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27 Jan 2023 15:11:35 +1030 Received: from agc.crawford.emu.id.au (agc.crawford.emu.id.au [IPv6:fdd2:7aad:d478:1:0:0:cb10:cc07]) (authenticated bits=0) by bits.crawford.emu.id.au (8.17.1/8.17.1) with ESMTPSA id 30R4fIge2462776 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Fri, 27 Jan 2023 15:41:31 +1100 Authentication-Results: bits.crawford.emu.id.au; arc=none smtp.remote-ip=fdd2:7aad:d478:1::cb10:cc07 DKIM-Filter: OpenDKIM Filter v2.11.0 bits.crawford.emu.id.au 30R4fIge2462776 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=crawford.emu.id.au; s=s1; t=1674794492; bh=uoZah0rQxLm7wOzrN2eniIO7ElG39WnTDXpl8eAJTDY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KYDUJsqFEsnpvoE4pqPDqJ0LBgo1GRSiB/Dzdyyc3GAykLfzGfg6d0/12u78LONXc 7nJmp173tCpK2uAuPXgQe5QXIesTNQ1vYqgmVCfMK2KatEeTSN4/57r9zlR8SgTRyE zYrY/HSXCnbrk8SGIYCSh41+Sznrx27UZEUHSREB2vk2+tM5fuDwjceSe7vJzffST5 7Us9MTL6hMGdPeaH9JCmWLhoKrof7u1Zvz5kNOesPz2BRg07mRNf9IkfAK2M+I//Kh 7ls7CavFqDPkzZNwzSY0OfU4duD6AI8qXGPGuW47C4MuMlfLp5fKpBFawaE7jITm/o UzJgVt5AH6czA== From: Frank Crawford To: Jean Delvare , Guenter Roeck Cc: linux-hwmon@vger.kernel.org, Frank Crawford Subject: [PATCH v2 1/7] hwmon: (it87) Allow disabling exiting of configuration mode Date: Fri, 27 Jan 2023 15:41:10 +1100 Message-Id: <20230127044116.1257799-2-frank@crawford.emu.id.au> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230127044116.1257799-1-frank@crawford.emu.id.au> References: <20230127044116.1257799-1-frank@crawford.emu.id.au> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.6.4 (bits.crawford.emu.id.au [IPv6:fdd2:7aad:d478:1:0:0:cb10:cc01]); Fri, 27 Jan 2023 15:41:32 +1100 (AEDT) X-Virus-Scanned: clamav-milter 0.103.7 at bits.crawford.emu.id.au X-Virus-Status: Clean Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org Disabling configuration mode on some chips can result in system hang-ups and access failures to the Super-IO chip at the second SIO address. Never exit configuration mode on these chips to avoid the problem. This patch should be applied in conjunction with a previous one to initialise the second chip for certain mother boards. Signed-off-by: Frank Crawford --- v2: * Convert to use feature flag and related macros rather than a separate field, as suggested in review. * Reverse sense of flag in superio_exit to simplify feature macro. --- drivers/hwmon/it87.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c index a8a6a0ffee82..9d44d1d6f3e9 100644 --- a/drivers/hwmon/it87.c +++ b/drivers/hwmon/it87.c @@ -128,10 +128,12 @@ static inline int superio_enter(int ioreg) return 0; } -static inline void superio_exit(int ioreg) +static inline void superio_exit(int ioreg, bool noexit) { - outb(0x02, ioreg); - outb(0x02, ioreg + 1); + if (!noexit) { + outb(0x02, ioreg); + outb(0x02, ioreg + 1); + } release_region(ioreg, 2); } @@ -300,6 +302,13 @@ struct it87_devices { #define FEAT_PWM_FREQ2 BIT(16) /* Separate pwm freq 2 */ #define FEAT_SIX_TEMP BIT(17) /* Up to 6 temp sensors */ #define FEAT_VIN3_5V BIT(18) /* VIN3 connected to +5V */ +/* + * Disabling configuration mode on some chips can result in system + * hang-ups and access failures to the Super-IO chip at the + * second SIO address. Never exit configuration mode on these + * chips to avoid the problem. + */ +#define FEAT_CONF_NOEXIT BIT(28) /* Chip should not exit conf mode */ static const struct it87_devices it87_devices[] = { [it87] = { @@ -493,6 +502,7 @@ static const struct it87_devices it87_devices[] = { #define has_pwm_freq2(data) ((data)->features & FEAT_PWM_FREQ2) #define has_six_temp(data) ((data)->features & FEAT_SIX_TEMP) #define has_vin3_5v(data) ((data)->features & FEAT_VIN3_5V) +#define has_conf_noexit(data) ((data)->features & FEAT_CONF_NOEXIT) struct it87_sio_data { int sioaddr; @@ -2489,6 +2499,8 @@ static int __init it87_find(int sioaddr, unsigned short *address, goto exit; } + config = &it87_devices[sio_data->type]; + superio_select(sioaddr, PME); if (!(superio_inb(sioaddr, IT87_ACT_REG) & 0x01)) { pr_info("Device not activated, skipping\n"); @@ -2508,8 +2520,6 @@ static int __init it87_find(int sioaddr, unsigned short *address, it87_devices[sio_data->type].suffix, *address, sio_data->revision); - config = &it87_devices[sio_data->type]; - /* in7 (VSB or VCCH5V) is always internal on some chips */ if (has_in7_internal(config)) sio_data->internal |= BIT(1); @@ -2827,7 +2837,7 @@ static int __init it87_find(int sioaddr, unsigned short *address, sio_data->skip_pwm |= dmi_data->skip_pwm; exit: - superio_exit(sioaddr); + superio_exit(sioaddr, has_conf_noexit(config)); return err; } @@ -3213,7 +3223,7 @@ static void it87_resume_sio(struct platform_device *pdev) reg2c); } - superio_exit(data->sioaddr); + superio_exit(data->sioaddr, has_conf_noexit(data)); } static int it87_resume(struct device *dev) -- 2.39.1