[PATCH 0/7] Add DSI display support for TI's Jacinto platforms

[Jayesh Choudhary]

Hello Udit,

On 19/04/25 14:23, Kumar, Udit wrote:
> 
> On 4/11/2025 4:21 PM, Jayesh Choudhary wrote:
>> Hello All,
>>
>> This series adds the dts support to enable DSI on 3 platforms for TI 
>> SoCs:
>> - J784S4-EVM
>> - J721S2-EVM
>> - AM68-SK
>>
>> [..]
>>
>> NOTE: For higher resolutions, we need bigger CMA region.
>> But for validation, the default value is enough.
> 
> I am not sure , how DSS uses CMA region
> 

The framebuffers for dss are allocated from cma-pool.
By default the cma-region is of 32MiB that is shared by various peripherals.

1920x1080 requires ~16MiB of CMA but sometimes due to fragmentation,
we cannot get even this much for framebuffer and memory is not allocated 
resulting in display failures.

And large resolutions like 4k at 60fps require ~64MiB straight away.
So it is better to reserve appropriate CMA region.

Thanks
Jayesh

> 
>> I am posting another series to add CMA region to Jacinto platforms
>> similar to Sitara family soon:
>> <https://lore.kernel.org/all/20240613150902.2173582-1-devarsht@ti.com/>
>>
>> Jayesh Choudhary (5):
>>    arm64: dts: ti: k3-j784s4-j742s2-main-common: add DSI & DSI PHY
>>    arm64: dts: ti: k3-j784s4-j742s2-evm-common: Enable DisplayPort-1
>>    arm64: dts: ti: k3-j721s2-common-proc-board: Add main_i2c4 instance
>>    arm64: dts: ti: k3-j721s2-common-proc-board: Enable DisplayPort-1
>>    arm64: dts: ti: k3-am68-sk: Enable DSI on DisplayPort-0
>>
>> Rahul T R (2):
>>    arm64: dts: ti: k3-j721s2-main: add DSI & DSI PHY
>>    arm64: dts: ti: k3-j721s2-som-p0: add DSI to eDP
>>
>>   .../boot/dts/ti/k3-am68-sk-base-board.dts     |  96 ++++++++++++++
>>   .../dts/ti/k3-j721s2-common-proc-board.dts    | 116 +++++++++++++++++
>>   arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi    |  37 ++++++
>>   arch/arm64/boot/dts/ti/k3-j721s2-som-p0.dtsi  |  52 ++++++++
>>   .../dts/ti/k3-j784s4-j742s2-evm-common.dtsi   | 117 +++++++++++++++++-
>>   .../dts/ti/k3-j784s4-j742s2-main-common.dtsi  |  37 ++++++
>>   6 files changed, 454 insertions(+), 1 deletion(-)
>>