From patchwork Mon Feb 15 19:03:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?M=C3=A5rten_Lindahl?= X-Patchwork-Id: 1440696 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=axis.com header.i=@axis.com header.a=rsa-sha256 header.s=axis-central1 header.b=MQ4bh4Ox; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4DfYft43wsz9sBJ for ; Tue, 16 Feb 2021 06:13:42 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230349AbhBOTNT (ORCPT ); Mon, 15 Feb 2021 14:13:19 -0500 Received: from smtp1.axis.com ([195.60.68.17]:5355 "EHLO smtp1.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230048AbhBOTNR (ORCPT ); Mon, 15 Feb 2021 14:13:17 -0500 X-Greylist: delayed 509 seconds by postgrey-1.27 at vger.kernel.org; Mon, 15 Feb 2021 14:13:15 EST DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=axis.com; q=dns/txt; s=axis-central1; t=1613416396; x=1644952396; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=wFNT4rSQCM8LHPCDltTRqOCKD9W6vi98OPConvKvLXY=; b=MQ4bh4Ox9dnYXEryFOKVd5d9KjEAu+73/+YTglVvwMUQ1xUAkVVuFZ5O bZPZIjyqES0kLONLIoApks/CKaa81TXpg/SIXaPPx/WZXG8toVuTfL5aL noy2jm0evg/Jo35Qkmw+ZNEXHxB188oeiTDakCo3lz3wD+E9H0EX8hafm zV1FoBpm891YNi/XVaZrfS+2LMQCez6NXevcmAkakoY06k2lY2VBx8h+H 7J8xgSm16VMoX0OsVXUy3hl2wxwazb9j8LhbuBwwv7n/jeD9D34KTuEgW 1v+vu6oFjYN5h4PF4uKHfxiGteO+UvR90h0O9UWowa5oq+uInE1x9cu+a A==; From: =?utf-8?q?M=C3=A5rten_Lindahl?= To: Krzysztof Kozlowski CC: , =?utf-8?q?M=C3=A5rten_Lindahl?= , , , , Subject: [PATCH] i2c: exynos5: Preserve high speed master code Date: Mon, 15 Feb 2021 20:03:21 +0100 Message-ID: <20210215190322.22094-1-marten.lindahl@axis.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org From: Mårten Lindahl When the controller starts to send a message with the MASTER_ID field set (high speed), the whole I2C_ADDR register is overwritten including MASTER_ID as the SLV_ADDR_MAS field is set. This patch preserves already written fields in I2C_ADDR when writing SLV_ADDR_MAS. Signed-off-by: Mårten Lindahl --- drivers/i2c/busses/i2c-exynos5.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c index 20a9881a0d6c..f2d04c241299 100644 --- a/drivers/i2c/busses/i2c-exynos5.c +++ b/drivers/i2c/busses/i2c-exynos5.c @@ -606,6 +606,7 @@ static void exynos5_i2c_message_start(struct exynos5_i2c *i2c, int stop) u32 i2c_ctl; u32 int_en = 0; u32 i2c_auto_conf = 0; + u32 i2c_addr = 0; u32 fifo_ctl; unsigned long flags; unsigned short trig_lvl; @@ -640,7 +641,12 @@ static void exynos5_i2c_message_start(struct exynos5_i2c *i2c, int stop) int_en |= HSI2C_INT_TX_ALMOSTEMPTY_EN; } - writel(HSI2C_SLV_ADDR_MAS(i2c->msg->addr), i2c->regs + HSI2C_ADDR); + i2c_addr = HSI2C_SLV_ADDR_MAS(i2c->msg->addr); + + if (i2c->op_clock >= I2C_MAX_FAST_MODE_PLUS_FREQ) + i2c_addr |= readl(i2c->regs + HSI2C_ADDR); + + writel(i2c_addr, i2c->regs + HSI2C_ADDR); writel(fifo_ctl, i2c->regs + HSI2C_FIFO_CTL); writel(i2c_ctl, i2c->regs + HSI2C_CTL);