From patchwork Fri Sep 25 06:31:57 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Liao X-Patchwork-Id: 7262421 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 6E46B9F380 for ; Fri, 25 Sep 2015 06:34:41 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4BF6420B00 for ; Fri, 25 Sep 2015 06:34:40 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1FD4A20AE8 for ; Fri, 25 Sep 2015 06:34:39 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZfMYe-0000Y9-L5; Fri, 25 Sep 2015 06:32:36 +0000 Received: from [210.61.82.183] (helo=mailgw01.mediatek.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZfMYZ-0000Wj-Ut; Fri, 25 Sep 2015 06:32:34 +0000 X-Listener-Flag: 11101 Received: from mtkhts07.mediatek.inc [(172.21.101.69)] by mailgw01.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 1372074227; Fri, 25 Sep 2015 14:32:01 +0800 Received: from mtksdtcf04.mediatek.inc (10.21.12.144) by mtkhts07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.181.6; Fri, 25 Sep 2015 14:31:58 +0800 From: James Liao To: Subject: [PATCH] soc: mediatek: Fix random hang up issue while kernel init Date: Fri, 25 Sep 2015 14:31:57 +0800 Message-ID: <1443162717-64831-1-git-send-email-jamesjj.liao@mediatek.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150924_233232_293791_03B83054 X-CRM114-Status: GOOD ( 18.92 ) X-Spam-Score: -1.1 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, srv_heupstream@mediatek.com, Kevin Hilman , linux-kernel@vger.kernel.org, Daniel Kurtz , James Liao , linux-mediatek@lists.infradead.org, Sascha Hauer , Matthias Brugger Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In kernel late init, it turns off all unused clocks, which needs to access subsystem registers such as VENC and VENC_LT. Accessing MT8173 VENC registers needs two top clocks, mm_sel and venc_sel. Accessing VENC_LT registers needs mm_sel and venclt_sel. So we need to keep these clocks on before accessing their registers. This patch keeps venc_sel / venclt_sel clock on when VENC / VENC_LT's power is on, to prevent system hang up while accessing its registeres. Signed-off-by: James Liao Reviewed-by: Daniel Kurtz --- This patch is based on v4.3-rc2, to fix system hanging up issue while disabling unused clocks. arch/arm64/boot/dts/mediatek/mt8173.dtsi | 6 ++- drivers/soc/mediatek/mtk-scpsys.c | 67 +++++++++++++++++++++----------- 2 files changed, 48 insertions(+), 25 deletions(-) diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi index d18ee42..188917f 100644 --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi @@ -227,8 +227,10 @@ #power-domain-cells = <1>; reg = <0 0x10006000 0 0x1000>; clocks = <&clk26m>, - <&topckgen CLK_TOP_MM_SEL>; - clock-names = "mfg", "mm"; + <&topckgen CLK_TOP_MM_SEL>, + <&topckgen CLK_TOP_VENC_SEL>, + <&topckgen CLK_TOP_VENC_LT_SEL>; + clock-names = "mfg", "mm", "venc", "venc_lt"; infracfg = <&infracfg>; }; diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c index 164a7d8..06032ba 100644 --- a/drivers/soc/mediatek/mtk-scpsys.c +++ b/drivers/soc/mediatek/mtk-scpsys.c @@ -54,12 +54,16 @@ #define PWR_STATUS_USB BIT(25) enum clk_id { + MT8173_CLK_NONE, MT8173_CLK_MM, MT8173_CLK_MFG, - MT8173_CLK_NONE, - MT8173_CLK_MAX = MT8173_CLK_NONE, + MT8173_CLK_VENC, + MT8173_CLK_VENC_LT, + MT8173_CLK_MAX, }; +#define MAX_CLKS 2 + struct scp_domain_data { const char *name; u32 sta_mask; @@ -67,7 +71,7 @@ struct scp_domain_data { u32 sram_pdn_bits; u32 sram_pdn_ack_bits; u32 bus_prot_mask; - enum clk_id clk_id; + enum clk_id clk_id[MAX_CLKS]; }; static const struct scp_domain_data scp_domain_data[] __initconst = { @@ -77,7 +81,7 @@ static const struct scp_domain_data scp_domain_data[] __initconst = { .ctl_offs = SPM_VDE_PWR_CON, .sram_pdn_bits = GENMASK(11, 8), .sram_pdn_ack_bits = GENMASK(12, 12), - .clk_id = MT8173_CLK_MM, + .clk_id = {MT8173_CLK_MM}, }, [MT8173_POWER_DOMAIN_VENC] = { .name = "venc", @@ -85,7 +89,7 @@ static const struct scp_domain_data scp_domain_data[] __initconst = { .ctl_offs = SPM_VEN_PWR_CON, .sram_pdn_bits = GENMASK(11, 8), .sram_pdn_ack_bits = GENMASK(15, 12), - .clk_id = MT8173_CLK_MM, + .clk_id = {MT8173_CLK_MM, MT8173_CLK_VENC}, }, [MT8173_POWER_DOMAIN_ISP] = { .name = "isp", @@ -93,7 +97,7 @@ static const struct scp_domain_data scp_domain_data[] __initconst = { .ctl_offs = SPM_ISP_PWR_CON, .sram_pdn_bits = GENMASK(11, 8), .sram_pdn_ack_bits = GENMASK(13, 12), - .clk_id = MT8173_CLK_MM, + .clk_id = {MT8173_CLK_MM}, }, [MT8173_POWER_DOMAIN_MM] = { .name = "mm", @@ -101,7 +105,7 @@ static const struct scp_domain_data scp_domain_data[] __initconst = { .ctl_offs = SPM_DIS_PWR_CON, .sram_pdn_bits = GENMASK(11, 8), .sram_pdn_ack_bits = GENMASK(12, 12), - .clk_id = MT8173_CLK_MM, + .clk_id = {MT8173_CLK_MM}, .bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MM_M0 | MT8173_TOP_AXI_PROT_EN_MM_M1, }, @@ -111,7 +115,7 @@ static const struct scp_domain_data scp_domain_data[] __initconst = { .ctl_offs = SPM_VEN2_PWR_CON, .sram_pdn_bits = GENMASK(11, 8), .sram_pdn_ack_bits = GENMASK(15, 12), - .clk_id = MT8173_CLK_MM, + .clk_id = {MT8173_CLK_MM, MT8173_CLK_VENC_LT}, }, [MT8173_POWER_DOMAIN_AUDIO] = { .name = "audio", @@ -119,7 +123,7 @@ static const struct scp_domain_data scp_domain_data[] __initconst = { .ctl_offs = SPM_AUDIO_PWR_CON, .sram_pdn_bits = GENMASK(11, 8), .sram_pdn_ack_bits = GENMASK(15, 12), - .clk_id = MT8173_CLK_NONE, + .clk_id = {MT8173_CLK_NONE}, }, [MT8173_POWER_DOMAIN_USB] = { .name = "usb", @@ -127,7 +131,7 @@ static const struct scp_domain_data scp_domain_data[] __initconst = { .ctl_offs = SPM_USB_PWR_CON, .sram_pdn_bits = GENMASK(11, 8), .sram_pdn_ack_bits = GENMASK(15, 12), - .clk_id = MT8173_CLK_NONE, + .clk_id = {MT8173_CLK_NONE}, }, [MT8173_POWER_DOMAIN_MFG_ASYNC] = { .name = "mfg_async", @@ -135,7 +139,7 @@ static const struct scp_domain_data scp_domain_data[] __initconst = { .ctl_offs = SPM_MFG_ASYNC_PWR_CON, .sram_pdn_bits = GENMASK(11, 8), .sram_pdn_ack_bits = 0, - .clk_id = MT8173_CLK_MFG, + .clk_id = {MT8173_CLK_MFG}, }, [MT8173_POWER_DOMAIN_MFG_2D] = { .name = "mfg_2d", @@ -143,7 +147,7 @@ static const struct scp_domain_data scp_domain_data[] __initconst = { .ctl_offs = SPM_MFG_2D_PWR_CON, .sram_pdn_bits = GENMASK(11, 8), .sram_pdn_ack_bits = GENMASK(13, 12), - .clk_id = MT8173_CLK_NONE, + .clk_id = {MT8173_CLK_NONE}, }, [MT8173_POWER_DOMAIN_MFG] = { .name = "mfg", @@ -151,7 +155,7 @@ static const struct scp_domain_data scp_domain_data[] __initconst = { .ctl_offs = SPM_MFG_PWR_CON, .sram_pdn_bits = GENMASK(13, 8), .sram_pdn_ack_bits = GENMASK(21, 16), - .clk_id = MT8173_CLK_NONE, + .clk_id = {MT8173_CLK_NONE}, .bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MFG_S | MT8173_TOP_AXI_PROT_EN_MFG_M0 | MT8173_TOP_AXI_PROT_EN_MFG_M1 | @@ -166,7 +170,7 @@ struct scp; struct scp_domain { struct generic_pm_domain genpd; struct scp *scp; - struct clk *clk; + struct clk *clk[MAX_CLKS]; u32 sta_mask; void __iomem *ctl_addr; u32 sram_pdn_bits; @@ -212,11 +216,16 @@ static int scpsys_power_on(struct generic_pm_domain *genpd) u32 sram_pdn_ack = scpd->sram_pdn_ack_bits; u32 val; int ret; + int i; + + for (i = 0; i < MAX_CLKS && scpd->clk[i]; i++) { + ret = clk_prepare_enable(scpd->clk[i]); + if (ret) { + for (--i; i >= 0; i--) + clk_disable_unprepare(scpd->clk[i]); - if (scpd->clk) { - ret = clk_prepare_enable(scpd->clk); - if (ret) goto err_clk; + } } val = readl(ctl_addr); @@ -282,7 +291,10 @@ static int scpsys_power_on(struct generic_pm_domain *genpd) return 0; err_pwr_ack: - clk_disable_unprepare(scpd->clk); + for (i = MAX_CLKS - 1; i >= 0; i--) { + if (scpd->clk[i]) + clk_disable_unprepare(scpd->clk[i]); + } err_clk: dev_err(scp->dev, "Failed to power on domain %s\n", genpd->name); @@ -299,6 +311,7 @@ static int scpsys_power_off(struct generic_pm_domain *genpd) u32 pdn_ack = scpd->sram_pdn_ack_bits; u32 val; int ret; + int i; if (scpd->bus_prot_mask) { ret = mtk_infracfg_set_bus_protection(scp->infracfg, @@ -360,8 +373,8 @@ static int scpsys_power_off(struct generic_pm_domain *genpd) expired = true; } - if (scpd->clk) - clk_disable_unprepare(scpd->clk); + for (i = 0; i < MAX_CLKS && scpd->clk[i]; i++) + clk_disable_unprepare(scpd->clk[i]); return 0; @@ -375,7 +388,7 @@ static int __init scpsys_probe(struct platform_device *pdev) { struct genpd_onecell_data *pd_data; struct resource *res; - int i, ret; + int i, j, ret; struct scp *scp; struct clk *clk[MT8173_CLK_MAX]; @@ -405,6 +418,14 @@ static int __init scpsys_probe(struct platform_device *pdev) if (IS_ERR(clk[MT8173_CLK_MFG])) return PTR_ERR(clk[MT8173_CLK_MFG]); + clk[MT8173_CLK_VENC] = devm_clk_get(&pdev->dev, "venc"); + if (IS_ERR(clk[MT8173_CLK_VENC])) + return PTR_ERR(clk[MT8173_CLK_VENC]); + + clk[MT8173_CLK_VENC_LT] = devm_clk_get(&pdev->dev, "venc_lt"); + if (IS_ERR(clk[MT8173_CLK_VENC_LT])) + return PTR_ERR(clk[MT8173_CLK_VENC_LT]); + scp->infracfg = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "infracfg"); if (IS_ERR(scp->infracfg)) { @@ -428,8 +449,8 @@ static int __init scpsys_probe(struct platform_device *pdev) scpd->sram_pdn_bits = data->sram_pdn_bits; scpd->sram_pdn_ack_bits = data->sram_pdn_ack_bits; scpd->bus_prot_mask = data->bus_prot_mask; - if (data->clk_id != MT8173_CLK_NONE) - scpd->clk = clk[data->clk_id]; + for (j = 0; j < MAX_CLKS && data->clk_id[j]; j++) + scpd->clk[j] = clk[data->clk_id[j]]; genpd->name = data->name; genpd->power_off = scpsys_power_off;