kernel/linux.git/drivers/interconnect/mediatek, branch v7.0-rc7

interconnect: mediatek: Aggregate bandwidth with saturating add

2025-12-21T11:59:54+00:00

By using a regular non-overflow-checking add, the MediaTek icc-emi driver will happy wrap at U32_MAX + 1 to 0. As it's common for the interconnect core to fill in INT_MAX values, this is not a hypothetical situation, but something that actually happens in regular use. This would be pretty disasterous if anything used this driver. Replace the addition with an overflow-checked addition from overflow.h, and saturate to U32_MAX if an overflow is detected. Fixes: b45293799f75 ("interconnect: mediatek: Add MediaTek MT8183/8195 EMI Interconnect driver") Reviewed-by: AngeloGioacchino Del Regno Signed-off-by: Nicolas Frattaroli Link: https://lore.kernel.org/r/20251124-mt8196-dvfsrc-v2-13-d9c1334db9f3@collabora.com Signed-off-by: Georgi Djakov

interconnect: mediatek: Don't hijack parent device

2025-12-21T11:59:47+00:00

If the intention is that users of the interconnect declare their relationship to the child icc_emi node of the dvfsrc controller, then this code never worked. That's because it uses the parent dvfsrc device as the device it passes to the interconnect core framework, which means all the OF parsing is broken. Use the actual device instead, and pass the dvfsrc parent into the dvfsrc calls. Fixes: b45293799f75 ("interconnect: mediatek: Add MediaTek MT8183/8195 EMI Interconnect driver") Reviewed-by: AngeloGioacchino Del Regno Signed-off-by: Nicolas Frattaroli Link: https://lore.kernel.org/r/20251124-mt8196-dvfsrc-v2-12-d9c1334db9f3@collabora.com Signed-off-by: Georgi Djakov

interconnect: mediatek: Add support for MediaTek MT8196 EMI ICC

2025-12-21T11:59:38+00:00

Add a new driver with data to register the External Memory Interface (EMI) Interconnect on the MediaTek MT8196 Chromebook SoC. Signed-off-by: AngeloGioacchino Del Regno Signed-off-by: Nicolas Frattaroli Link: https://lore.kernel.org/r/20251124-mt8196-dvfsrc-v2-11-d9c1334db9f3@collabora.com Signed-off-by: Georgi Djakov

interconnect: Switch back to struct platform_driver::remove()

2024-10-22T09:34:18+00:00

After commit 0edb555a65d1 ("platform: Make platform_driver::remove() return void") .remove() is (again) the right callback to implement for platform drivers. Convert all platform drivers below drivers/interconnect to use .remove(), with the eventual goal to drop struct platform_driver::remove_new(). As .remove() and .remove_new() have the same prototypes, conversion is done by just changing the structure member name in the driver initializer. Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20241017154920.136220-2-u.kleine-koenig@baylibre.com Signed-off-by: Georgi Djakov

interconnect: mediatek: remove unneeded semicolon

2024-06-24T12:07:25+00:00

No functional modification involved. ./drivers/interconnect/mediatek/icc-emi.c:71:2-3: Unneeded semicolon. Reported-by: Abaci Robot Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=9401 Signed-off-by: Jiapeng Chong Link: https://lore.kernel.org/r/20240624025326.69551-1-jiapeng.chong@linux.alibaba.com Signed-off-by: Georgi Djakov

interconnect: mediatek: Add MediaTek MT8183/8195 EMI Interconnect driver

2024-06-13T11:31:43+00:00

Add an interconnect driver for the External Memory Interface (EMI), voting for bus bandwidth over the Dynamic Voltage and Frequency Scaling Resource Collector (DVFSRC). ICC provider ICC Nodes ---- ---- --------- |CPU | |--- |VPU | ----- | |----- ---- | ---- |DRAM |--|DRAM | ---- | ---- | |--|scheduler|----- |GPU | |--- |DISP| | |--|(EMI) | ---- | ---- | |--| | ----- | ---- ----- | |----- |MMSYS|--|--- |VDEC| --------- ----- | ---- /|\ | ---- |change DRAM freq |--- |VENC| ---------- | ---- | DVFSR | | | | | ---- ---------- |--- |IMG | | ---- | ---- |--- |CAM | ---- Signed-off-by: AngeloGioacchino Del Regno Link: https://lore.kernel.org/r/20240610085735.147134-8-angelogioacchino.delregno@collabora.com Signed-off-by: Georgi Djakov