Re: [PATCH] ALSA: hda: Force MSI for Hygon H34M51A board

[Takashi Iwai <tiwai@suse.de>]

On Thu, 22 Oct 2026 10:54:38 +0200,
rppxj178543@163.com wrote:
> 
> From: renpanpan <renpanpan@kylinos.cn>
> 
> The Hygon HDA controller (PCI 1d94:14a9) has AZX_DCAPS_NO_MSI set in
> the PCI ID table to use legacy INTx, as MSI may lose interrupts under
> heavy load on some Hygon platforms (commit 41212ff3e4ed ("ALSA: hda:
> Add support for Hygon family 18h model 5h HD-Audio")).
> 
> However, on the Kunlun H34M51A board (PCI subsystem 1d94:c950) the
> INTx interrupt line is not wired.  /proc/interrupts shows zero count
> for the HDA IRQ from boot, so the RIRB interrupt handler is never
> called.  Without RIRB processing, azx_rirb_get_response() times out
> after 1 s, switches to polling mode, and the resulting slow codec
> communication delays card registration by ~20 s and breaks
> unsolicited jack-detection event delivery.
> 
> Force MSI on for subsystem 1d94:c950 by adding it to msi_deny_list
> with value 1.  The list is consulted in check_msi() before the
> AZX_DCAPS_NO_MSI check, so H34M51A gets MSI enabled while other
> Hygon platforms retain INTx.
> 
> Signed-off-by: renpanpan <renpanpan@kylinos.cn>

Applied now.  Thanks.


Takashi