From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 25A1F72223; Mon, 29 Jan 2024 17:15:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706548505; cv=none; b=OunaG1rA4NgE/+EdEIXX/EyKJ702vEbLxCWfLNIFHmJSSOus1Sm3zKm6Xorf1SXKU3oQiU1Pv+sA5Ef47Y33BC6tmm0qJIGyTV3mwnkBl0zbVjKhZsybOpm/xpP48U7RV5YlpfE0+LNn1E4FGUmXFdzk7rVZp/CzLpbLATAqs0I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706548505; c=relaxed/simple; bh=i0QxQYwZVU0ROocT+7GUYOCNqKCgizXGrn2SMX68Y6Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rOO5yD0swDVvhV+joib4Q8+dXqVijfJWATgyKcB22xWIVIRkLy6itScKTMMgOHmqT1r8PsBNCeUOoEEI35Ob02H5+fPN417K+UafOT/eA4/+d6TLKhkq3KXrK750r7N5ZOBYckCFduY/EySK+ygkhXLoH5ofUYKBZ64RSjqT04s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=yvi3/YJj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="yvi3/YJj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E031FC433C7; Mon, 29 Jan 2024 17:15:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1706548505; bh=i0QxQYwZVU0ROocT+7GUYOCNqKCgizXGrn2SMX68Y6Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yvi3/YJjjXLxr7gXSpOVPxLKwQZ6nCmcDIMWYr5oAbxUtdSOj6sIxE3KKECwWfkhz pWCqsqBJpX/HReX6ncL0IaxAHe63Sn5Dbxc5HXpncpxRhvh1FoqjQy+wpsfyCE+8bk HxCJlRijR1UWkDuq/oUZtLgZQ9cuhtTyVmABhCZw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Hugo Villeneuve Subject: [PATCH 6.6 133/331] serial: sc16is7xx: convert from _raw_ to _noinc_ regmap functions for FIFO Date: Mon, 29 Jan 2024 09:03:17 -0800 Message-ID: <20240129170018.839923126@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240129170014.969142961@linuxfoundation.org> References: <20240129170014.969142961@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Hugo Villeneuve commit dbf4ab821804df071c8b566d9813083125e6d97b upstream. The SC16IS7XX IC supports a burst mode to access the FIFOs where the initial register address is sent ($00), followed by all the FIFO data without having to resend the register address each time. In this mode, the IC doesn't increment the register address for each R/W byte. The regmap_raw_read() and regmap_raw_write() are functions which can perform IO over multiple registers. They are currently used to read/write from/to the FIFO, and although they operate correctly in this burst mode on the SPI bus, they would corrupt the regmap cache if it was not disabled manually. The reason is that when the R/W size is more than 1 byte, these functions assume that the register address is incremented and handle the cache accordingly. Convert FIFO R/W functions to use the regmap _noinc_ versions in order to remove the manual cache control which was a workaround when using the _raw_ versions. FIFO registers are properly declared as volatile so cache will not be used/updated for FIFO accesses. Fixes: dfeae619d781 ("serial: sc16is7xx") Cc: Signed-off-by: Hugo Villeneuve Link: https://lore.kernel.org/r/20231211171353.2901416-6-hugo@hugovil.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sc16is7xx.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -383,9 +383,7 @@ static void sc16is7xx_fifo_read(struct u struct sc16is7xx_port *s = dev_get_drvdata(port->dev); struct sc16is7xx_one *one = to_sc16is7xx_one(port, port); - regcache_cache_bypass(one->regmap, true); - regmap_raw_read(one->regmap, SC16IS7XX_RHR_REG, s->buf, rxlen); - regcache_cache_bypass(one->regmap, false); + regmap_noinc_read(one->regmap, SC16IS7XX_RHR_REG, s->buf, rxlen); } static void sc16is7xx_fifo_write(struct uart_port *port, u8 to_send) @@ -400,9 +398,7 @@ static void sc16is7xx_fifo_write(struct if (unlikely(!to_send)) return; - regcache_cache_bypass(one->regmap, true); - regmap_raw_write(one->regmap, SC16IS7XX_THR_REG, s->buf, to_send); - regcache_cache_bypass(one->regmap, false); + regmap_noinc_write(one->regmap, SC16IS7XX_THR_REG, s->buf, to_send); } static void sc16is7xx_port_update(struct uart_port *port, u8 reg, @@ -494,6 +490,11 @@ static bool sc16is7xx_regmap_precious(st return false; } +static bool sc16is7xx_regmap_noinc(struct device *dev, unsigned int reg) +{ + return reg == SC16IS7XX_RHR_REG; +} + static int sc16is7xx_set_baud(struct uart_port *port, int baud) { struct sc16is7xx_one *one = to_sc16is7xx_one(port, port); @@ -1697,6 +1698,10 @@ static struct regmap_config regcfg = { .cache_type = REGCACHE_RBTREE, .volatile_reg = sc16is7xx_regmap_volatile, .precious_reg = sc16is7xx_regmap_precious, + .writeable_noinc_reg = sc16is7xx_regmap_noinc, + .readable_noinc_reg = sc16is7xx_regmap_noinc, + .max_raw_read = SC16IS7XX_FIFO_SIZE, + .max_raw_write = SC16IS7XX_FIFO_SIZE, .max_register = SC16IS7XX_EFCR_REG, };