From patchwork Mon Dec 10 07:09:12 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lokesh Vutla X-Patchwork-Id: 1855521 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id 113693FCA5 for ; Mon, 10 Dec 2012 07:14:18 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1ThxW9-00052H-LK; Mon, 10 Dec 2012 07:11:11 +0000 Received: from devils.ext.ti.com ([198.47.26.153]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1ThxUX-0004MU-0k for linux-arm-kernel@lists.infradead.org; Mon, 10 Dec 2012 07:09:33 +0000 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id qBA79OUJ013217; Mon, 10 Dec 2012 01:09:25 -0600 Received: from DBDE71.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id qBA79O4J004481; Mon, 10 Dec 2012 12:39:24 +0530 (IST) Received: from dbdp32.itg.ti.com (172.24.170.251) by DBDE71.ent.ti.com (172.24.170.149) with Microsoft SMTP Server id 14.1.323.3; Mon, 10 Dec 2012 12:39:24 +0530 Received: from a0131933lt.apr.dhcp.ti.com (smtpvbd.itg.ti.com [172.24.170.250]) by dbdp32.itg.ti.com (8.13.8/8.13.8) with ESMTP id qBA79KlL030499; Mon, 10 Dec 2012 12:39:23 +0530 From: Lokesh Vutla To: Subject: [PATCH 3/9] memory: emif: handle overflow for timing for LP mode Date: Mon, 10 Dec 2012 12:39:12 +0530 Message-ID: <1355123358-5273-4-git-send-email-lokeshvutla@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1355123358-5273-1-git-send-email-lokeshvutla@ti.com> References: <1355123358-5273-1-git-send-email-lokeshvutla@ti.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20121210_020929_447839_5BE9C6A2 X-CRM114-Status: GOOD ( 11.41 ) X-Spam-Score: -7.6 (-------) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-7.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [198.47.26.153 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Nishanth Menon , b-cousson@ti.com, lokeshvutla@ti.com, gregkh@linuxfoundation.org, santosh.shilimkar@ti.com, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Nishanth Menon In case the custom timings provide values which overflow the maximum possible field value, warn and use maximum permissible value. Signed-off-by: Nishanth Menon --- drivers/memory/emif.c | 36 ++++++++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 8 deletions(-) diff --git a/drivers/memory/emif.c b/drivers/memory/emif.c index 69a480d..27a3ce1 100644 --- a/drivers/memory/emif.c +++ b/drivers/memory/emif.c @@ -714,6 +714,8 @@ static u32 get_pwr_mgmt_ctrl(u32 freq, struct emif_data *emif, u32 ip_rev) u32 timeout_perf = EMIF_LP_MODE_TIMEOUT_PERFORMANCE; u32 timeout_pwr = EMIF_LP_MODE_TIMEOUT_POWER; u32 freq_threshold = EMIF_LP_MODE_FREQ_THRESHOLD; + u32 mask; + u8 shift; struct emif_custom_configs *cust_cfgs = emif->plat_data->custom_configs; @@ -738,27 +740,45 @@ static u32 get_pwr_mgmt_ctrl(u32 freq, struct emif_data *emif, u32 ip_rev) switch (lpmode) { case EMIF_LP_MODE_CLOCK_STOP: - pwr_mgmt_ctrl = (timeout << CS_TIM_SHIFT) | - SR_TIM_MASK | PD_TIM_MASK; + shift = CS_TIM_SHIFT; + mask = CS_TIM_MASK; break; case EMIF_LP_MODE_SELF_REFRESH: /* Workaround for errata i735 */ if (timeout < 6) timeout = 6; - pwr_mgmt_ctrl = (timeout << SR_TIM_SHIFT) | - CS_TIM_MASK | PD_TIM_MASK; + shift = SR_TIM_SHIFT; + mask = SR_TIM_MASK; break; case EMIF_LP_MODE_PWR_DN: - pwr_mgmt_ctrl = (timeout << PD_TIM_SHIFT) | - CS_TIM_MASK | SR_TIM_MASK; + shift = PD_TIM_SHIFT; + mask = PD_TIM_MASK; break; case EMIF_LP_MODE_DISABLE: default: - pwr_mgmt_ctrl = CS_TIM_MASK | - PD_TIM_MASK | SR_TIM_MASK; + mask = 0; + shift = 0; + break; + } + /* Round to maximum in case of overflow, BUT warn! */ + if (lpmode != EMIF_LP_MODE_DISABLE && timeout > mask >> shift) { + pr_err("TIMEOUT Overflow - lpmode=%d perf=%d pwr=%d freq=%d\n", + lpmode, + timeout_perf, + timeout_pwr, + freq_threshold); + WARN(1, "timeout=0x%02x greater than 0x%02x. Using max\n", + timeout, mask >> shift); + timeout = mask >> shift; } + /* Setup required timing */ + pwr_mgmt_ctrl = (timeout << shift) & mask; + /* setup a default mask for rest of the modes */ + pwr_mgmt_ctrl |= (SR_TIM_MASK | CS_TIM_MASK | PD_TIM_MASK) & + ~mask; + /* No CS_TIM in EMIF_4D5 */ if (ip_rev == EMIF_4D5) pwr_mgmt_ctrl &= ~CS_TIM_MASK;