On Fri, 21 Apr 2017 22:45:29 +0200, Pierre-Louis Bossart wrote:
On 04/21/2017 03:38 PM, Takashi Iwai wrote:
The bytcr-rt5640 driver has a few quirk setups depending on the board, where the quirk value is set by DMI matching. When you have a new device to add the support, you often experience to try the different quirk by trial-and-error. Or, you may have a development model that still has no proper DMI string. In either case, you'd need to compile the driver at each time.
This patch introduces a module option to override the quirk value on the fly. User can boot like snd-soc-sst-bytcr-rt5640.quirk=0x4004 to override the default value without recompilation. It's a raw value, so user needs to check the source code for the meaning of each bit.
Signed-off-by: Takashi Iwai tiwai@suse.de
v1->v2: override the quirk value completely
sound/soc/intel/boards/bytcr_rt5640.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/sound/soc/intel/boards/bytcr_rt5640.c b/sound/soc/intel/boards/bytcr_rt5640.c index 5c7219fb3aa8..23f5ffdb3731 100644 --- a/sound/soc/intel/boards/bytcr_rt5640.c +++ b/sound/soc/intel/boards/bytcr_rt5640.c @@ -19,6 +19,7 @@ #include <linux/init.h> #include <linux/module.h> +#include <linux/moduleparam.h> #include <linux/platform_device.h> #include <linux/acpi.h> #include <linux/device.h> @@ -58,6 +59,9 @@ struct byt_rt5640_private { }; static unsigned long byt_rt5640_quirk = BYT_RT5640_MCLK_EN; +static unsigned int quirk_override; +module_param_named(quirk, quirk_override, int, 0444); +MODULE_PARM_DESC(quirk, "Board-specific quirk override"); static void log_quirks(struct device *dev) { @@ -806,6 +810,8 @@ static int snd_byt_rt5640_mc_probe(struct platform_device *pdev) /* check quirks before creating card */ dmi_check_system(byt_rt5640_quirk_table);
- if (quirk_override)
byt_rt5640_quirk = quirk_override;sounds fine. I would also change this log_quirks function to signal if the bits set by the user aren't aligned with the driver known quirks or are inconsistent.
Well, we can just add a dev_info() around "if (quirk_override)" block.
I'm going to respin the v3 patch tomorrow with that change. Could you give your ack or review tag I can add to v3?
thanks,
Takashi