From patchwork Mon Feb 24 19:12:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 11402881 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3EC7B14BC for ; Tue, 25 Feb 2020 08:51:51 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2750E2176D for ; Tue, 25 Feb 2020 08:51:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2750E2176D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=atomide.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5A20A89FC8; Tue, 25 Feb 2020 08:51:08 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from muru.com (muru.com [72.249.23.125]) by gabe.freedesktop.org (Postfix) with ESMTP id D51E96E8CC for ; Mon, 24 Feb 2020 19:12:48 +0000 (UTC) Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 0F8C481DB; Mon, 24 Feb 2020 19:13:31 +0000 (UTC) From: Tony Lindgren To: linux-omap@vger.kernel.org Subject: [PATCH 3/3] bus: ti-sysc: Implement display subsystem reset quirk Date: Mon, 24 Feb 2020 11:12:30 -0800 Message-Id: <20200224191230.30972-4-tony@atomide.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200224191230.30972-1-tony@atomide.com> References: <20200224191230.30972-1-tony@atomide.com> MIME-Version: 1.0 X-Mailman-Approved-At: Tue, 25 Feb 2020 08:50:43 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Nishanth Menon , Tero Kristo , dri-devel@lists.freedesktop.org, Dave Gerlach , Keerthy , Tomi Valkeinen , linux-kernel@vger.kernel.org, Jyri Sarha , "Andrew F . Davis" , Peter Ujfalusi , Faiz Abbas , Laurent Pinchart , Greg Kroah-Hartman , Suman Anna , linux-arm-kernel@lists.infradead.org, Roger Quadros Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The display subsystem (DSS) needs the child outputs disabled for reset. In order to prepare to probe DSS without legacy platform data, let's implement sysc_pre_reset_quirk_dss() similar to what we have for the platform data with omap_dss_reset(). Note that we cannot directly use the old omap_dss_reset() without platform data callbacks and updating omap_dss_reset() to understand struct device. And we will be dropping omap_dss_reset() anyways when all the SoCs are probing with device tree, so let's not mess with the legacy code at all. Cc: Jyri Sarha Cc: Laurent Pinchart Cc: Tomi Valkeinen Signed-off-by: Tony Lindgren Reported-by: Tomi Valkeinen Signed-off-by: Tony Lindgren Reviewed-by: Tomi Valkeinen --- drivers/bus/ti-sysc.c | 131 +++++++++++++++++++++++++- include/linux/platform_data/ti-sysc.h | 1 + 2 files changed, 129 insertions(+), 3 deletions(-) diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -1303,11 +1303,11 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = { SYSC_QUIRK("dcan", 0x48480000, 0x20, -ENODEV, -ENODEV, 0xa3170504, 0xffffffff, SYSC_QUIRK_CLKDM_NOAUTO), SYSC_QUIRK("dss", 0x4832a000, 0, 0x10, 0x14, 0x00000020, 0xffffffff, - SYSC_QUIRK_OPT_CLKS_IN_RESET), + SYSC_QUIRK_OPT_CLKS_IN_RESET | SYSC_MODULE_QUIRK_DSS_RESET), SYSC_QUIRK("dss", 0x58000000, 0, -ENODEV, 0x14, 0x00000040, 0xffffffff, - SYSC_QUIRK_OPT_CLKS_IN_RESET), + SYSC_QUIRK_OPT_CLKS_IN_RESET | SYSC_MODULE_QUIRK_DSS_RESET), SYSC_QUIRK("dss", 0x58000000, 0, -ENODEV, 0x14, 0x00000061, 0xffffffff, - SYSC_QUIRK_OPT_CLKS_IN_RESET), + SYSC_QUIRK_OPT_CLKS_IN_RESET | SYSC_MODULE_QUIRK_DSS_RESET), SYSC_QUIRK("dwc3", 0x48880000, 0, 0x10, -ENODEV, 0x500a0200, 0xffffffff, SYSC_QUIRK_CLKDM_NOAUTO), SYSC_QUIRK("dwc3", 0x488c0000, 0, 0x10, -ENODEV, 0x500a0200, 0xffffffff, @@ -1468,6 +1468,128 @@ static void sysc_init_revision_quirks(struct sysc *ddata) } } +/* + * DSS needs dispc outputs disabled to reset modules. Returns mask of + * enabled DSS interrupts. Eventually we may be able to do this on + * dispc init rather than top-level DSS init. + */ +static u32 sysc_quirk_dispc(struct sysc *ddata, int dispc_offset, + bool disable) +{ + bool lcd_en, digit_en, lcd2_en = false, lcd3_en = false; + const int lcd_en_mask = BIT(0), digit_en_mask = BIT(1); + int manager_count; + bool framedonetv_irq; + u32 val, irq_mask = 0; + + switch (sysc_soc->soc) { + case SOC_2420 ... SOC_3630: + manager_count = 2; + framedonetv_irq = false; + break; + case SOC_4430 ... SOC_4470: + manager_count = 3; + break; + case SOC_5430: + case SOC_DRA7: + manager_count = 4; + break; + case SOC_AM4: + manager_count = 1; + break; + case SOC_UNKNOWN: + default: + return 0; + }; + + /* Remap the whole module range to be able to reset dispc outputs */ + devm_iounmap(ddata->dev, ddata->module_va); + ddata->module_va = devm_ioremap(ddata->dev, + ddata->module_pa, + ddata->module_size); + if (!ddata->module_va) + return -EIO; + + /* DISP_CONTROL */ + val = sysc_read(ddata, dispc_offset + 0x40); + lcd_en = val & lcd_en_mask; + digit_en = val & digit_en_mask; + if (lcd_en) + irq_mask |= BIT(0); /* FRAMEDONE */ + if (digit_en) { + if (framedonetv_irq) + irq_mask |= BIT(24); /* FRAMEDONETV */ + else + irq_mask |= BIT(2) | BIT(3); /* EVSYNC bits */ + } + if (disable & (lcd_en | digit_en)) + sysc_write(ddata, dispc_offset + 0x40, + val & ~(lcd_en_mask | digit_en_mask)); + + if (manager_count <= 2) + return irq_mask; + + /* DISPC_CONTROL2 */ + val = sysc_read(ddata, dispc_offset + 0x238); + lcd2_en = val & lcd_en_mask; + if (lcd2_en) + irq_mask |= BIT(22); /* FRAMEDONE2 */ + if (disable && lcd2_en) + sysc_write(ddata, dispc_offset + 0x238, + val & ~lcd_en_mask); + + if (manager_count <= 3) + return irq_mask; + + /* DISPC_CONTROL3 */ + val = sysc_read(ddata, dispc_offset + 0x848); + lcd3_en = val & lcd_en_mask; + if (lcd3_en) + irq_mask |= BIT(30); /* FRAMEDONE3 */ + if (disable && lcd3_en) + sysc_write(ddata, dispc_offset + 0x848, + val & ~lcd_en_mask); + + return irq_mask; +} + +/* DSS needs child outputs disabled and SDI registers cleared for reset */ +static void sysc_pre_reset_quirk_dss(struct sysc *ddata) +{ + const int dispc_offset = 0x1000; + int error; + u32 irq_mask, val; + + /* Get enabled outputs */ + irq_mask = sysc_quirk_dispc(ddata, dispc_offset, false); + if (!irq_mask) + return; + + /* Clear IRQSTATUS */ + sysc_write(ddata, 0x1000 + 0x18, irq_mask); + + /* Disable outputs */ + val = sysc_quirk_dispc(ddata, dispc_offset, true); + + /* Poll IRQSTATUS */ + error = readl_poll_timeout(ddata->module_va + dispc_offset + 0x18, + val, val != irq_mask, 100, 50); + if (error) + dev_warn(ddata->dev, "%s: timed out %08x !+ %08x\n", + __func__, val, irq_mask); + + if (sysc_soc->soc == SOC_3430) { + /* Clear DSS_SDI_CONTROL */ + sysc_write(ddata, dispc_offset + 0x44, 0); + + /* Clear DSS_PLL_CONTROL */ + sysc_write(ddata, dispc_offset + 0x48, 0); + } + + /* Clear DSS_CONTROL to switch DSS clock sources to PRCM if not */ + sysc_write(ddata, dispc_offset + 0x40, 0); +} + /* 1-wire needs module's internal clocks enabled for reset */ static void sysc_pre_reset_quirk_hdq1w(struct sysc *ddata) { @@ -1606,6 +1728,9 @@ static void sysc_init_module_quirks(struct sysc *ddata) if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_AESS) ddata->module_enable_quirk = sysc_module_enable_quirk_aess; + if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_DSS_RESET) + ddata->pre_reset_quirk = sysc_pre_reset_quirk_dss; + if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_RTC_UNLOCK) { ddata->module_unlock_quirk = sysc_module_unlock_quirk_rtc; ddata->module_lock_quirk = sysc_module_lock_quirk_rtc; diff --git a/include/linux/platform_data/ti-sysc.h b/include/linux/platform_data/ti-sysc.h --- a/include/linux/platform_data/ti-sysc.h +++ b/include/linux/platform_data/ti-sysc.h @@ -49,6 +49,7 @@ struct sysc_regbits { s8 emufree_shift; }; +#define SYSC_MODULE_QUIRK_DSS_RESET BIT(23) #define SYSC_MODULE_QUIRK_RTC_UNLOCK BIT(22) #define SYSC_QUIRK_CLKDM_NOAUTO BIT(21) #define SYSC_QUIRK_FORCE_MSTANDBY BIT(20)