[PATCH] ASoC: AMD Renoir - add DMI table to avoid the ACP mic probe (broken BIOS)

[Takashi Iwai]

On Tue, 08 Dec 2020 16:36:54 +0100,
Jaroslav Kysela wrote:
> 
> Users reported that some Lenovo AMD platforms do not have ACP microphone,
> but the BIOS advertises it via ACPI.
> 
> This patch create a simple DMI table, where those machines with the broken
> BIOS can be added. The DMI description for Lenovo IdeaPad 5 and
> IdeaPad Flex 5 devices are added there.
> 
> Also describe the dmic_acpi_check kernel module parameter in a more
> understandable way.
> 
> BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1892115
> Cc: <stable at kernel.org>
> Cc: Vijendar Mukunda <Vijendar.Mukunda at amd.com>
> Cc: Mark Brown <broonie at kernel.org>
> Signed-off-by: Jaroslav Kysela <perex at perex.cz>
> ---
>  sound/soc/amd/renoir/rn-pci-acp3x.c | 28 +++++++++++++++++++++++-----
>  1 file changed, 23 insertions(+), 5 deletions(-)
> 
> diff --git a/sound/soc/amd/renoir/rn-pci-acp3x.c b/sound/soc/amd/renoir/rn-pci-acp3x.c
> index b943e59fc302..3289ab3eae6f 100644
> --- a/sound/soc/amd/renoir/rn-pci-acp3x.c
> +++ b/sound/soc/amd/renoir/rn-pci-acp3x.c
> @@ -6,6 +6,7 @@
>  
>  #include <linux/pci.h>
>  #include <linux/acpi.h>
> +#include <linux/dmi.h>
>  #include <linux/module.h>
>  #include <linux/io.h>
>  #include <linux/delay.h>
> @@ -20,14 +21,13 @@ module_param(acp_power_gating, int, 0644);
>  MODULE_PARM_DESC(acp_power_gating, "Enable acp power gating");
>  
>  /**
> - * dmic_acpi_check = -1 - Checks ACPI method to know DMIC hardware status runtime
> - *                 = 0 - Skips the DMIC device creation and returns probe failure
> - *                 = 1 - Assumes that platform has DMIC support and skips ACPI
> - *                       method check
> + * dmic_acpi_check = -1 - Use ACPI/DMI method to detect the DMIC hardware presence at runtime
> + *                 =  0 - Skip the DMIC device creation and return probe failure
> + *                 =  1 - Force DMIC support
>   */
>  static int dmic_acpi_check = ACP_DMIC_AUTO;
>  module_param(dmic_acpi_check, bint, 0644);
> -MODULE_PARM_DESC(dmic_acpi_check, "checks Dmic hardware runtime");
> +MODULE_PARM_DESC(dmic_acpi_check, "Digital microphone presence (-1=auto, 0=none, 1=force)");
>  
>  struct acp_dev_data {
>  	void __iomem *acp_base;
> @@ -163,6 +163,17 @@ static int rn_acp_deinit(void __iomem *acp_base)
>  	return 0;
>  }
>  
> +static const struct dmi_system_id rn_acp_quirk_table[] = {
> +	{
> +		/* Lenovo IdeaPad Flex 5 14ARE05, IdeaPad 5 15ARE05 */
> +		.matches = {
> +			DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
> +			DMI_EXACT_MATCH(DMI_BOARD_NAME, "LNVNB161216"),
> +		}
> +	},
> +	{}
> +};
> +
>  static int snd_rn_acp_probe(struct pci_dev *pci,
>  			    const struct pci_device_id *pci_id)
>  {
> @@ -172,6 +183,7 @@ static int snd_rn_acp_probe(struct pci_dev *pci,
>  	acpi_handle handle;
>  	acpi_integer dmic_status;
>  #endif
> +	const struct dmi_system_id *dmi_id;
>  	unsigned int irqflags;
>  	int ret, index;
>  	u32 addr;
> @@ -232,6 +244,12 @@ static int snd_rn_acp_probe(struct pci_dev *pci,
>  			goto de_init;
>  		}
>  #endif
> +		dmi_id = dmi_first_match(rn_acp_quirk_table);
> +		if (dmi_id && !dmi_id->driver_data) {
> +			dev_warn(&pci->dev, "ACPI settings override using DMI (ACP mic is not present)");

IMO, better to be dev_info() here.  It's the correct set up, hence
it should be neither error nor warning that appears in the boot screen
over the boot splash.

BTW, both Raven and Reonir drivers point to the very same PCI ID,
and both drivers will be probed for this machine (and both to be
skipped).

Also, I noticed that Renoir driver tries to detect the dmic at the
late stage; this could be done at the very beginning, so the whole
allocation and initialization could be simply skipped.  But this can
be done in a separate cleanup patch.


thanks,

Takashi