From: sashiko-bot@kernel.org
To: "Mohamad Raizudeen" <raizudeen.kerneldev@gmail.com>
Cc: linux-pci@vger.kernel.org
Subject: Re: [PATCH] PCI: Fix 32-bit config write in Intel RP MPC ACS quirk
Date: Thu, 23 Jul 2026 06:46:36 +0000 [thread overview]
Message-ID: <20260723064638.57CCE1F000E9@smtp.kernel.org> (raw)
In-Reply-To: <20260723064300.8081-1-raizudeen.kerneldev@gmail.com>
> The pci_quirk_enable_intel_rp_mpc_acs() reads a 32 bit DWORD from the
> MPC register, sets bit 26 (INTEL_MPC_REG_IRBNCE), but it writes it back
> using pci_write_config_word().
>
> Because bit 26 resides in the upper 16 bits of the 32 bit register, a 16
> bit write to offset 0xd8 completely drops the newly set bit. The quirk
> logs that it is enabling IRBNCE, but the hardware never actually
> receives the command.
>
> Fix this by using pci_write_config_dword() to ensure the full 32 bit
> value is written back to the hardware.
>
> Signed-off-by: Mohamad Raizudeen <raizudeen.kerneldev@gmail.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260723064300.8081-1-raizudeen.kerneldev@gmail.com?part=1
next prev parent reply other threads:[~2026-07-23 6:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-23 6:43 [PATCH] PCI: Fix 32-bit config write in Intel RP MPC ACS quirk Mohamad Raizudeen
2026-07-23 6:46 ` sashiko-bot [this message]
2026-07-23 16:06 ` Bjorn Helgaas
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260723064638.57CCE1F000E9@smtp.kernel.org \
--to=sashiko-bot@kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=raizudeen.kerneldev@gmail.com \
--cc=sashiko-reviews@lists.linux.dev \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.