From patchwork Wed Nov 6 09:34:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manikandan Muralidharan X-Patchwork-Id: 13864347 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7024BD44D42 for ; Wed, 6 Nov 2024 10:25:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=jQeIu20MzRz4XzS62SE1VVsKP5u1apYeeQz1B3eKJi8=; b=3FCmVhNXlqkmLE7IjSI0WiM/DY gzOQlrnPuVXq2j6YpgPL2KJJfXF3NNuiES4tSFUG+l/C90RXIIaiSnMPqP2qoLPWi3aAdBRtSidXm bSOlo9yYGxPVyLHWr8fyFaiDehlRsKRRD5HyyHyLWskyzOtLZsf9So+lMkway3gdtS4PFrBfhzkpI 9kohfWSexduby0Nnuq4VWZpycWPgRhCv3xRFnWmrpIDLuHe9NDjLIAENYXiocGpmi/TfL+DVhEmU3 9q9+fHgeFw5LmSR7wsKrV9oEseeVkWE7dh9BYLFLS+yZ/yH9m134wdu8hzPDZjuTtlyXyeXq+jgEY c212s5Uw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t8dEA-00000002jr6-1BWw; Wed, 06 Nov 2024 10:25:30 +0000 Received: from esa.microchip.iphmx.com ([68.232.153.233]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t8cRs-00000002YxA-3wrp for linux-arm-kernel@lists.infradead.org; Wed, 06 Nov 2024 09:35:39 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1730885737; x=1762421737; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=EdjGUv9QhprpIhuWhKrPvJcZxio+p/FRanC4I1XYsrE=; b=qV6+BAuoQj2uujrlEY8/7wYFDLUGKmlQBuo5ysXLMsvhVmCT9DnGZJPz ihKqomBhAz7eIRDNoJ3Le9bR3xhs99LCkBmXlcVAM9XG+cId36SbPGc1m xKqFN3MiAwxdCRgYFRblZDcLoKWdKXk+4bPd8PZeHoD1y2goBfgmcgpuK em3xhoLQnravJ3nyS0s9hkwyd2eMVhetNOKHttBp4fmNqtRBAM/hS24oA xHPPk+FPUgO1XxRmRi1te12YFNc+zcur7Wjc6WTIOq479Vjrwdy96xYyj Chi+2DjdJkIEoFVn87L0rXCCkGEP3RDb1SWwqHBhIcf11mvlEPuJE571o Q==; X-CSE-ConnectionGUID: 0kVQr9qhRguhY/PD4s+80w== X-CSE-MsgGUID: WVljJGQ4RmSB24KTc+7vAQ== X-IronPort-AV: E=Sophos;i="6.11,262,1725346800"; d="scan'208";a="33940996" X-Amp-Result: SKIPPED(no attachment in message) Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa3.microchip.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 06 Nov 2024 02:35:34 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Wed, 6 Nov 2024 02:35:11 -0700 Received: from che-lt-i67131.microchip.com (10.10.85.11) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server id 15.1.2507.35 via Frontend Transport; Wed, 6 Nov 2024 02:35:03 -0700 From: Manikandan Muralidharan To: , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [PATCH v5 2/4] drm/bridge: add Microchip DSI controller support for sam9x7 SoC series Date: Wed, 6 Nov 2024 15:04:27 +0530 Message-ID: <20241106093429.157131-3-manikandan.m@microchip.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241106093429.157131-1-manikandan.m@microchip.com> References: <20241106093429.157131-1-manikandan.m@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241106_013537_050949_EB18CA6C X-CRM114-Status: GOOD ( 23.