Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932140AbbLNIeE (ORCPT ); Mon, 14 Dec 2015 03:34:04 -0500 Received: from regular1.263xmail.com ([211.150.99.133]:51355 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932105AbbLNIeA (ORCPT ); Mon, 14 Dec 2015 03:34:00 -0500 X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-ADDR-CHECKED: 0 X-RL-SENDER: mark.yao@rock-chips.com X-SENDER-IP: 192.253.253.158 X-LOGIN-NAME: mark.yao@rock-chips.com X-UNIQUE-TAG: <926cc755ceb62521ad12a243e29207b1> X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 From: Mark Yao To: David Airlie , Heiko Stuebner , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Mark Yao Subject: [PATCH v2 4/8] drm/rockchip: Optimization vop mode set Date: Mon, 14 Dec 2015 16:32:07 +0800 Message-Id: <1450081931-9709-5-git-send-email-mark.yao@rock-chips.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1450081931-9709-1-git-send-email-mark.yao@rock-chips.com> References: <1450081931-9709-1-git-send-email-mark.yao@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3050 Lines: 97 Rk3288 vop timing registers is immediately register, when configure timing on display active time, will cause tearing. use dclk reset is not a good idea to avoid this tearing. we can avoid tearing by using standby register. Vop standby register will take effect at end of current frame, and go back to work immediately when exit standby. So we can use standby register to protect this context. Signed-off-by: Mark Yao --- Changes in v2: None drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 49 +++++++++++++++++++-------- 1 file changed, 34 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c index 58d7cc4..40cc8ed 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c @@ -1096,10 +1096,40 @@ static void vop_crtc_enable(struct drm_crtc *crtc) vop_enable(crtc); /* - * disable dclk to stop frame scan, so that we can safe config mode and - * enable iommu. + * If dclk rate is zero, mean that scanout is stop, + * we don't need wait any more. */ - clk_disable(vop->dclk); + if (clk_get_rate(vop->dclk)) { + /* + * Rk3288 vop timing register is immediately, when configure + * display timing on display time, may cause tearing. + * + * Vop standby will take effect at end of current frame, + * if dsp hold valid irq happen, it means standby complete. + * + * mode set: + * standby and wait complete --> |---- + * | display time + * |---- + * |---> dsp hold irq + * configure display timing --> | + * standby exit | + * | new frame start. + */ + + reinit_completion(&vop->dsp_hold_completion); + vop_dsp_hold_valid_irq_enable(vop); + + spin_lock(&vop->reg_lock); + + VOP_CTRL_SET(vop, standby, 1); + + spin_unlock(&vop->reg_lock); + + wait_for_completion(&vop->dsp_hold_completion); + + vop_dsp_hold_valid_irq_disable(vop); + } switch (vop->connector_type) { case DRM_MODE_CONNECTOR_LVDS: @@ -1135,20 +1165,9 @@ static void vop_crtc_enable(struct drm_crtc *crtc) VOP_CTRL_SET(vop, vact_st_end, val); VOP_CTRL_SET(vop, vpost_st_end, val); - - /* - * reset dclk, take all mode config affect, so the clk would run in - * correct frame. - */ - reset_control_assert(vop->dclk_rst); - usleep_range(10, 20); - reset_control_deassert(vop->dclk_rst); - clk_set_rate(vop->dclk, adjusted_mode->clock * 1000); -out: - if (clk_enable(vop->dclk) < 0) - dev_err(vop->dev, "failed to enable dclk - %d\n", ret_clk); + VOP_CTRL_SET(vop, standby, 0); } static void vop_crtc_atomic_flush(struct drm_crtc *crtc, -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/