kernel/linux.git/drivers/gpu/drm/bridge, branch v6.1.175

drm/bridge: megachips: remove bridge when irq request fails

2026-06-01T15:39:37+00:00

commit d45d5c819f2cd0b6b5d76a194a537a5f4aeefecb upstream. If devm_request_threaded_irq() fails after drm_bridge_add(), remove the bridge before returning. Keep drm_bridge_add() rather than devm_drm_bridge_add(): registration is tied to the STDP4028 device while ge_b850v3_register() may complete from either I2C probe; devm would not unwind the bridge if the other client's probe fails. Signed-off-by: Osama Abdelkader Fixes: fcfa0ddc18ed ("drm/bridge: Drivers for megachips-stdpxxxx-ge-b850v3-fw (LVDS-DP++)") Cc: stable@vger.kernel.org Reviewed-by: Luca Ceresoli Tested-by: Ian Ray Link: https://patch.msgid.link/20260430195700.80317-1-osama.abdelkader@gmail.com Signed-off-by: Luca Ceresoli Signed-off-by: Greg Kroah-Hartman

drm/bridge: it66121: acquire reset GPIO in probe

2026-06-01T15:39:36+00:00

commit e02b5262fd288cc235f14e12233ea54e78c04611 upstream. The it66121_ctx structure has a gpio_reset field, and it66121_hw_reset() calls gpiod_set_value() on it. However, the GPIO descriptor is never acquired via devm_gpiod_get(), leaving gpio_reset as NULL throughout the driver lifetime. gpiod_set_value() silently returns when passed a NULL descriptor, so the hardware reset sequence in it66121_hw_reset() is a no-op. This leaves the chip in an undefined state at probe time, which can prevent it from responding on the I2C bus. The DT binding marks reset-gpios as a required property, so all compliant device trees provide this GPIO. Add the missing devm_gpiod_get() call after enabling power supplies and before the hardware reset, so the chip is properly reset with power applied. Fixes: 988156dc2fc9 ("drm: bridge: add it66121 driver") Cc: stable@vger.kernel.org Signed-off-by: Julien Chauveau Reviewed-by: Javier Martinez Canillas Tested-by: Javier Martinez Canillas Link: https://patch.msgid.link/20260324193011.16583-1-chauveau.julien@gmail.com Signed-off-by: Javier Martinez Canillas Signed-off-by: Greg Kroah-Hartman

drm/bridge: chipone-icn6211: use devm_drm_bridge_add in i2c probe

2026-06-01T15:39:36+00:00

commit 73d01051e8040c0b1de7fd26b3b8d0c2ffa6895c upstream. Use devm_drm_bridge_add() so the bridge is released if probe fails after registration, and drop drm_bridge_remove() in chipone_i2c_probe. Signed-off-by: Osama Abdelkader Fixes: 8dde6f7452a1 ("drm: bridge: icn6211: Add I2C configuration support") Cc: stable@vger.kernel.org Reviewed-by: Luca Ceresoli Link: https://patch.msgid.link/20260430194944.78119-1-osama.abdelkader@gmail.com Signed-off-by: Luca Ceresoli Signed-off-by: Greg Kroah-Hartman

drm/bridge: ti-sn65dsi83: halve horizontal syncs for dual LVDS output

2026-03-25T10:03:16+00:00

[ Upstream commit d0d727746944096a6681dc6adb5f123fc5aa018d ] Dual LVDS output (available on the SN65DSI84) requires HSYNC_PULSE_WIDTH and HORIZONTAL_BACK_PORCH to be divided by two with respect to the values used for single LVDS output. While not clearly stated in the datasheet, this is needed according to the DSI Tuner [0] output. It also makes sense intuitively because in dual LVDS output two pixels at a time are output and so the output clock is half of the pixel clock. Some dual-LVDS panels refuse to show any picture without this fix. Divide by two HORIZONTAL_FRONT_PORCH too, even though this register is used only for test pattern generation which is not currently implemented by this driver. [0] https://www.ti.com/tool/DSI-TUNER Fixes: ceb515ba29ba ("drm/bridge: ti-sn65dsi83: Add TI SN65DSI83 and SN65DSI84 driver") Cc: stable@vger.kernel.org Reviewed-by: Marek Vasut Link: https://patch.msgid.link/20260226-ti-sn65dsi83-dual-lvds-fixes-and-test-pattern-v1-2-2e15f5a9a6a0@bootlin.com Signed-off-by: Luca Ceresoli [ adapted variable declaration placement ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

drm/bridge: ti-sn65dsi86: Add support for DisplayPort mode with HPD

2026-03-25T10:03:11+00:00

commit 9133bc3f0564890218cbba6cc7e81ebc0841a6f1 upstream. Add support for DisplayPort to the bridge, which entails the following: - Get and use an interrupt for HPD; - Properly clear all status bits in the interrupt handler; Signed-off-by: John Ripple Reviewed-by: Douglas Anderson Signed-off-by: Douglas Anderson Link: https://lore.kernel.org/r/20250915174543.2564994-1-john.ripple@keysight.com Signed-off-by: Greg Kroah-Hartman

