Dss ds docs by akashdeep-ti · Pull Request #732 · TexasInstruments/processor-sdk-doc

akashdeep-ti · 2026-07-03T08:46:48Z

No description provided.

github-actions · 2026-07-03T08:47:43Z

New warnings found with rstcheck:

source/linux/Foundational_Components/Power_Management/pm_am62lx_low_power_modes.rst:177: (WARNING/2) Title underline too short.
source/linux/Foundational_Components/Power_Management/pm_am62lx_low_power_modes.rst:223: (WARNING/2) Title underline too short.
source/linux/Foundational_Components/Power_Management/pm_am62lx_low_power_modes.rst:311: (WARNING/2) Title underline too short.
source/linux/Foundational_Components/Power_Management/pm_am62lx_low_power_modes.rst:335: (ERROR/3) Malformed table.

Add DSS plus Deep Sleep low power mode, a new suspend mode where the Display Subsystem remains powered to show a static image while the rest of the system enters Deep Sleep. Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>

Add power consumption data for DSS plus Deep Sleep mode. This mode consumes more power than standard Deep Sleep (14.07 mW) due to the active display subsystem with FIFO replay. Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>

Add DSS plus Deep Sleep mode to Key Release References section, highlighting the new display subsystem self-refresh capability that allows showing static images during system suspend. Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>

StaticRocket

Vale comments about passive voice and such

StaticRocket · 2026-07-10T00:08:12Z

+DSS plus Deep Sleep
+*******************
+
+DSS plus Deep Sleep is a low-power mode where the Display Subsystem (DSS) is kept on to display


Suggested change

DSS plus Deep Sleep is a low-power mode where the Display Subsystem (DSS) is kept on to display

DSS plus Deep Sleep is a low-power mode where the Display Subsystem (DSS) is on to display

StaticRocket · 2026-07-10T00:08:43Z

+
+DSS plus Deep Sleep is a low-power mode where the Display Subsystem (DSS) is kept on to display
+a static image while the rest of the system enters Deep Sleep. This mode is useful for
+applications that need to maintain visual output during system suspend, such as displaying


Suggested change

applications that need to maintain visual output during system suspend, such as displaying

applications that need to keep visual output during system suspend, such as displaying

StaticRocket · 2026-07-10T00:09:36Z

+applications that need to maintain visual output during system suspend, such as displaying
+status information, warnings, or other static content while minimizing overall power consumption.
+
+In DSS plus Deep Sleep mode, the system state is retained in RAM with DDR in self-refresh,


Suggested change

In DSS plus Deep Sleep mode, the system state is retained in RAM with DDR in self-refresh,

In DSS plus Deep Sleep mode, the system state stays in RAM with DDR in self-refresh,

StaticRocket · 2026-07-10T00:10:21Z

+How It Works
+============
+
+DSS plus Deep Sleep requires two display properties to be enabled together:


Suggested change

DSS plus Deep Sleep requires two display properties to be enabled together:

DSS plus Deep Sleep requires two display properties:

StaticRocket · 2026-07-10T00:11:10Z

+significantly reduces memory bandwidth and power consumption during suspend.
+
+The AM62L-DSS has a 20 KB FIFO buffer. For the self-refresh feature to work, your static
+image must fit within this buffer. The size is calculated as:


Suggested change

image must fit within this buffer. The size is calculated as:

image must fit within this buffer. The size is:

StaticRocket · 2026-07-10T00:15:09Z

+it ensures the static frame remains visible throughout the suspend period.
+
+Using both properties together enables DSS plus Deep Sleep mode: the display stays on showing
+a static frame from internal memory while the rest of the system is suspended.


Suggested change

a static frame from internal memory while the rest of the system is suspended.

a static frame from internal memory while the rest of the system suspends.