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add the Microchip's DSI controller wrapper driver that uses the Synopsys DesignWare MIPI DSI host controller bridge. Signed-off-by: Manikandan Muralidharan --- changes in v4: - Fixed issues reported by kernel test robot - replaced syscon_regmap_lookup_by_phandle with syscon_regmap_lookup_by_compatible changes in v3: - make remove callback return void changes in v2: - use static const with global variables - replace dev_err with dev_err_probe - move clk_prepare_enable to simplify the error path - use FIELD_PREP calls - remove unused macros and unused functions - rename function name with mchp_ suffix - add suspend and resume pm calls to handle pllref_clk --- drivers/gpu/drm/bridge/Kconfig | 8 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/dw-mipi-dsi-mchp.c | 545 ++++++++++++++++++++++ 3 files changed, 554 insertions(+) create mode 100644 drivers/gpu/drm/bridge/dw-mipi-dsi-mchp.c diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index 6b4664d91faa..73f6be141e86 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -209,6 +209,14 @@ config DRM_MICROCHIP_LVDS_SERIALIZER help Support for Microchip's LVDS serializer. +config DRM_MICROCHIP_DW_MIPI_DSI + tristate "Microchip specific extensions for Synopsys DW MIPI DSI" + depends on DRM_ATMEL_HLCDC + select DRM_DW_MIPI_DSI + help + This selects support for Microchip's SoC specific extensions + for the Synopsys DesignWare dsi driver. + config DRM_NWL_MIPI_DSI tristate "Northwest Logic MIPI DSI Host controller" depends on DRM diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index 97304b429a53..ee5bd77ebfe7 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o obj-$(CONFIG_DRM_MICROCHIP_LVDS_SERIALIZER) += microchip-lvds.o +obj-$(CONFIG_DRM_MICROCHIP_DW_MIPI_DSI) += dw-mipi-dsi-mchp.o obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o diff --git a/drivers/gpu/drm/bridge/dw-mipi-dsi-mchp.c b/drivers/gpu/drm/bridge/dw-mipi-dsi-mchp.c new file mode 100644 index 000000000000..804c2d8bd88a --- /dev/null +++ b/drivers/gpu/drm/bridge/dw-mipi-dsi-mchp.c @@ -0,0 +1,545 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2024 Microchip Technology Inc. and its subsidiaries + * + * Author: Manikandan Muralidharan + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DSI_PLL_REF_CLK 24000000 + +#define DSI_PWR_UP 0x04 +#define HOST_RESET BIT(0) +#define HOST_PWRUP 0 + +#define DSI_PHY_RSTZ 0xa0 +#define PHY_SHUTDOWNZ 0 + +#define DSI_PHY_TST_CTRL0 0xb4 +#define PHY_TESTCLK BIT(1) +#define PHY_UNTESTCLK 0 +#define PHY_UNTESTCLR 0 + +#define DSI_PHY_TST_CTRL1 0xb8 +#define PHY_TESTEN BIT(16) +#define PHY_UNTESTEN 0 +#define PHY_TESTDOUT_MASK GENMASK(15, 8) +#define PHY_TESTDIN_MASK GENMASK(7, 0) + +#define BYPASS_VCO_RANGE BIT(7) +#define VCO_RANGE_CON_SEL_MASK GENMASK(5, 3) +#define VCO_IN_CAP_CON_LOW BIT(1) + +#define CP_CURRENT_0 0x2 +#define CP_CURRENT_1 0x4 +#define CP_CURRENT_2 0x5 +#define CP_CURRENT_3 0x6 +#define CP_CURRENT_4 0x7 +#define CP_CURRENT_5 0x8 +#define CP_CURRENT_6 0xc +#define CP_CURRENT_SEL_MASK GENMASK(3, 0) +#define CP_PROGRAM_EN BIT(7) + +#define LPF_RESISTORS_15_6KOHM 0x1 +#define LPF_RESISTORS_14_4KOHM 0x4 +#define LPF_RESISTORS_12_8KOHM 0x8 +#define LPF_RESISTORS_11_4KOHM 0x10 +#define LPF_PROGRAM_EN BIT(6) +#define LPF_RESISTORS_SEL_MASK GENMASK(5, 0) + +#define INPUT_DIVIDER(val) (((val) - 1) & 0x7f) +#define LOW_PROGRAM_EN 0 +#define HIGH_PROGRAM_EN BIT(7) +#define LOOP_DIV_LOW_SEL(val) (((val) - 1) & 