linux-kernel - Re: [PATCH 05/11] clk: sunxi-ng: sun55i-a523-r-ccu: Mark bus-r-dma as critical

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3374980.aeNJFYEL58@jernej-laptop>
Date: Mon, 20 Oct 2025 19:51:00 +0200
From: Jernej Škrabec <jernej.skrabec@...il.com>
To: Chen-Yu Tsai <wens@...nel.org>, Jernej Skrabec <jernej@...nel.org>,
 Samuel Holland <samuel@...lland.org>, Mark Brown <broonie@...nel.org>,
 Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Vinod Koul <vkoul@...nel.org>, Chen-Yu Tsai <wens@...nel.org>
Cc: linux-sunxi@...ts.linux.dev, linux-sound@...r.kernel.org,
 linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 devicetree@...r.kernel.org, dmaengine@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject:
 Re: [PATCH 05/11] clk: sunxi-ng: sun55i-a523-r-ccu: Mark bus-r-dma as
 critical

Dne ponedeljek, 20. oktober 2025 ob 19:10:51 Srednjeevropski poletni čas je Chen-Yu Tsai napisal(a):
> The "bus-r-dma" clock in the A523's PRCM clock controller is also
> referred to as "DMA_CLKEN_SW" or "DMA ADB400 gating". It is unclear how
> this ties into the DMA controller MBUS clock gate; however if the clock
> is not enabled, the DMA controller in the MCU block will fail to access
> DRAM, even failing to retrieve the DMA descriptors.
> 
> Mark this clock as critical. This sort of mirrors what is done for the
> main DMA controller's MBUS clock, which has a separate toggle that is
> currently left out of the main clock controller driver.
> 
> Fixes: 8cea339cfb81 ("clk: sunxi-ng: add support for the A523/T527 PRCM CCU")
> Signed-off-by: Chen-Yu Tsai <wens@...nel.org>

Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

> ---
>  drivers/clk/sunxi-ng/ccu-sun55i-a523-r.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu-sun55i-a523-r.c b/drivers/clk/sunxi-ng/ccu-sun55i-a523-r.c
> index 70ce0ca0cb7d..fdcdcccd0939 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun55i-a523-r.c
> +++ b/drivers/clk/sunxi-ng/ccu-sun55i-a523-r.c
> @@ -121,7 +121,7 @@ static SUNXI_CCU_GATE_HW(bus_r_ir_rx_clk, "bus-r-ir-rx",
>  			 &r_apb0_clk.common.hw, 0x1cc, BIT(0), 0);
>  
>  static SUNXI_CCU_GATE_HW(bus_r_dma_clk, "bus-r-dma",
> -			 &r_apb0_clk.common.hw, 0x1dc, BIT(0), 0);
> +			 &r_apb0_clk.common.hw, 0x1dc, BIT(0), CLK_IS_CRITICAL);
>  static SUNXI_CCU_GATE_HW(bus_r_rtc_clk, "bus-r-rtc",
>  			 &r_apb0_clk.common.hw, 0x20c, BIT(0), 0);
>  static SUNXI_CCU_GATE_HW(bus_r_cpucfg_clk, "bus-r-cpucfg",
>