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Wed, 27 Jan 2021 23:42:54 -0800 Received: from MTKMBS31N2.mediatek.inc (172.27.4.87) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 27 Jan 2021 23:42:53 -0800 Received: from mtkcas10.mediatek.inc (172.21.101.39) by MTKMBS31N2.mediatek.inc (172.27.4.87) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 28 Jan 2021 15:42:46 +0800 Received: from [172.21.77.4] (172.21.77.4) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 28 Jan 2021 15:42:46 +0800 Message-ID: <1611819766.16091.4.camel@mtksdaap41> Subject: Re: [PATCH v11 7/9] drm/mediatek: enable dither function From: CK Hu To: Hsin-Yi Wang Date: Thu, 28 Jan 2021 15:42:46 +0800 In-Reply-To: <20210128072802.830971-8-hsinyi@chromium.org> References: <20210128072802.830971-1-hsinyi@chromium.org> <20210128072802.830971-8-hsinyi@chromium.org> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: 8A70314F22D8F0A6B6BFCADD8C97819AA697AC672BFA54AF2FF1F0D0FF62D6932000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210128_024259_492434_A23D1D0F X-CRM114-Status: GOOD ( 22.75 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Philipp Zabel , David Airlie , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Yongqiang Niu , linux-mediatek@lists.infradead.org, Daniel Vetter , Matthias Brugger , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, Hsin-Yi: On Thu, 2021-01-28 at 15:28 +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 | 44 ++++++++++++++++++++- > 1 file changed, 43 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > index 8173f709272be..e85625704d611 100644 > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > @@ -53,7 +53,9 @@ > #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 DITHER_REG(idx) (0x100 + (idx) * 4) > > #define LUT_10BIT_MASK 0x03ff > > @@ -313,8 +315,48 @@ static void mtk_dither_config(struct device *dev, unsigned int w, > { > struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev); > > + bool enable = false; > + > + /* default value for dither reg 5 to 14 */ > + const u32 dither_setting[] = { > + 0x00000000, /* 5 */ > + 0x00003002, /* 6 */ > + 0x00000000, /* 7 */ > + 0x00000000, /* 8 */ > + 0x00000000, /* 9 */ > + 0x00000000, /* 10 */ > + 0x00000000, /* 11 */ > + 0x00000011, /* 12 */ > + 0x00000000, /* 13 */ > + 0x00000000, /* 14 */ Could you explain what is this? > + }; > + > + if (bpc == 5 || bpc == 6) { > + enable = true; > + mtk_ddp_write(cmdq_pkt, > + DITHER_LSB_ERR_SHIFT_R(MTK_MAX_BPC - bpc) | > + DITHER_ADD_LSHIFT_R(MTK_MAX_BPC - bpc) | > + DITHER_NEW_BIT_MODE, > + &priv->cmdq_reg, priv->regs, DITHER_REG(15)); > + mtk_ddp_write(cmdq_pkt, > + DITHER_LSB_ERR_SHIFT_B(MTK_MAX_BPC - bpc) | > + DITHER_ADD_LSHIFT_B(MTK_MAX_BPC - bpc) | > + DITHER_LSB_ERR_SHIFT_G(MTK_MAX_BPC - bpc) | > + DITHER_ADD_LSHIFT_G(MTK_MAX_BPC - bpc), This result in 0x50505050, but previous version is 0x50504040, so this version is correct and previous version is incorrect? Regards, CK > + &priv->cmdq_reg, priv->regs, DITHER_REG(16)); > + } > + > + > + if (enable) { > + u32 idx; > + > + for (idx = 0; idx < ARRAY_SIZE(dither_setting); idx++) > + mtk_ddp_write(cmdq_pkt, dither_setting[idx], &priv->cmdq_reg, priv->regs, > + DITHER_REG(idx + 5)); > + } > + > 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, enable ? DITHER_ENGINE_EN : DITHER_RELAY_MODE, &priv->cmdq_reg, priv->regs, DISP_DITHER_CFG); > } > > static void mtk_dither_start(struct device *dev) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel