Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752921AbcCRLW6 (ORCPT ); Fri, 18 Mar 2016 07:22:58 -0400 Received: from mail-wm0-f42.google.com ([74.125.82.42]:36444 "EHLO mail-wm0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751926AbcCRLWs (ORCPT ); Fri, 18 Mar 2016 07:22:48 -0400 From: Tomeu Vizoso To: linux-kernel@vger.kernel.org Cc: Tomeu Vizoso , Mark Yao , David Airlie , Heiko Stuebner , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org Subject: [PATCH] drm/rockchip: vop: Reset yrgb_mst when re-enabling Date: Fri, 18 Mar 2016 12:22:27 +0100 Message-Id: <1458300147-6472-1-git-send-email-tomeu.vizoso@collabora.com> X-Mailer: git-send-email 2.5.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1607 Lines: 45 When the VOP is re-enabled, it will start scanning right away the framebuffers that were configured from the last time, even if those have been destroyed already. To prevent the VOP from trying to access freed memory, reset the registers that hold pointers to framebuffers right after we can write to them, but before the VOP is awaken from standby. Signed-off-by: Tomeu Vizoso Link: http://lkml.kernel.org/g/CAAObsKAv+05ih5U+=4kic_NsjGMhfxYheHR8xXXmacZs+p5SHw@mail.gmail.com --- drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c index 5e57f5b2e4b0..0df91c28740b 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c @@ -429,6 +429,7 @@ static void vop_dsp_hold_valid_irq_disable(struct vop *vop) static void vop_enable(struct drm_crtc *crtc) { struct vop *vop = to_vop(crtc); + int i; int ret; if (vop->is_enabled) @@ -476,6 +477,18 @@ static void vop_enable(struct drm_crtc *crtc) */ vop->is_enabled = true; + /* + * Before turning the VOP completely on, unset the registers + * containing FB addresses to avoid the HW start scanning old FBs. + */ + for (i = 0; i < vop->data->win_size; i++) { + struct vop_win *vop_win = &vop->win[i]; + const struct vop_win_data *win = vop_win->data; + + VOP_WIN_SET(vop, win, yrgb_mst, 0x0); + VOP_WIN_SET(vop, win, uv_mst, 0x0); + } + spin_lock(&vop->reg_lock); VOP_CTRL_SET(vop, standby, 0); -- 2.5.0