linux-kernel - Re: i2c: jz4780: silence log flood on txabrt

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Date:   Wed, 12 Feb 2020 15:46:19 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Paul Cercueil <paul@...pouillou.net>,
        Paul Boddie <paul@...die.org.uk>,
        Alex Smith <alex.smith@...tec.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        James Hogan <jhogan@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Petr Štetiar <ynezz@...e.cz>,
        Richard Fontana <rfontana@...hat.com>,
        Allison Randal <allison@...utok.net>,
        Stephen Boyd <swboyd@...omium.org>, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-i2c@...r.kernel.org,
        netdev@...r.kernel.org, linux-gpio@...r.kernel.org,
        letux-kernel@...nphoenux.org, kernel@...a-handheld.com
Subject: Re: i2c: jz4780: silence log flood on txabrt

Hi,

> Am 12.02.2020 um 10:46 schrieb Wolfram Sang <wsa@...-dreams.de>:
> 
> 
> The printout for txabrt is way too talkative. Reduce it to the minimum,
> the rest can be gained by I2C core debugging and datasheet information.
> Also, make it a debug printout, it won't help the regular user.
> 
> Reported-by: H. Nikolaus Schaller <hns@...delico.com>
> Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
> ---
> 
> Sorry, normally I don't do counter patches. Yet, this time I realized
> that it would be faster to actually do what I envisioned than to
> describe it in words. I hope you don't feel offended.

No problem. I had thought a little about that myself, but did not
dare to solve more than my problem...

> This driver has
> way too many dev_err anyhow, so this may be a start.
> 
> Obviously, I can't test, does it work for you?

Yes,it works.

Do you want to push your patch yourself, or should I add it to my
patch series and resubmit in a v2?

BR and thanks,
Nikolaus

> 
> drivers/i2c/busses/i2c-jz4780.c | 36 ++-------------------------------
> 1 file changed, 2 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-jz4780.c b/drivers/i2c/busses/i2c-jz4780.c
> index 16a67a64284a..b426fc956938 100644
> --- a/drivers/i2c/busses/i2c-jz4780.c
> +++ b/drivers/i2c/busses/i2c-jz4780.c
> @@ -78,25 +78,6 @@
> 
> #define X1000_I2C_DC_STOP		BIT(9)
> 
> -static const char * const jz4780_i2c_abrt_src[] = {
> -	"ABRT_7B_ADDR_NOACK",
> -	"ABRT_10ADDR1_NOACK",
> -	"ABRT_10ADDR2_NOACK",
> -	"ABRT_XDATA_NOACK",
> -	"ABRT_GCALL_NOACK",
> -	"ABRT_GCALL_READ",
> -	"ABRT_HS_ACKD",
> -	"SBYTE_ACKDET",
> -	"ABRT_HS_NORSTRT",
> -	"SBYTE_NORSTRT",
> -	"ABRT_10B_RD_NORSTRT",
> -	"ABRT_MASTER_DIS",
> -	"ARB_LOST",
> -	"SLVFLUSH_TXFIFO",
> -	"SLV_ARBLOST",
> -	"SLVRD_INTX",
> -};
> -
> #define JZ4780_I2C_INTST_IGC		BIT(11)
> #define JZ4780_I2C_INTST_ISTT		BIT(10)
> #define JZ4780_I2C_INTST_ISTP		BIT(9)
> @@ -576,21 +557,8 @@ static irqreturn_t jz4780_i2c_irq(int irqno, void *dev_id)
> 
> static void jz4780_i2c_txabrt(struct jz4780_i2c *i2c, int src)
> {
> -	int i;
> -
> -	dev_err(&i2c->adap.dev, "txabrt: 0x%08x\n", src);
> -	dev_err(&i2c->adap.dev, "device addr=%x\n",
> -		jz4780_i2c_readw(i2c, JZ4780_I2C_TAR));
> -	dev_err(&i2c->adap.dev, "send cmd count:%d  %d\n",
> -		i2c->cmd, i2c->cmd_buf[i2c->cmd]);
> -	dev_err(&i2c->adap.dev, "receive data count:%d  %d\n",
> -		i2c->cmd, i2c->data_buf[i2c->cmd]);
> -
> -	for (i = 0; i < 16; i++) {
> -		if (src & BIT(i))
> -			dev_dbg(&i2c->adap.dev, "I2C TXABRT[%d]=%s\n",
> -				i, jz4780_i2c_abrt_src[i]);
> -	}
> +	dev_dbg(&i2c->adap.dev, "txabrt: 0x%08x, cmd: %d, send: %d, recv: %d\n",
> +		src, i2c->cmd, i2c->cmd_buf[i2c->cmd], i2c->data_buf[i2c->cmd]);
> }
> 
> static inline int jz4780_i2c_xfer_read(struct jz4780_i2c *i2c,
> -- 
> 2.20.1
>