drm/bridge: ti-sn65dsi83: fix CHA_DSI_CLK_RANGE rounding

2026-03-25T10:03:09+00:00

commit 2f22702dc0fee06a240404e0f7ead5b789b253d8 upstream. The DSI frequency must be in the range: (CHA_DSI_CLK_RANGE * 5 MHz) <= DSI freq < ((CHA_DSI_CLK_RANGE + 1) * 5 MHz) So the register value should point to the lower range value, but DIV_ROUND_UP() rounds the division to the higher range value, resulting in an excess of 1 (unless the frequency is an exact multiple of 5 MHz). For example for a 437100000 MHz clock CHA_DSI_CLK_RANGE should be 87 (0x57): (87 * 5 = 435) <= 437.1 < (88 * 5 = 440) but current code returns 88 (0x58). Fix the computation by removing the DIV_ROUND_UP(). Fixes: ceb515ba29ba ("drm/bridge: ti-sn65dsi83: Add TI SN65DSI83 and SN65DSI84 driver") Cc: stable@vger.kernel.org Reviewed-by: Marek Vasut Link: https://patch.msgid.link/20260226-ti-sn65dsi83-dual-lvds-fixes-and-test-pattern-v1-1-2e15f5a9a6a0@bootlin.com Signed-off-by: Luca Ceresoli Signed-off-by: Greg Kroah-Hartman

drm/bridge: ti-sn65dsi86: Enable HPD polling if IRQ is not used

2026-03-25T10:03:08+00:00

commit 0b87d51690dd5131cbe9fbd23746b037aab89815 upstream. Fallback to polling to detect hotplug events on systems without interrupts. On systems where the interrupt line of the bridge is not connected, the bridge cannot notify hotplug events. Only add the DRM_BRIDGE_OP_HPD flag if an interrupt has been registered otherwise remain in polling mode. Fixes: 55e8ff842051 ("drm/bridge: ti-sn65dsi86: Add HPD for DisplayPort connector type") Cc: stable@vger.kernel.org # 6.16: 9133bc3f0564: drm/bridge: ti-sn65dsi86: Add Signed-off-by: Franz Schnyder Reviewed-by: Douglas Anderson [dianders: Adjusted Fixes/stable line based on discussion] Signed-off-by: Douglas Anderson Link: https://patch.msgid.link/20260206123758.374555-1-fra.schnyder@gmail.com Signed-off-by: Greg Kroah-Hartman

drm/bridge: display-connector: don't set OP_DETECT for DisplayPorts

2025-12-06T21:12:19+00:00

[ Upstream commit cb640b2ca54617f4a9d4d6efd5ff2afd6be11f19 ] Detecting the monitor for DisplayPort targets is more complicated than just reading the HPD pin level: it requires reading the DPCD in order to check what kind of device is attached to the port and whether there is an actual display attached. In order to let DRM framework handle such configurations, disable DRM_BRIDGE_OP_DETECT for dp-connector devices, letting the actual DP driver perform detection. This still keeps DRM_BRIDGE_OP_HPD enabled, so it is valid for the bridge to report HPD events. Currently inside the kernel there are only two targets which list hpd-gpios for dp-connector devices: arm64/qcom/qcs6490-rb3gen2 and arm64/qcom/sa8295p-adp. Both should be fine with this change. Cc: Bjorn Andersson Cc: Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org Acked-by: Laurent Pinchart Link: https://lore.kernel.org/r/20250802-dp-conn-no-detect-v1-1-2748c2b946da@oss.qualcomm.com Signed-off-by: Dmitry Baryshkov Signed-off-by: Sasha Levin

drm/bridge: lt9211: Drop check for last nibble of version register

2025-10-29T13:04:34+00:00

[ Upstream commit db74b04edce1bc86b9a5acc724c7ca06f427ab60 ] There is now a new LT9211 rev. U5, which reports chip ID 0x18 0x01 0xe4 . The previous LT9211 reported chip ID 0x18 0x01 0xe3 , which is what the driver checks for right now. Since there is a possibility there will be yet another revision of the LT9211 in the future, drop the last version nibble check to allow all future revisions of the chip to work with this driver. This fix makes LT9211 rev. U5 work with this driver. Fixes: 8ce4129e3de4 ("drm/bridge: lt9211: Add Lontium LT9211 bridge driver") Signed-off-by: Marek Vasut Reviewed-by: Dmitry Baryshkov Link: https://lore.kernel.org/r/20251011110017.12521-1-marek.vasut@mailbox.org Signed-off-by: Dmitry Baryshkov Signed-off-by: Sasha Levin

drm: bridge: cdns-mhdp8546: Fix missing mutex unlock on error path

2025-09-25T08:58:54+00:00

[ Upstream commit 288dac9fb6084330d968459c750c838fd06e10e6 ] Add missing mutex unlock before returning from the error path in cdns_mhdp_atomic_enable(). Fixes: 935a92a1c400 ("drm: bridge: cdns-mhdp8546: Fix possible null pointer dereference") Reported-by: Hulk Robot Signed-off-by: Qi Xi Reviewed-by: Luca Ceresoli Reviewed-by: Dmitry Baryshkov Link: https://lore.kernel.org/r/20250904034447.665427-1-xiqi2@huawei.com Signed-off-by: Luca Ceresoli Signed-off-by: Sasha Levin