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Thu, 28 Jan 2021 00:07:19 -0800 Received: from MTKMBS31N1.mediatek.inc (172.27.4.69) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 28 Jan 2021 00:07:18 -0800 Received: from mtkcas11.mediatek.inc (172.21.101.40) by MTKMBS31N1.mediatek.inc (172.27.4.69) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 28 Jan 2021 16:07:13 +0800 Received: from [172.21.77.4] (172.21.77.4) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 28 Jan 2021 16:07:13 +0800 Message-ID: <1611821233.18369.4.camel@mtksdaap41> Subject: Re: [PATCH v11 7/9] drm/mediatek: enable dither function From: CK Hu To: Yongqiang Niu Date: Thu, 28 Jan 2021 16:07:13 +0800 In-Reply-To: <1611820770.1947.8.camel@mhfsdcap03> References: <20210128072802.830971-1-hsinyi@chromium.org> <20210128072802.830971-8-hsinyi@chromium.org> <1611819766.16091.4.camel@mtksdaap41> <1611820770.1947.8.camel@mhfsdcap03> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: 7125373E3B05CDB4A4B87CA844441DE521C7CB8D09FF63D4F85D2EC32626AA782000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210128_030835_276273_8652CCD3 X-CRM114-Status: GOOD ( 26.38 ) 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, linux-mediatek@lists.infradead.org, Daniel Vetter , Hsin-Yi Wang , 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 On Thu, 2021-01-28 at 15:59 +0800, Yongqiang Niu wrote: > On Thu, 2021-01-28 at 15:42 +0800, CK Hu wrote: > > 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? > > this is dither 5 to dither 14 setting > this will be useless, we just need set dither 5 and dither 7 like > mtk_ddp_write(cmdq_pkt, 0, comp, DISP_DITHER_5); > mtk_ddp_write(cmdq_pkt, 0, comp, DISP_DITHER_7); > other value is same with hardware default value. > > > > > > > + }; > > > + > > > + 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? > > the new version set r g b 3 channel same, seams more reasonable > > So all the setting of DISP_DITHER_5, DISP_DITHER_7, DISP_DITHER_15, DISP_DITHER_16 is identical to mtk_dither_set(), so call mtk_dither_set() instead of duplication here. Regards, CK > > > > 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