0x1f) +#define LOOP_DIV_HIGH_SEL(val) ((((val) - 1) >> 5) & 0xf) +#define PLL_LOOP_DIV_EN BIT(5) +#define PLL_INPUT_DIV_EN BIT(4) + +#define PLL_BIAS_CUR_SEL_CAP_VCO_CONTROL 0x10 +#define PLL_CP_CONTROL_PLL_LOCK_BYPASS 0x11 +#define PLL_LPF_AND_CP_CONTROL 0x12 +#define PLL_INPUT_DIVIDER_RATIO 0x17 +#define PLL_LOOP_DIVIDER_RATIO 0x18 +#define PLL_INPUT_AND_LOOP_DIVIDER_RATIOS_CONTROL 0x19 + +#define SFR_ISS_CFG 0x240 +#define ISS_CFG_DSI_MODE 1 + +struct dw_mipi_dsi_mchp_chip_data { + const struct dw_mipi_dsi_phy_ops *phy_ops; + unsigned int max_data_lanes; +}; + +struct dw_mipi_dsi_mchp { + struct device *dev; + void __iomem *base; + struct dw_mipi_dsi *dsi; + struct clk *pllref_clk; + struct dw_mipi_dsi_plat_data pdata; + + /* For PLL config */ + unsigned int lane_mbps; + u16 input_div; + u16 feedback_div; + u32 format; +}; + +struct dphy_pll_parameter_map { + unsigned int max_mbps; + u8 hsfreqrange; + u8 icpctrl; + u8 lpfctrl; +}; + +static const struct dphy_pll_parameter_map dppa_map[] = { + { 89, 0x00, CP_CURRENT_1, LPF_RESISTORS_11_4KOHM }, + { 99, 0x20, CP_CURRENT_1, LPF_RESISTORS_11_4KOHM }, + { 109, 0x40, CP_CURRENT_1, LPF_RESISTORS_11_4KOHM }, + { 129, 0x02, CP_CURRENT_5, LPF_RESISTORS_12_8KOHM }, + { 139, 0x22, CP_CURRENT_5, LPF_RESISTORS_12_8KOHM }, + { 149, 0x42, CP_CURRENT_5, LPF_RESISTORS_12_8KOHM }, + { 169, 0x04, CP_CURRENT_6, LPF_RESISTORS_12_8KOHM }, + { 179, 0x24, CP_CURRENT_6, LPF_RESISTORS_12_8KOHM }, + { 199, 0x44, CP_CURRENT_6, LPF_RESISTORS_12_8KOHM }, + { 219, 0x06, CP_CURRENT_6, LPF_RESISTORS_12_8KOHM }, + { 239, 0x26, CP_CURRENT_6, LPF_RESISTORS_12_8KOHM }, + { 249, 0x46, CP_CURRENT_6, LPF_RESISTORS_12_8KOHM }, + { 269, 0x08, CP_CURRENT_0, LPF_RESISTORS_12_8KOHM }, + { 299, 0x28, CP_CURRENT_0, LPF_RESISTORS_12_8KOHM }, + { 329, 0x0a, CP_CURRENT_2, LPF_RESISTORS_12_8KOHM }, + { 359, 0x2a, CP_CURRENT_2, LPF_RESISTORS_12_8KOHM }, + { 399, 0x4a, CP_CURRENT_2, LPF_RESISTORS_12_8KOHM }, + { 449, 0x0C, CP_CURRENT_2, LPF_RESISTORS_15_6KOHM }, + { 499, 0x2c, CP_CURRENT_2, LPF_RESISTORS_15_6KOHM }, + { 549, 0x0e, CP_CURRENT_3, LPF_RESISTORS_11_4KOHM }, + { 599, 0x2e, CP_CURRENT_3, LPF_RESISTORS_11_4KOHM }, + { 649, 0x10, CP_CURRENT_3, LPF_RESISTORS_14_4KOHM }, + { 699, 0x30, CP_CURRENT_3, LPF_RESISTORS_14_4KOHM }, + { 749, 0x12, CP_CURRENT_3, LPF_RESISTORS_14_4KOHM }, + { 799, 0x32, CP_CURRENT_3, LPF_RESISTORS_14_4KOHM }, + { 849, 0x52, CP_CURRENT_3, LPF_RESISTORS_14_4KOHM }, + { 899, 0x72, CP_CURRENT_3, LPF_RESISTORS_14_4KOHM }, + { 949, 0x14, CP_CURRENT_4, LPF_RESISTORS_11_4KOHM }, + {1000, 0x34, CP_CURRENT_4, LPF_RESISTORS_11_4KOHM } +}; + +struct hstt { + unsigned int maxfreq; + struct dw_mipi_dsi_dphy_timing timing; +}; + +#define HSTT(_maxfreq, _c_lp2hs, _c_hs2lp, _d_lp2hs, _d_hs2lp) \ +{ \ + .maxfreq = _maxfreq, \ + .timing = { \ + .clk_lp2hs = _c_lp2hs, \ + .clk_hs2lp = _c_hs2lp, \ + .data_lp2hs = _d_lp2hs, \ + .data_hs2lp = _d_hs2lp, \ + } \ +} + +static const struct hstt hstt_table[] = { + HSTT(90, 32, 20, 26, 13), + HSTT(100, 35, 23, 28, 14), + HSTT(110, 32, 22, 26, 13), + HSTT(130, 31, 20, 27, 13), + HSTT(140, 