator *vccio; bool lvds_dual_link; bool lvds_dual_link_even_odd_swap; + u8 lvds_hsdrv_isel; }; =20 static const struct regmap_range lt9211_rw_ranges[] =3D { @@ -374,7 +380,8 @@ static int lt9211_configure_tx(struct lt9211 *ctx, bool= jeida, /* BIT(7) is LVDS dual-port */ { 0x823b, 0x38 | (ctx->lvds_dual_link ? BIT(7) : 0) }, { 0x823e, 0x92 }, - { 0x823f, 0x48 }, + /* bits 3:0: RG_MLTX_HSDRV_ISEL, LVDS TX driver current */ + { 0x823f, 0x40 | ctx->lvds_hsdrv_isel }, { 0x8240, 0x31 }, { 0x8243, 0x80 }, { 0x8244, 0x00 }, @@ -629,7 +636,9 @@ static int lt9211_parse_dt(struct lt9211 *ctx) struct device *dev =3D ctx->dev; struct drm_panel *panel; int dual_link; + u32 microamp; int ret; + int i; =20 ctx->vccio =3D devm_regulator_get(dev, "vccio"); if (IS_ERR(ctx->vccio)) @@ -666,6 +675,23 @@ static int lt9211_parse_dt(struct lt9211 *ctx) =20 ctx->panel_bridge =3D panel_bridge; =20 + ctx->lvds_hsdrv_isel =3D 8; /* default: 25 uA */ + ret =3D of_property_read_u32(dev->of_node, "drive-strength-microamp", + µamp); + if (!ret) { + for (i =3D 0; i < ARRAY_SIZE(lt9211_hsdrv_microamp); i++) { + if (lt9211_hsdrv_microamp[i] =3D=3D microamp) { + ctx->lvds_hsdrv_isel =3D i; + break; + } + } + if (i =3D=3D ARRAY_SIZE(lt9211_hsdrv_microamp)) { + dev_err(dev, "Invalid drive-strength-microamp value %u\n", + microamp); + return -EINVAL; + } + } + return 0; } =20 --=20 2.54.0