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[90.63.244.31]) by smtp.gmail.com with ESMTPSA id e1sm59569460wrx.90.2020.03.11.06.56.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Mar 2020 06:56:58 -0700 (PDT) Subject: Re: [PATCH v13 5/6] drm/mediatek: dpi sample mode support To: Jitao Shi , Rob Herring , Mark Rutland , Matthias Brugger , Daniel Vetter , David Airlie , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20200311071823.117899-1-jitao.shi@mediatek.com> <20200311071823.117899-6-jitao.shi@mediatek.com> From: Neil Armstrong Autocrypt: addr=narmstrong@baylibre.com; prefer-encrypt=mutual; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKE5laWwgQXJtc3Ryb25nIDxuYXJtc3Ryb25nQGJheWxpYnJlLmNvbT7CwHsEEwEKACUC GyMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheABQJXDO2CAhkBAAoJEBaat7Gkz/iubGIH/iyk RqvgB62oKOFlgOTYCMkYpm2aAOZZLf6VKHKc7DoVwuUkjHfIRXdslbrxi4pk5VKU6ZP9AKsN NtMZntB8WrBTtkAZfZbTF7850uwd3eU5cN/7N1Q6g0JQihE7w4GlIkEpQ8vwSg5W7hkx3yQ6 2YzrUZh/b7QThXbNZ7xOeSEms014QXazx8+txR7jrGF3dYxBsCkotO/8DNtZ1R+aUvRfpKg5 ZgABTC0LmAQnuUUf2PHcKFAHZo5KrdO+tyfL+LgTUXIXkK+tenkLsAJ0cagz1EZ5gntuheLD YJuzS4zN+1Asmb9kVKxhjSQOcIh6g2tw7vaYJgL/OzJtZi6JlIXOwU0EVid/pAEQAND7AFhr 5faf/EhDP9FSgYd/zgmb7JOpFPje3uw7jz9wFb28Cf0Y3CcncdElYoBNbRlesKvjQRL8mozV 9RN+IUMHdUx1akR/A4BPXNdL7StfzKWOCxZHVS+rIQ/fE3Qz/jRmT6t2ZkpplLxVBpdu95qJ YwSZjuwFXdC+A7MHtQXYi3UfCgKiflj4+/ITcKC6EF32KrmIRqamQwiRsDcUUKlAUjkCLcHL CQvNsDdm2cxdHxC32AVm3Je8VCsH7/qEPMQ+cEZk47HOR3+Ihfn1LEG5LfwsyWE8/JxsU2a1 q44LQM2lcK/0AKAL20XDd7ERH/FCBKkNVzi+svYJpyvCZCnWT0TRb72mT+XxLWNwfHTeGALE +1As4jIS72IglvbtONxc2OIid3tR5rX3k2V0iud0P7Hnz/JTdfvSpVj55ZurOl2XAXUpGbq5 XRk5CESFuLQV8oqCxgWAEgFyEapI4GwJsvfl/2Er8kLoucYO1Id4mz6N33+omPhaoXfHyLSy dxD+CzNJqN2GdavGtobdvv/2V0wukqj86iKF8toLG2/Fia3DxMaGUxqI7GMOuiGZjXPt/et/ qeOySghdQ7Sdpu6fWc8CJXV2mOV6DrSzc6ZVB4SmvdoruBHWWOR6YnMz01ShFE49pPucyU1h Av4jC62El3pdCrDOnWNFMYbbon3vABEBAAHCwn4EGAECAAkFAlYnf6QCGwICKQkQFpq3saTP +K7BXSAEGQECAAYFAlYnf6QACgkQd9zb2sjISdGToxAAkOjSfGxp0ulgHboUAtmxaU3viucV e2Hl1BVDtKSKmbIVZmEUvx9D06IijFaEzqtKD34LXD6fjl4HIyDZvwfeaZCbJbO10j3k7FJE QrBtpdVqkJxme/nYlGOVzcOiKIepNkwvnHVnuVDVPcXyj2wqtsU7VZDDX41z3X4xTQwY3SO1 9nRO+f+i4RmtJcITgregMa2PcB0LvrjJlWroI+KAKCzoTHzSTpCXMJ1U/dEqyc87bFBdc+DI k8mWkPxsccdbs4t+hH0NoE3Kal9xtAl56RCtO/KgBLAQ5M8oToJVatxAjO1SnRYVN1EaAwrR xkHdd97qw6nbg9BMcAoa2NMc0/9MeiaQfbgW6b0reIz/haHhXZ6oYSCl15Knkr4t1o3I2Bqr Mw623gdiTzotgtId8VfLB2Vsatj35OqIn5lVbi2ua6I0gkI6S7xJhqeyrfhDNgzTHdQVHB9/ 7jnM0ERXNy1Ket6aDWZWCvM59dTyu37g3VvYzGis8XzrX1oLBU/tTXqo1IFqqIAmvh7lI0Se gCrXz7UanxCwUbQBFjzGn6pooEHJYRLuVGLdBuoApl/I4dLqCZij2AGa4CFzrn9W0cwm3HCO lR43gFyz0dSkMwNUd195FrvfAz7Bjmmi19DnORKnQmlvGe/9xEEfr5zjey1N9+mt3//geDP6 clwKBkq0JggA+RTEAELzkgPYKJ3NutoStUAKZGiLOFMpHY6KpItbbHjF2ZKIU1whaRYkHpB2 uLQXOzZ0d7x60PUdhqG3VmFnzXSztA4vsnDKk7x2xw0pMSTKhMafpxaPQJf494/jGnwBHyi3 h3QGG1RjfhQ/OMTX/HKtAUB2ct3Q8/jBfF0hS5GzT6dYtj0Ci7+8LUsB2VoayhNXMnaBfh+Q pAhaFfRZWTjUFIV4MpDdFDame7PB50s73gF/pfQbjw5Wxtes/0FnqydfId95s+eej+17ldGp lMv1ok7K0H/WJSdr7UwDAHEYU++p4RRTJP6DHWXcByVlpNQ4SSAiivmWiwOt490+Ac7ATQRN