Hi, Dmitry, Thanks for your question!
Since the controller will change the working freq when the system encounter the power noises, like display patterns or on/off, the environment radiation, and charger noises, etc. The i2c bus will have data error(rarely) randomly cause by the freq change in the old version fw. We found this issue and fix it in the latest version just one month ago. The fw guy worry about this issue will have the chance to make the update failed in old version and would like to increase the retry number to secure the update process. But, yes, you are right, 3 or 10 for the probability are just taking different level risk. I will roll back it to 3. Beside the retry number, I will modify the sleep time to 2500ms in sw_reset. The origin value is 200ms, it includes the loading fw & boot up to the main function. The main function will do algorithm initialize and touch calibration about 1.1 second. The touch calibration will scan the best working freq and it also has high risk when doing fw update. It is our mistake for not take the touch calibration into the consideration. And again, thanks for your help! BR, Hn.chen -----Original Message----- From: Dmitry Torokhov [mailto:dmitry.torok...@gmail.com] Sent: Friday, July 10, 2015 2:06 AM To: Hn Chen Cc: linux-in...@vger.kernel.org; linux-kernel@vger.kernel.org; charliemoo...@google.com Subject: Re: [PATCH] Input: wdt87xx_i2c - Add a prodcut_id attribute in sysfs Hi Hn, On Thu, Jul 09, 2015 at 11:00:43PM +0800, HungNien Chen wrote: > Signed-off-by: HungNien Chen <hn.c...@weidahitech.com> > --- > drivers/input/touchscreen/wdt87xx_i2c.c | 68 > ++++++++++++++++++++++++++++++++- > 1 file changed, 66 insertions(+), 2 deletions(-) > > diff --git a/drivers/input/touchscreen/wdt87xx_i2c.c > b/drivers/input/touchscreen/wdt87xx_i2c.c > index fb92ae1..b97cb4f 100644 > --- a/drivers/input/touchscreen/wdt87xx_i2c.c > +++ b/drivers/input/touchscreen/wdt87xx_i2c.c > @@ -23,7 +23,7 @@ > #include <asm/unaligned.h> > > #define WDT87XX_NAME "wdt87xx_i2c" > -#define WDT87XX_DRV_VER "0.9.6" > +#define WDT87XX_DRV_VER "0.9.7" > #define WDT87XX_FW_NAME "wdt87xx_fw.bin" > #define WDT87XX_CFG_NAME "wdt87xx_cfg.bin" > > @@ -39,7 +39,7 @@ > #define WDT_FIRMWARE_ID 0xa9e368f5 > > #define PG_SIZE 0x1000 > -#define MAX_RETRIES 3 > +#define MAX_RETRIES 10 I need to understand better why we need to increase number of retries. Why would writing firmware/config page fail? We already retry 3 times (which I am not too happy about) and now we need to try 10 times? It seems we are trying to paper over a bigger problem. > > #define MAX_UNIT_AXIS 0x7FFF > > @@ -85,6 +85,11 @@ > #define CTL_PARAM_OFFSET_PHY_H 24 > #define CTL_PARAM_OFFSET_FACTOR 32 > > +/* The definition of the device descriptor */ > +#define GD_DEVICE 1 > +#define DEV_DESC_OFFSET_VID 8 > +#define DEV_DESC_OFFSET_PID 10 > + > /* Communication commands */ > #define PACKET_SIZE 56 > #define VND_REQ_READ 0x06 > @@ -165,6 +170,8 @@ struct wdt87xx_sys_param { > u16 scaling_factor; > u32 max_x; > u32 max_y; > + u16 vendor_id; > + u16 product_id; The vendor and product id of the device usually go into input dveice: input->id.vendor input->id.product the custom attributes should be created for data that is not covered by the standard attributes (like you have with config_csum or fw_version). Thanks. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
