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Mon, 24 Feb 2020 22:46:50 -0800 Received: from MTKMBS33DR.mediatek.inc (172.27.6.106) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Mon, 24 Feb 2020 22:46:48 -0800 Received: from MTKCAS36.mediatek.inc (172.27.4.186) by MTKMBS33DR.mediatek.inc (172.27.6.106) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Tue, 25 Feb 2020 14:42:52 +0800 Received: from mszsdclx1018.gcn.mediatek.inc (10.16.6.18) by MTKCAS36.mediatek.inc (172.27.4.170) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Tue, 25 Feb 2020 14:45:27 +0800 From: Jitao Shi To: Rob Herring , Mark Rutland , Matthias Brugger , Daniel Vetter , David Airlie , , Subject: [PATCH v7 2/4] drm/mediatek: dpi sample mode support Date: Tue, 25 Feb 2020 14:46:36 +0800 Message-ID: <20200225064638.112282-3-jitao.shi@mediatek.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200225064638.112282-1-jitao.shi@mediatek.com> References: <20200225064638.112282-1-jitao.shi@mediatek.com> MIME-Version: 1.0 X-TM-SNTS-SMTP: F530CDD1AE990674843909EBD598AE1A7B6D596DFB8696F3C5AA950F8906ABF92000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200224_224656_905118_5E8D74EE X-CRM114-Status: GOOD ( 11.02 ) 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: devicetree@vger.kernel.org, Jitao Shi , srv_heupstream@mediatek.com, huijuan.xie@mediatek.com, stonea168@163.com, cawa.cheng@mediatek.com, linux-mediatek@lists.infradead.org, bibby.hsieh@mediatek.com, ck.hu@mediatek.com, yingjoe.chen@mediatek.com, eddie.huang@mediatek.com, 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+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DPI can sample on falling, rising or both edge. When DPI sample the data both rising and falling edge. It can reduce half data io pins. Signed-off-by: Jitao Shi --- drivers/gpu/drm/mediatek/mtk_dpi.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c index 01fa8b8d763d..08299042dda7 100644 --- a/drivers/gpu/drm/mediatek/mtk_dpi.c +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c @@ -75,6 +75,7 @@ struct mtk_dpi { enum mtk_dpi_out_bit_num bit_num; enum mtk_dpi_out_channel_swap channel_swap; int refcount; + u32 pclk_sample; }; static inline struct mtk_dpi *mtk_dpi_from_encoder(struct drm_encoder *e) @@ -348,6 +349,13 @@ 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_pclk_sample_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); +} + static void mtk_dpi_config_color_format(struct mtk_dpi *dpi, enum mtk_dpi_out_color_format format) { @@ -439,7 +447,8 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi, pll_rate = clk_get_rate(dpi->tvd_clk); vm.pixelclock = pll_rate / factor; - clk_set_rate(dpi->pixel_clk, vm.pixelclock); + clk_set_rate(dpi->pixel_clk, + vm.pixelclock * (dpi->pclk_sample > 1 ? 2 : 1)); vm.pixelclock = clk_get_rate(dpi->pixel_clk); dev_dbg(dpi->dev, "Got PLL %lu Hz, pixel clock %lu Hz\n", @@ -450,7 +459,8 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi, limit.y_bottom = 0x0010; limit.y_top = 0x0FE0; - dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING; + dpi_pol.ck_pol = dpi->pclk_sample == 1 ? + MTK_DPI_POLARITY_RISING : MTK_DPI_POLARITY_FALLING; dpi_pol.de_pol = MTK_DPI_POLARITY_RISING; dpi_pol.hsync_pol = vm.flags & DISPLAY_FLAGS_HSYNC_HIGH ? MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING; @@ -504,6 +514,8 @@ 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->pclk_sample > 1) + mtk_dpi_enable_pclk_sample_dual_edge(dpi); mtk_dpi_sw_reset(dpi, false); return 0; @@ -689,6 +701,8 @@ static int mtk_dpi_probe(struct platform_device *pdev) dpi->dev = dev; dpi->conf = (struct mtk_dpi_conf *)of_device_get_match_data(dev); + dpi->pclk_sample = of_property_read_u32_index(dev->of_node, + "pclk-sample"); mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); dpi->regs = devm_ioremap_resource(dev, mem); -- 2.21.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel