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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 119E26EA90; Fri, 29 Jan 2021 08:11:39 +0000 (UTC) Received: from mail-io1-xd2d.google.com (mail-io1-xd2d.google.com [IPv6:2607:f8b0:4864:20::d2d]) by gabe.freedesktop.org (Postfix) with ESMTPS id CF8516E3F2 for ; Fri, 29 Jan 2021 06:47:10 +0000 (UTC) Received: by mail-io1-xd2d.google.com with SMTP id u8so3143386ior.13 for ; Thu, 28 Jan 2021 22:47:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ruNpGaoKu1dgmqBVSbSLSnQiARAMcjSIrv4Avg5O3MQ=; b=dXjVH3+tVaF8iIhIEF2dsAXoI5HY4uWHATq/S2lnZqb26T4dz4D26pgVXXu5ruBbo0 LJeDJhHqDMTAMay0YTk3wWOOFZYh3ekGGSRPvfFNiJVdgH3l7CuteXJAiAY4Rt3AeYTI 8YeOIhx9PSf1EUvU3G3Jf5FnLO93sYUa5j0uc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ruNpGaoKu1dgmqBVSbSLSnQiARAMcjSIrv4Avg5O3MQ=; b=iXWGe4rGSfRLpAEIMc1sR4qzApuUwL4BGwuScnMtOX0qdRl9W/fFMu5gkaoEjkMegg uwdrMhHbkqcv+SGzqqKxRN7Zf7URMeu3n8Pm+ouFq5bIYvvFcfHTedKtrvx97/iDfqiE eP3UETqfmE1JfUJi4LkzIFY3fL0YN93xmZbvUwSoxfLmukJVSnlEekD+7RYfnlejKWhA LXJVng2DSH8+hOPv+bwxArwKu54HRJQoXgi5i976laWo8j0OG+JRSI8OJIPTcSCLhLTl k9AMQ1mX+QPgD6riwPl31P5RbC/ObVz1chgfU31VjlnSO/OSi6kUkVJQnJeBzHeBvtHI 0Yjg== X-Gm-Message-State: AOAM531AKSDNcwsRPbtzk1MlZo6UKgIid1GTihdab5tBXrS5CoqT/5DQ mGxP8i62f96HcB0Y+8g/4lW9IiUozHSxR/WE3LNdcA== X-Google-Smtp-Source: ABdhPJxkBOTtaYtKaUYyK3d20nT2ufqMqpQmxgNN9Z8BchYpupwidxSHhGg+Id6vxv/zqm8a4z/nzuU79ktpPdKnD8k= X-Received: by 2002:a6b:2d4:: with SMTP id 203mr2621478ioc.0.1611902830115; Thu, 28 Jan 2021 22:47:10 -0800 (PST) MIME-Version: 1.0 References: <20210128112314.1304160-1-hsinyi@chromium.org> <20210128112314.1304160-7-hsinyi@chromium.org> <1611883982.5226.12.camel@mtksdaap41> <1611901808.1947.16.camel@mhfsdcap03> In-Reply-To: <1611901808.1947.16.camel@mhfsdcap03> From: Hsin-Yi Wang Date: Fri, 29 Jan 2021 14:46:44 +0800 Message-ID: Subject: Re: [PATCH v12 6/8] drm/mediatek: enable dither function To: Yongqiang Niu X-Mailman-Approved-At: Fri, 29 Jan 2021 08:11:32 +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: Mark Rutland , Devicetree List , David Airlie , lkml , dri-devel , Matthias Brugger , "moderated list:ARM/Mediatek SoC support" , "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Fri, Jan 29, 2021 at 2:30 PM Yongqiang Niu wrote: > > On Fri, 2021-01-29 at 14:24 +0800, Hsin-Yi Wang wrote: > > On Fri, Jan 29, 2021 at 9:33 AM CK Hu wrote: > > > > > > Hi, Hsin-Yi: > > > > > > On Thu, 2021-01-28 at 19:23 +0800, Hsin-Yi Wang wrote: > > > > From: Yongqiang Niu > > > > > > > > for 5 or 6 bpc panel, we need enable dither function > > > > to improve the display quality > > > > > > > > Signed-off-by: Yongqiang Niu > > > > Signed-off-by: Hsin-Yi Wang > > > > --- > > > > drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 15 +++++++++++++-- > > > > 1 file changed, 13 insertions(+), 2 deletions(-) > > > > > > > > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > > > > index ac2cb25620357..6c8f246380a74 100644 > > > > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > > > > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > > > > @@ -53,6 +53,7 @@ > > > > #define DITHER_EN BIT(0) > > > > #define DISP_DITHER_CFG 0x0020 > > > > #define DITHER_RELAY_MODE BIT(0) > > > > +#define DITHER_ENGINE_EN BIT(1) > > > > #define DISP_DITHER_SIZE 0x0030 > > > > > > > > #define LUT_10BIT_MASK 0x03ff > > > > @@ -314,9 +315,19 @@ static void mtk_dither_config(struct device *dev, unsigned int w, > > > > unsigned int bpc, struct cmdq_pkt *cmdq_pkt) > > > > { > > > > struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev); > > > > + bool enable = (bpc == 5 || bpc == 6); > > > > > > I strongly believe that dither function in dither is identical to the > > > one in gamma and od, and in mtk_dither_set_common(), 'bpc >= > > > MTK_MIN_BPC' is valid, so I believe we need not to limit bpc to 5 or 6. > > > But we should consider the case that bpc is invalid in > > > mtk_dither_set_common(). Invalid case in gamma and od use different way > > > to process. For gamma, dither is default relay mode, so invalid bpc > > > would do nothing in mtk_dither_set_common() and result in relay mode. > > > For od, it set to relay mode first, them invalid bpc would do nothing in > > > mtk_dither_set_common() and result in relay mode. I would like dither, > > > gamma and od to process invalid bpc in the same way. One solution is to > > > set relay mode in mtk_dither_set_common() for invalid bpc. > > > > > > Regards, > > > CK > > > > > > > I modify the mtk_dither_config() to follow: > > > > > > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > > b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > > index ac2cb25620357..5b7fcedb9f9a8 100644 > > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > > @@ -53,6 +53,7 @@ > > #define DITHER_EN BIT(0) > > #define DISP_DITHER_CFG 0x0020 > > #define DITHER_RELAY_MODE BIT(0) > > +#define DITHER_ENGINE_EN BIT(1) > > #define DISP_DITHER_SIZE 0x0030 > > > > #define LUT_10BIT_MASK 0x03ff > > @@ -166,6 +167,8 @@ void mtk_dither_set_common(void __iomem *regs, > > struct cmdq_client_reg *cmdq_reg, > > DITHER_ADD_LSHIFT_G(MTK_MAX_BPC - bpc), > > cmdq_reg, regs, DISP_DITHER_16); > > mtk_ddp_write(cmdq_pkt, dither_en, cmdq_reg, regs, cfg); > > + } else { > > + mtk_ddp_write(cmdq_pkt, DITHER_RELAY_MODE, cmdq_reg, regs, cfg); > > } > > } > > > > @@ -315,8 +318,12 @@ static void mtk_dither_config(struct device *dev, > > unsigned int w, > > { > > struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev); > > > > - mtk_ddp_write(cmdq_pkt, h << 16 | w, &priv->cmdq_reg, > > priv->regs, DISP_DITHER_SIZE); > > - mtk_ddp_write(cmdq_pkt, DITHER_RELAY_MODE, &priv->cmdq_reg, > > priv->regs, DISP_DITHER_CFG); > > + mtk_ddp_write(cmdq_pkt, h << 16 | w, &priv->cmdq_reg, priv->regs, > > + DISP_DITHER_SIZE); > > + mtk_ddp_write(cmdq_pkt, DITHER_RELAY_MODE, &priv->cmdq_reg, priv->regs, > > + DISP_DITHER_CFG); > > + mtk_dither_set_common(priv->regs, &priv->cmdq_reg, bpc, DISP_DITHER_CFG, > > + DITHER_ENGINE_EN, cmdq_pkt); > > } > > > > So now, not only bpc==5 or 6, but all valid bpc, dither config will > > call mtk_dither_set_common() with the flag DITHER_ENGINE_EN(BIT(1)). > > od config will call mtk_dither_set_common() with the flag > > DISP_DITHERING(BIT(2)). > > Additionally for 8173, gamma config will call mtk_dither_set_common() > > with the flag DISP_DITHERING (BIT(2)) > > > > For invalid mode all of them will be DITHER_RELAY_MODE. > > > > Just to make sure that this follows the spec? thanks > > > > for mt8173 gamma, there is no relay mode, only dither enable or not(bit > 2). > for mt8183 dither, there is dither enable bit 1, and relay mode bit 0 > CK suggested to set relay mode for invalid cases. Or should I just set invalid case in mtk_dither_config()? So that invalid case for gamma and od would remain its default mode? Besides that, the major difference of this patch and original version is that not only bpc ==5 or 6 will set dither enable bit 1. Does this looks good to you? > > > > > > > > > - mtk_ddp_write(cmdq_pkt, h << 16 | w, &priv->cmdq_reg, priv->regs, DISP_DITHER_SIZE); > > > > - mtk_ddp_write(cmdq_pkt, DITHER_RELAY_MODE, &priv->cmdq_reg, priv->regs, DISP_DITHER_CFG); > > > > + if (enable) { > > > > + mtk_dither_set_common(priv->regs, &priv->cmdq_reg, bpc, > > > > + DISP_DITHER_CFG, DITHER_ENGINE_EN, > > > > + cmdq_pkt); > > > > + } else { > > > > + mtk_ddp_write(cmdq_pkt, DITHER_RELAY_MODE, &priv->cmdq_reg, > > > > + priv->regs, DISP_DITHER_CFG); > > > > + } > > > > + > > > > + mtk_ddp_write(cmdq_pkt, h << 16 | w, &priv->cmdq_reg, priv->regs, > > > > + DISP_DITHER_SIZE); > > > > } > > > > > > > > static void mtk_dither_start(struct device *dev) > > > > _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel