From patchwork Mon Mar 14 11:18:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tinghan Shen X-Patchwork-Id: 12780035 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19135C433F5 for ; Mon, 14 Mar 2022 11:18:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237631AbiCNLT0 (ORCPT ); Mon, 14 Mar 2022 07:19:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238835AbiCNLT0 (ORCPT ); Mon, 14 Mar 2022 07:19:26 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F19013CEA; Mon, 14 Mar 2022 04:18:15 -0700 (PDT) X-UUID: 7b7a253798f54e6097b88de18a26eef3-20220314 X-UUID: 7b7a253798f54e6097b88de18a26eef3-20220314 Received: from mtkcas11.mediatek.inc [(172.21.101.40)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 940603900; Mon, 14 Mar 2022 19:18:10 +0800 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs07n2.mediatek.inc (172.21.101.141) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 14 Mar 2022 19:18:09 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 14 Mar 2022 19:18:09 +0800 From: Tinghan Shen To: Bjorn Andersson , Mathieu Poirier , Matthias Brugger CC: , , , , AngeloGioacchino Del Regno , , Tinghan Shen Subject: [PATCH v3] remoteproc: mediatek: fix side effect of mt8195 sram power on Date: Mon, 14 Mar 2022 19:18:06 +0800 Message-ID: <20220314111806.28168-1-tinghan.shen@mediatek.com> X-Mailer: git-send-email 2.15.GIT MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org The definition of L1TCM_SRAM_PDN bits on mt8195 is different to mt8192. L1TCM_SRAM_PDN bits[3:0] control the power of mt8195 L1TCM SRAM. L1TCM_SRAM_PDN bits[7:4] control the access path to EMI for SCP. These bits have to be powered on to allow EMI access for SCP. Bits[7:4] also affect audio DSP because audio DSP and SCP are placed on the same hardware bus. If SCP cannot access EMI, audio DSP is blocked too. L1TCM_SRAM_PDN bits[31:8] are not used. This fix removes modification of bits[7:4] when power on/off mt8195 SCP L1TCM. It's because the modification introduces a short period of time blocking audio DSP to access EMI. This was not a problem until we have to load both SCP module and audio DSP module. audio DSP needs to access EMI because it has source/data on DRAM. Audio DSP will have unexpected behavior when it accesses EMI and the SCP driver blocks the EMI path at the same time. Signed-off-by: Tinghan Shen Reviewed-by: AngeloGioacchino Del Regno Reviewed-by: Matthias Brugger --- v3: fix build error v2: apply comments about macro definition and function calls --- drivers/remoteproc/mtk_common.h | 2 + drivers/remoteproc/mtk_scp.c | 67 +++++++++++++++++++++++++-------- 2 files changed, 53 insertions(+), 16 deletions(-) diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h index 5ff3867c72f3..ff954a06637c 100644 --- a/drivers/remoteproc/mtk_common.h +++ b/drivers/remoteproc/mtk_common.h @@ -51,6 +51,8 @@ #define MT8192_CORE0_WDT_IRQ 0x10030 #define MT8192_CORE0_WDT_CFG 0x10034 +#define MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS GENMASK(7, 4) + #define SCP_FW_VER_LEN 32 #define SCP_SHARE_BUFFER_SIZE 288 diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c index dcddb33e9997..d498f6354cd0 100644 --- a/drivers/remoteproc/mtk_scp.c +++ b/drivers/remoteproc/mtk_scp.c @@ -365,22 +365,22 @@ static int mt8183_scp_before_load(struct mtk_scp *scp) return 0; } -static void mt8192_power_on_sram(void __iomem *addr) +static void scp_sram_power_on(void __iomem *addr, u32 reserved_mask) { int i; for (i = 31; i >= 0; i--) - writel(GENMASK(i, 0), addr); + writel(GENMASK(i, 0) & ~reserved_mask, addr); writel(0, addr); } -static void mt8192_power_off_sram(void __iomem *addr) +static void scp_sram_power_off(void __iomem *addr, u32 reserved_mask) { int i; writel(0, addr); for (i = 0; i < 32; i++) - writel(GENMASK(i, 0), addr); + writel(GENMASK(i, 0) & ~reserved_mask, addr); } static int mt8192_scp_before_load(struct mtk_scp *scp) @@ -391,11 +391,32 @@ static int mt8192_scp_before_load(struct mtk_scp *scp) writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET); /* enable SRAM clock */ - mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0); - mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1); - mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2); - mt8192_power_on_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN); - mt8192_power_on_sram(scp->reg_base + MT8192_CPU0_SRAM_PD); + scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0); + scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0); + scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0); + scp_sram_power_on(scp->reg_base + MT8192_L1TCM_SRAM_PDN, 0); + scp_sram_power_on(scp->reg_base + MT8192_CPU0_SRAM_PD, 0); + + /* enable MPU for all memory regions */ + writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF); + + return 0; +} + +static int mt8195_scp_before_load(struct mtk_scp *scp) +{ + /* clear SPM interrupt, SCP2SPM_IPC_CLR */ + writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR); + + writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET); + + /* enable SRAM clock */ + scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0); + scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0); + scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0); + scp_sram_power_on(scp->reg_base + MT8192_L1TCM_SRAM_PDN, + MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS); + scp_sram_power_on(scp->reg_base + MT8192_CPU0_SRAM_PD, 0); /* enable MPU for all memory regions */ writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF); @@ -551,11 +572,25 @@ static void mt8183_scp_stop(struct mtk_scp *scp) static void mt8192_scp_stop(struct mtk_scp *scp) { /* Disable SRAM clock */ - mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0); - mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1); - mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2); - mt8192_power_off_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN); - mt8192_power_off_sram(scp->reg_base + MT8192_CPU0_SRAM_PD); + scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0); + scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0); + scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0); + scp_sram_power_off(scp->reg_base + MT8192_L1TCM_SRAM_PDN, 0); + scp_sram_power_off(scp->reg_base + MT8192_CPU0_SRAM_PD, 0); + + /* Disable SCP watchdog */ + writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG); +} + +static void mt8195_scp_stop(struct mtk_scp *scp) +{ + /* Disable SRAM clock */ + scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0); + scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0); + scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0); + scp_sram_power_off(scp->reg_base + MT8192_L1TCM_SRAM_PDN, + MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS); + scp_sram_power_off(scp->reg_base + MT8192_CPU0_SRAM_PD, 0); /* Disable SCP watchdog */ writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG); @@ -888,11 +923,11 @@ static const struct mtk_scp_of_data mt8192_of_data = { static const struct mtk_scp_of_data mt8195_of_data = { .scp_clk_get = mt8195_scp_clk_get, - .scp_before_load = mt8192_scp_before_load, + .scp_before_load = mt8195_scp_before_load, .scp_irq_handler = mt8192_scp_irq_handler, .scp_reset_assert = mt8192_scp_reset_assert, .scp_reset_deassert = mt8192_scp_reset_deassert, - .scp_stop = mt8192_scp_stop, + .scp_stop = mt8195_scp_stop, .scp_da_to_va = mt8192_scp_da_to_va, .host_to_scp_reg = MT8192_GIPC_IN_SET, .host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,