[PATCH 1/2] clk: renesas: Do not enable MSTP4 modules on R8A77995 D3

[Marek Vasut]

On 12/28/25 2:03 AM, Niklas Söderlund wrote:
> Since commit a2bd99549c61 ("clk: renesas: Tear clock controller down
> last before booting OS") enabling the module gated by bit 8 in MSTP4
> prevents Linux from booting. Furthermore bits 8 and 7 of MSTP4 where
> only documented in early versions of the datasheet and have since been
> removed, do the same in the driver to allow Linux to boot.
> 
> Suggested-by: Marek Vasut <marek.vasut+renesas at mailbox.org>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas at ragnatech.se>
> ---
>   drivers/clk/renesas/r8a77995-cpg-mssr.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/renesas/r8a77995-cpg-mssr.c b/drivers/clk/renesas/r8a77995-cpg-mssr.c
> index f49faa47cb37..0a59a19cb227 100644
> --- a/drivers/clk/renesas/r8a77995-cpg-mssr.c
> +++ b/drivers/clk/renesas/r8a77995-cpg-mssr.c
> @@ -220,7 +220,7 @@ static const struct mstp_stop_table r8a77995_mstp_table[] = {
>   	{ 0x03e01000, 0x0, 0x03e01000, 0 },
>   	{ 0x000e2fdc, 0x2000, 0x000e2fd8, 0 },
>   	{ 0xc00014df, 0x400, 0xc00014df, 0 },
> -	{ 0x80000004, 0x180, 0x80000004, 0 },
> +	{ 0x80000004, 0x0, 0x80000004, 0 },
Should we disable both BIT(8) and BIT(7), or only the BIT(8) that hangs 
the system ?