StaticRocket · 2026-07-10T00:15:59Z

+=================================
+
+Entering DSS plus Deep Sleep requires several steps to configure the display subsystem properly.
+First, stop any display manager service that may be actively managing the display:


Suggested change

First, stop any display manager service that may be actively managing the display:

First, stop any display manager service that might be actively managing the display:

StaticRocket · 2026-07-10T00:17:19Z

+
+   root@am62lxx-evm:~# echo s2idle > /sys/power/mem_sleep
+
+Now the SoC can be suspended using the following command:


Suggested change

Now the SoC can be suspended using the following command:

The SoC can now suspend using the following command:

StaticRocket · 2026-07-10T00:19:17Z

+=================================
+
+After the system resumes from DSS plus Deep Sleep, the static frame continues to be displayed
+from the FIFO. The display does **not** automatically transition back to dynamic content.


Suggested change

from the FIFO. The display does **not** automatically transition back to dynamic content.

from the FIFO. The display does **not** automatically change back to dynamic content.

StaticRocket · 2026-07-10T00:20:23Z

+   root@am62lxx-evm:~# modetest -M tidss -w 35:SELF_REFRESH:0  # Disable FIFO replay
+   root@am62lxx-evm:~# modetest -M tidss -w 42:ALWAYS_ON_DISPLAY:0  # Allow display pipeline to be powered off
+
+Once these properties are disabled, the display subsystem returns to fetching framebuffers


Suggested change

Once these properties are disabled, the display subsystem returns to fetching framebuffers

Once disabled, the display subsystem returns to fetching framebuffers

akashdeep-ti requested review from StaticRocket, VeeruPrudhvi, cshilwant, gehariprasath, jeevantelukula, praneethbajjuri and uditkumarti as code owners July 3, 2026 08:46

github-actions Bot assigned bryanbrattlof, devarsht, gehariprasath, praneethbajjuri, r-vignesh, sskartheekadivi, uditkumarti and vishalmti Jul 3, 2026

akashdeep-ti added 3 commits July 3, 2026 15:30

feat(pm_low_power_modes): add DSS plus Deep Sleep mode for AM62LX

d91a376

Add DSS plus Deep Sleep low power mode, a new suspend mode where the Display Subsystem remains powered to show a static image while the rest of the system enters Deep Sleep. Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>

feat(linux): add DSS plus Deep Sleep power measurements

9d9ef33

Add power consumption data for DSS plus Deep Sleep mode. This mode consumes more power than standard Deep Sleep (14.07 mW) due to the active display subsystem with FIFO replay. Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>

akashdeep-ti force-pushed the dss_ds_docs branch from 317a2f5 to f7d3760 Compare July 3, 2026 10:01

StaticRocket requested changes Jul 10, 2026

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Dss ds docs#732

Dss ds docs#732
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	DSS plus Deep Sleep is a low-power mode where the Display Subsystem (DSS) is kept on to display
	DSS plus Deep Sleep is a low-power mode where the Display Subsystem (DSS) is on to display

	applications that need to maintain visual output during system suspend, such as displaying
	applications that need to keep visual output during system suspend, such as displaying

	In DSS plus Deep Sleep mode, the system state is retained in RAM with DDR in self-refresh,
	In DSS plus Deep Sleep mode, the system state stays in RAM with DDR in self-refresh,

	DSS plus Deep Sleep requires two display properties to be enabled together:
	DSS plus Deep Sleep requires two display properties:

	image must fit within this buffer. The size is calculated as:
	image must fit within this buffer. The size is:

	a static frame from internal memory while the rest of the system is suspended.
	a static frame from internal memory while the rest of the system suspends.

	First, stop any display manager service that may be actively managing the display:
	First, stop any display manager service that might be actively managing the display:


		root@am62lxx-evm:~# echo s2idle > /sys/power/mem_sleep

		Now the SoC can be suspended using the following command:

	Now the SoC can be suspended using the following command:
	The SoC can now suspend using the following command:

	from the FIFO. The display does not automatically transition back to dynamic content.
	from the FIFO. The display does not automatically change back to dynamic content.

	Once these properties are disabled, the display subsystem returns to fetching framebuffers
	Once disabled, the display subsystem returns to fetching framebuffers

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