From: H. Nikolaus Schaller hns@goldelico.com
[ Upstream commit a622310f7f0185da02e42cdb06475f533efaae60 ]
OMAP processors support 32 channels but there is no check or inspect this except booting a device and looking at dmesg reports of not available channels.
Recently some more subsystems with DMA (aes1+2) were added filling the list of dma channels beyond the limit of 32 (even if other parameters indicate 96 or 128 channels). This leads to random subsystem failures i(e.g. mcbsp for audio) after boot or boot messages that DMA can not be initialized.
Another symptom is that
/sys/kernel/debug/dmaengine/summary
has 32 entries and does not show all required channels.
Fix by disabling unused (on the GTA04 hardware) mcspi1...4. Each SPI channel allocates 4 DMA channels rapidly filling the available ones.
Disabling unused SPI modules on the OMAP3 SoC may also save some energy (has not been checked).
Fixes: c312f066314e ("ARM: dts: omap3: Migrate AES from hwmods to sysc-omap2") Signed-off-by: H. Nikolaus Schaller hns@goldelico.com [re-enabled aes2, improved commit subject line] Signed-off-by: Andreas Kemnade andreas@kemnade.info Message-Id: 20230113211151.2314874-1-andreas@kemnade.info Signed-off-by: Tony Lindgren tony@atomide.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm/boot/dts/omap3-gta04.dtsi | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/arch/arm/boot/dts/omap3-gta04.dtsi b/arch/arm/boot/dts/omap3-gta04.dtsi index 28a6a9345be52..2dbee248a126f 100644 --- a/arch/arm/boot/dts/omap3-gta04.dtsi +++ b/arch/arm/boot/dts/omap3-gta04.dtsi @@ -612,6 +612,22 @@ clock-frequency = <100000>; };
+&mcspi1 { + status = "disabled"; +}; + +&mcspi2 { + status = "disabled"; +}; + +&mcspi3 { + status = "disabled"; +}; + +&mcspi4 { + status = "disabled"; +}; + &usb_otg_hs { interface-type = <0>; usb-phy = <&usb2_phy>;