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Received: from AM7PR04MB7046.eurprd04.prod.outlook.com (2603:10a6:20b:113::22) by PA4PR04MB7663.eurprd04.prod.outlook.com (2603:10a6:102:e9::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8026.23; Thu, 10 Oct 2024 05:22:15 +0000 Received: from AM7PR04MB7046.eurprd04.prod.outlook.com ([fe80::d1ce:ea15:6648:6f90]) by AM7PR04MB7046.eurprd04.prod.outlook.com ([fe80::d1ce:ea15:6648:6f90%4]) with mapi id 15.20.8048.017; Thu, 10 Oct 2024 05:22:15 +0000 Message-ID: Date: Thu, 10 Oct 2024 13:22:40 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] clk: imx: clk-imx8mp: Allow LDB serializer clock reconfigure parent rate To: Marek Vasut , dri-devel@lists.freedesktop.org Cc: Abel Vesa , Andrzej Hajda , David Airlie , Fabio Estevam , Isaac Scott , Jernej Skrabec , Jonas Karlman , Laurent Pinchart , Maarten Lankhorst , Maxime Ripard , Michael Turquette , Neil Armstrong , Peng Fan , Pengutronix Kernel Team , Robert Foss , Sascha Hauer , Shawn Guo , Simona Vetter , Stephen Boyd , Thomas Zimmermann , imx@lists.linux.dev, kernel@dh-electronics.com, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org References: <20241008223846.337162-1-marex@denx.de> From: Liu Ying Content-Language: en-US In-Reply-To: <20241008223846.337162-1-marex@denx.de> Content-Type: text/plain; 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These clock are usually > shared with the LCDIFv3 pixel clock and supplied by the Video PLL on > i.MX8MP, but the LDB clock run at either x7 or x14 rate of the LCDIFv3 > pixel clock. Allow the LDB to reconfigure Video PLL as needed, as that > results in accurate serializer clock. > > Signed-off-by: Marek Vasut > --- > Cc: Abel Vesa > Cc: Andrzej Hajda > Cc: David Airlie > Cc: Fabio Estevam > Cc: Isaac Scott > Cc: Jernej Skrabec > Cc: Jonas Karlman > Cc: Laurent Pinchart > Cc: Maarten Lankhorst > Cc: Maxime Ripard > Cc: Michael Turquette > Cc: Neil Armstrong > Cc: Peng Fan > Cc: Pengutronix Kernel Team > Cc: Robert Foss > Cc: Sascha Hauer > Cc: Shawn Guo > Cc: Simona Vetter > Cc: Stephen Boyd > Cc: Thomas Zimmermann > Cc: dri-devel@lists.freedesktop.org > Cc: imx@lists.linux.dev > Cc: kernel@dh-electronics.com > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-clk@vger.kernel.org > --- > drivers/clk/imx/clk-imx8mp.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/clk/imx/clk-imx8mp.c b/drivers/clk/imx/clk-imx8mp.c > index 516dbd170c8a3..2e61d340b8ab7 100644 > --- a/drivers/clk/imx/clk-imx8mp.c > +++ b/drivers/clk/imx/clk-imx8mp.c > @@ -611,7 +611,7 @@ static int imx8mp_clocks_probe(struct platform_device *pdev) > hws[IMX8MP_CLK_MEDIA_MIPI_PHY1_REF] = imx8m_clk_hw_composite("media_mipi_phy1_ref", imx8mp_media_mipi_phy1_ref_sels, ccm_base + 0xbd80); > hws[IMX8MP_CLK_MEDIA_DISP1_PIX] = imx8m_clk_hw_composite_bus_flags("media_disp1_pix", imx8mp_media_disp_pix_sels, ccm_base + 0xbe00, CLK_SET_RATE_PARENT); > hws[IMX8MP_CLK_MEDIA_CAM2_PIX] = imx8m_clk_hw_composite("media_cam2_pix", imx8mp_media_cam2_pix_sels, ccm_base + 0xbe80); > - hws[IMX8MP_CLK_MEDIA_LDB] = imx8m_clk_hw_composite("media_ldb", imx8mp_media_ldb_sels, ccm_base + 0xbf00); > + hws[IMX8MP_CLK_MEDIA_LDB] = imx8m_clk_hw_composite_bus_flags("media_ldb", imx8mp_media_ldb_sels, ccm_base + 0xbf00, CLK_SET_RATE_PARENT); This patch would cause the below in-flight LDB bridge driver patch[1] fail to do display mode validation upon display modes read from LVDS to HDMI converter IT6263's DDC I2C bus. Unsupported display modes cannot be ruled out. Note that "media_ldb" is derived from "video_pll1_out" by default as the parent is set in imx8mp.dtsi. And, the only 4 rates supported by "video_pll1" are listed in imx_pll1443x_tbl[] - 1.0395GHz, 650MHz, 594MHz and 519.75MHz. [1] https://patchwork.freedesktop.org/patch/616907/?series=139266&rev=1 > hws[IMX8MP_CLK_MEMREPAIR] = imx8m_clk_hw_composite_critical("mem_repair", imx8mp_memrepair_sels, ccm_base + 0xbf80); > hws[IMX8MP_CLK_MEDIA_MIPI_TEST_BYTE] = imx8m_clk_hw_composite("media_mipi_test_byte", imx8mp_media_mipi_test_byte_sels, ccm_base + 0xc100); > hws[IMX8MP_CLK_ECSPI3] = imx8m_clk_hw_composite("ecspi3", imx8mp_ecspi3_sels, ccm_base + 0xc180); -- Regards, Liu Ying