WQbPAQgAvIoM384ZRFocFXPCOBir5m2J+96R2tI2XxMgMfyDXGJwFilBNs+fpttJlt2995A8 0JwPj8SFdm6FBcxygmxBBCc7i/BVQuY8aC0Z/w9Vzt3Eo561r6pSHr5JGHe8hwBQUcNPd/9l 2ynP57YTSE9XaGJK8gIuTXWo7pzIkTXfN40Wh5jeCCspj4jNsWiYhljjIbrEj300g8RUT2U0 FcEoiV7AjJWWQ5pi8lZJX6nmB0lc69Jw03V6mblgeZ/1oTZmOepkagwy2zLDXxihf0GowUif GphBDeP8elWBNK+ajl5rmpAMNRoKxpN/xR4NzBg62AjyIvigdywa1RehSTfccQARAQABwsBf BBgBAgAJBQJNWQbPAhsMAAoJEBaat7Gkz/iuteIH+wZuRDqK0ysAh+czshtG6JJlLW6eXJJR Vi7dIPpgFic2LcbkSlvB8E25Pcfz/+tW+04Urg4PxxFiTFdFCZO+prfd4Mge7/OvUcwoSub7 ZIPo8726ZF5/xXzajahoIu9/hZ4iywWPAHRvprXaim5E/vKjcTeBMJIqZtS4u/UK3EpAX59R XVxVpM8zJPbk535ELUr6I5HQXnihQm8l6rt9TNuf8p2WEDxc8bPAZHLjNyw9a/CdeB97m2Tr zR8QplXA5kogS4kLe/7/JmlDMO8Zgm9vKLHSUeesLOrjdZ59EcjldNNBszRZQgEhwaarfz46 BSwxi7g3Mu7u5kUByanqHyA= Organization: Baylibre Message-ID: <1753781a-7b99-bc1a-22e4-2df2f45a6419@baylibre.com> Date: Wed, 11 Mar 2020 14:56:57 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <20200311071823.117899-6-jitao.shi@mediatek.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200311_065700_377986_3F42E647 X-CRM114-Status: GOOD ( 21.73 ) 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, srv_heupstream@mediatek.com, huijuan.xie@mediatek.com, stonea168@163.com, cawa.cheng@mediatek.com, Boris Brezillon , linux-mediatek@lists.infradead.org, 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 On 11/03/2020 08:18, Jitao Shi wrote: > 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. > > Reviewed-by: CK Hu > Signed-off-by: Jitao Shi > --- > drivers/gpu/drm/mediatek/mtk_dpi.c | 27 +++++++++++++++++++++++++-- > 1 file changed, 25 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c > index 087f5ce732e1..2871e68e7767 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; > @@ -693,6 +705,7 @@ static const struct mtk_dpi_conf mt8183_conf = { > static int mtk_dpi_probe(struct platform_device *pdev) > { > struct device *dev = &pdev->dev; > + struct device_node *ep; > struct mtk_dpi *dpi; > struct resource *mem; > int comp_id; > @@ -705,6 +718,16 @@ static int mtk_dpi_probe(struct platform_device *pdev) > dpi->dev = dev; > dpi->conf = (struct mtk_dpi_conf *)of_device_get_match_data(dev); > > + ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0); > + if (!ep) { > + dev_err(dev, "Failed get the endpoint port\n"); > + return -EINVAL; > + } > + > + /* Get the sampling edge from the endpoint. */ > + of_property_read_u32(ep, "pclk-sample", &dpi->pclk_sample); > + of_node_put(ep); Instead of having hard-coded value in DT, you should switch to bridge bus format negotiation instead. Boris pushed support a few weeks ago and the dw-hdmi bridge has been updated to work with it and negotiate the format between the encoder and the bridge. Phong is pushing the it66121 bridge driver which is used on a MT8183 board, and should make use of that to handle the dual edge support between the 8183 dpi and the it66121 bridge. Neil > + > mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > dpi->regs = devm_ioremap_resource(dev, mem); > if (IS_ERR(dpi->regs)) { > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel