From mboxrd@z Thu Jan 1 00:00:00 1970 From: CK Hu Subject: Re: [v2 1/1] drm/mediatek: add mt8183 dpi support Date: Tue, 19 Feb 2019 12:43:57 +0800 Message-ID: <1550551437.9232.4.camel@mtksdaap41> References: <20190219030645.68321-1-jitao.shi@mediatek.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20190219030645.68321-1-jitao.shi@mediatek.com> Sender: linux-kernel-owner@vger.kernel.org To: Jitao Shi Cc: Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , linux-pwm@vger.kernel.org, David Airlie , Matthias Brugger , Thierry Reding , Ajay Kumar , Inki Dae , Rahul Sharma , Sean Paul , Vincent Palatin , Andy Yan , Philipp Zabel , Russell King , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel List-Id: devicetree@vger.kernel.org Hi, Jitao: On Tue, 2019-02-19 at 11:06 +0800, Jitao Shi wrote: > MT8183 samples on rising and falling edge. It can reduce half data > io. > MT8173 also has those registers. But the hw function is removed. > So MT8173 doesn't support DPI dual edge sample and can't use the > same setting to mt8183. > > Signed-off-by: Jitao Shi > --- > drivers/gpu/drm/mediatek/mtk_dpi.c | 29 +++++++++++++++++++++++++++++ > 1 file changed, 29 insertions(+) > > diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c > index 62a9d47df948..610c23334047 100644 > --- a/drivers/gpu/drm/mediatek/mtk_dpi.c > +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c > @@ -117,6 +117,7 @@ struct mtk_dpi_conf { > unsigned int (*cal_factor)(int clock); > u32 reg_h_fre_con; > bool edge_sel_en; > + bool dual_edge; > }; > > static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask) > @@ -353,6 +354,13 @@ static void mtk_dpi_config_disable_edge(struct mtk_dpi *dpi) > mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, 0, EDGE_SEL_EN); > } > > +static void mtk_dpi_enable_dual_edge(struct mtk_dpi *dpi) > +{ > + mtk_dpi_mask(dpi, DPI_DDR_SETTING, DDR_EN | DDR_4PHASE, > + DDR_EN | DDR_4PHASE); > + mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, EDGE_SEL, EDGE_SEL); > +} I would like to move dual edge function to an independent patch. Maybe some other SoC need dual edge function but it's not mt8183 so it could cherry-pick the dual edge part only. > + > static void mtk_dpi_config_color_format(struct mtk_dpi *dpi, > enum mtk_dpi_out_color_format format) > { > @@ -509,6 +517,8 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi, > mtk_dpi_config_color_format(dpi, dpi->color_format); > mtk_dpi_config_2n_h_fre(dpi); > mtk_dpi_config_disable_edge(dpi); > + if (dpi->conf->dual_edge) > + mtk_dpi_enable_dual_edge(dpi); > mtk_dpi_sw_reset(dpi, false); > > return 0; > @@ -671,6 +681,16 @@ static unsigned int mt2701_calculate_factor(int clock) > return 2; > } > > +static unsigned int mt8183_calculate_factor(int clock) > +{ > + if (clock <= 27000) > + return 8; > + else if (clock <= 167000) > + return 4; > + else > + return 2; > +} > + > static const struct mtk_dpi_conf mt8173_conf = { > .cal_factor = mt8173_calculate_factor, > .reg_h_fre_con = 0xe0, > @@ -682,6 +702,12 @@ static const struct mtk_dpi_conf mt2701_conf = { > .edge_sel_en = true, > }; > > +static const struct mtk_dpi_conf mt8183_conf = { > + .cal_factor = mt8183_calculate_factor, > + .reg_h_fre_con = 0xe0, > + .dual_edge = true, > +}; > + > static int mtk_dpi_probe(struct platform_device *pdev) > { > struct device *dev = &pdev->dev; > @@ -777,6 +803,9 @@ static const struct of_device_id mtk_dpi_of_ids[] = { > { .compatible = "mediatek,mt8173-dpi", > .data = &mt8173_conf, > }, > + { .compatible = "mediatek,mt8183-dpi", I could not find "mediatek,mt8183-dpi" in binding document, please add it. Regards, CK > + .data = &mt8183_conf, > + }, > { }, > }; >