From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6C85CC31E5B for ; Tue, 18 Jun 2019 22:18:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 488892082C for ; Tue, 18 Jun 2019 22:18:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730769AbfFRWSP (ORCPT ); Tue, 18 Jun 2019 18:18:15 -0400 Received: from gloria.sntech.de ([185.11.138.130]:56562 "EHLO gloria.sntech.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729982AbfFRWSP (ORCPT ); Tue, 18 Jun 2019 18:18:15 -0400 Received: from ip5f5a6320.dynamic.kabel-deutschland.de ([95.90.99.32] helo=diego.localnet) by gloria.sntech.de with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1hdMQS-0003J3-UP; Wed, 19 Jun 2019 00:18:00 +0200 From: Heiko =?ISO-8859-1?Q?St=FCbner?= To: Ezequiel Garcia Cc: Ilia Mirkin , dri-devel , linux-rockchip@lists.infradead.org, Sandy Huang , kernel@collabora.com, Sean Paul , Boris Brezillon , Douglas Anderson , Jacopo Mondi , Rob Herring , Mark Rutland , devicetree , LKML Subject: Re: [PATCH 2/3] drm/rockchip: Add optional support for CRTC gamma LUT Date: Wed, 19 Jun 2019 00:18:00 +0200 Message-ID: <31857290.5uKucqQp3M@diego> In-Reply-To: <20372cd5e56d67b8e896c2d94b3d0d136cc2886e.camel@collabora.com> References: <20190618213406.7667-1-ezequiel@collabora.com> <20372cd5e56d67b8e896c2d94b3d0d136cc2886e.camel@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am Mittwoch, 19. Juni 2019, 00:09:57 CEST schrieb Ezequiel Garcia: > On Tue, 2019-06-18 at 17:47 -0400, Ilia Mirkin wrote: > > On Tue, Jun 18, 2019 at 5:43 PM Ezequiel Garcia wrote: > > > Add an optional CRTC gamma LUT support, and enable it on RK3288. > > > This is currently enabled via a separate address resource, > > > which needs to be specified in the devicetree. > > > > > > The address resource is required because on some SoCs, such as > > > RK3288, the LUT address is after the MMU address, and the latter > > > is supported by a different driver. This prevents the DRM driver > > > from requesting an entire register space. > > > > > > The current implementation works for RGB 10-bit tables, as that > > > is what seems to work on RK3288. > > > > > > Signed-off-by: Ezequiel Garcia > > > --- > > > Changes from RFC: > > > * Request (an optional) address resource for the LUT. > > > * Drop support for RK3399, which doesn't seem to work > > > out of the box and needs more research. > > > * Support pass-thru setting when GAMMA_LUT is NULL. > > > * Add a check for the gamma size, as suggested by Ilia. > > > * Move gamma setting to atomic_commit_tail, as pointed > > > out by Jacopo/Laurent, is the correct way. > > > --- > > > diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c > > > index 12ed5265a90b..5b6edbe2673f 100644 > > > --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c > > > +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c > > > +static void vop_crtc_gamma_set(struct vop *vop, struct drm_crtc *crtc, > > > + struct drm_crtc_state *old_state) > > > +{ > > > + int idle, ret, i; > > > + > > > + spin_lock(&vop->reg_lock); > > > + VOP_REG_SET(vop, common, dsp_lut_en, 0); > > > + vop_cfg_done(vop); > > > + spin_unlock(&vop->reg_lock); > > > + > > > + ret = readx_poll_timeout(vop_dsp_lut_is_enable, vop, > > > + idle, !idle, 5, 30 * 1000); > > > + if (ret) > > > + return; > > > + > > > + spin_lock(&vop->reg_lock); > > > + > > > + if (crtc->state->gamma_lut) { > > > + if (!old_state->gamma_lut || (crtc->state->gamma_lut->base.id != > > > + old_state->gamma_lut->base.id)) > > > + vop_crtc_write_gamma_lut(vop, crtc); > > > + } else { > > > + for (i = 0; i < crtc->gamma_size; i++) { > > > + u32 word; > > > + > > > + word = (i << 20) | (i << 10) | i; > > > + writel(word, vop->lut_regs + i * 4); > > > + } > > > > Note - I'm not in any way familiar with the hardware, so take with a > > grain of salt -- > > > > Could you just leave dsp_lut_en turned off in this case? > > > > That was the first thing I tried :-) > > It seems dsp_lut_en is not to enable the CRTC gamma LUT stage, > but to enable writing the gamma LUT to the internal RAM. I guess that warants a code comment stating this, so we don't end up with well-meant cleanup patches in the future :-) . > > And the specs list no register to enable/disable the gamma LUT. > > Thanks! > Eze > >