From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx48AO6SD0DZeVxg4x3H1n3pHD4Fcudzx6P1n/BFfoS6uZWQ975oNMZltDtKFPM0lOauTWA+I ARC-Seal: i=1; a=rsa-sha256; t=1524406430; cv=none; d=google.com; s=arc-20160816; b=ybT7wInxpxqh08DcX9hojYAYCKc6LXTBYV2Ms5Y8F7/nP5gkGlq3x19/Z4ehurIRcs NiVOU5xXsLMsTjs0duioht2Ia7+/D/hOYLcxVByHjS93QqBLfgKturU2qBb2Cj7KkvYM h1T0cc8NNAibqijaF94ZNSq72SdPfb3Shb4yKmVwxA3yn9E1rq1xg1iiLWbdoYQxbfkJ lnoMlHzh2WvKtfP8nnh2bktagKSfCvBvZhgajAC6enI9pY+WT/h2xB399BckKx4wn75c p4wz665dcCO9Z6ePCXjio28CTdN6BaRx/mMbKiuTCP7jRRxQjp/xWKPv1ZzBkeRwKZzx qSEg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=qIs3j+CF5P3e+m3AgUjQzhuPUDEc/RCksAvRwdh62as=; b=LAXoDcMajnIQWFF6ud2q7iG1JPfRwOXgK4q8WwcEfszfNCR+9rEdH//iOWGAbwEV4z FkIFdcK2HDGLRmORA+Ss+2IDn/uvImDhmuGDSA6RxnIpcSA0ZORid0f49qgqlh4FJYVM acqz/owtI5GJapw0bMKOhmFWN/r3DQQaRv8REByBNcZaZjrvgOeLT87T2tJakOX7vJpb 8yZxSfDgQ370FIHBK2c0gKKRd8aUw3bwTE1E7gpYIW9Cb3G1YgxXkZUnzR6NdqGp5K1C wEvXekZjlHxscJy4yWPEgCnANXxr33wPUn+4sMk8/zj1QHo/adcxunqxUpnmAvsHFxE2 4lFA== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marc Zyngier , Heiko Stuebner Subject: [PATCH 4.9 69/95] drm/rockchip: Clear all interrupts before requesting the IRQ Date: Sun, 22 Apr 2018 15:53:38 +0200 Message-Id: <20180422135213.252429672@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180422135210.432103639@linuxfoundation.org> References: <20180422135210.432103639@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1598455213348332797?= X-GMAIL-MSGID: =?utf-8?q?1598455996964518523?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Marc Zyngier commit 5f9e93fed4d45e9a8f84728aff1a8f2ab8922902 upstream. Calling request_irq() followed by disable_irq() is usually a bad idea, specially if the interrupt can be pending, and you're not yet in a position to handle it. This is exactly what happens on my kevin system when rebooting in a second kernel using kexec: Some interrupt is left pending from the previous kernel, and we take it too early, before disable_irq() could do anything. Let's clear the pending interrupts as we initialize the HW, and move the interrupt request after that point. This ensures that we're in a sane state when the interrupt is requested. Cc: stable@vger.kernel.org Signed-off-by: Marc Zyngier [adapted to recent rockchip-drm changes] Signed-off-by: Heiko Stuebner Link: https://patchwork.freedesktop.org/patch/msgid/20180220130120.5254-2-marc.zyngier@arm.com Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c @@ -1386,6 +1386,9 @@ static int vop_initial(struct vop *vop) usleep_range(10, 20); reset_control_deassert(ahb_rst); + VOP_INTR_SET_TYPE(vop, clear, INTR_MASK, 1); + VOP_INTR_SET_TYPE(vop, enable, INTR_MASK, 0); + memcpy(vop->regsbak, vop->regs, vop->len); for (i = 0; i < vop_data->table_size; i++) @@ -1541,17 +1544,9 @@ static int vop_bind(struct device *dev, mutex_init(&vop->vsync_mutex); - ret = devm_request_irq(dev, vop->irq, vop_isr, - IRQF_SHARED, dev_name(dev), vop); - if (ret) - return ret; - - /* IRQ is initially disabled; it gets enabled in power_on */ - disable_irq(vop->irq); - ret = vop_create_crtc(vop); if (ret) - goto err_enable_irq; + return ret; pm_runtime_enable(&pdev->dev); @@ -1561,13 +1556,19 @@ static int vop_bind(struct device *dev, goto err_disable_pm_runtime; } + ret = devm_request_irq(dev, vop->irq, vop_isr, + IRQF_SHARED, dev_name(dev), vop); + if (ret) + goto err_disable_pm_runtime; + + /* IRQ is initially disabled; it gets enabled in power_on */ + disable_irq(vop->irq); + return 0; err_disable_pm_runtime: pm_runtime_disable(&pdev->dev); vop_destroy_crtc(vop); -err_enable_irq: - enable_irq(vop->irq); /* To balance out the disable_irq above */ return ret; }