33, 22, 26, 14), + HSTT(150, 33, 21, 26, 14), + HSTT(170, 32, 20, 27, 13), + HSTT(180, 36, 23, 30, 15), + HSTT(200, 40, 22, 33, 15), + HSTT(220, 40, 22, 33, 15), + HSTT(240, 44, 24, 36, 16), + HSTT(250, 48, 24, 38, 17), + HSTT(270, 48, 24, 38, 17), + HSTT(300, 50, 27, 41, 18), + HSTT(330, 56, 28, 45, 18), + HSTT(360, 59, 28, 48, 19), + HSTT(400, 61, 30, 50, 20), + HSTT(450, 67, 31, 55, 21), + HSTT(500, 73, 31, 59, 22), + HSTT(550, 79, 36, 63, 24), + HSTT(600, 83, 37, 68, 25), + HSTT(650, 90, 38, 73, 27), + HSTT(700, 95, 40, 77, 28), + HSTT(750, 102, 40, 84, 28), + HSTT(800, 106, 42, 87, 30), + HSTT(850, 113, 44, 93, 31), + HSTT(900, 118, 47, 98, 32), + HSTT(950, 124, 47, 102, 34), + HSTT(1000, 130, 49, 107, 35), +}; + +static int mchp_max_mbps_to_parameter(unsigned int max_mbps) +{ + for (int index = 0; index < ARRAY_SIZE(dppa_map); index++) + if (dppa_map[index].max_mbps >= max_mbps) + return index; + + return -EINVAL; +} + +static inline void mchp_phy_write(struct dw_mipi_dsi_mchp *dsi, u32 reg, u32 val) +{ + writel(val, dsi->base + reg); +} + +static void dw_mipi_dsi_mchp_phy_write(struct dw_mipi_dsi_mchp *dsi, + u8 test_code, + u8 test_data) +{ + /* General DPHY control operation */ + + mchp_phy_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR); + mchp_phy_write(dsi, DSI_PHY_TST_CTRL1, PHY_TESTEN | + FIELD_PREP(PHY_TESTDOUT_MASK, 1) | + FIELD_PREP(PHY_TESTDIN_MASK, test_code)); + mchp_phy_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR); + mchp_phy_write(dsi, DSI_PHY_TST_CTRL1, PHY_UNTESTEN | + FIELD_PREP(PHY_TESTDOUT_MASK, 0) | + FIELD_PREP(PHY_TESTDIN_MASK, test_data)); + mchp_phy_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR); + mchp_phy_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLK | PHY_UNTESTCLR); +} + +static int dw_mipi_dsi_mchp_init(void *priv_data) +{ + struct dw_mipi_dsi_mchp *dsi = priv_data; + int index, vco, ret = 0; + + /* + * Get vco from frequency(lane_mbps) + * vco frequency table + * 000 - between 80 and 200 MHz + * 001 - between 200 and 300 MHz + * 010 - between 300 and 500 MHz + * 011 - between 500 and 700 MHz + * 100 - between 700 and 900 MHz + * 101 - between 900 and 1000 MHz + */ + vco = (dsi->lane_mbps < 200) ? 0 : (dsi->lane_mbps + 100) / 200; + + index = mchp_max_mbps_to_parameter(dsi->lane_mbps); + if (index < 0) { + dev_err(dsi->dev, + "failed to get parameter for %dmbps clock\n", + dsi->lane_mbps); + return index; + } + + /* D-PHY in Shutdown mode */ + mchp_phy_write(dsi, DSI_PHY_RSTZ, PHY_SHUTDOWNZ); + + dw_mipi_dsi_mchp_phy_write(dsi, PLL_BIAS_CUR_SEL_CAP_VCO_CONTROL, + BYPASS_VCO_RANGE | + FIELD_PREP(VCO_RANGE_CON_SEL_MASK, vco) | + VCO_IN_CAP_CON_LOW); + + dw_mipi_dsi_mchp_phy_write(dsi, PLL_CP_CONTROL_PLL_LOCK_BYPASS, + FIELD_PREP(CP_CURRENT_SEL_MASK, dppa_map[index].icpctrl)); + + dw_mipi_dsi_mchp_phy_write(dsi, PLL_LPF_AND_CP_CONTROL, + CP_PROGRAM_EN | LPF_PROGRAM_EN | + FIELD_PREP(LPF_RESISTORS_SEL_MASK, dppa_map[index].lpfctrl)); + + dw_mipi_dsi_mchp_phy_write(dsi, PLL_INPUT_AND_LOOP_DIVIDER_RATIOS_CONTROL, + PLL_LOOP_DIV_EN | PLL_INPUT_DIV_EN); + + dw_mipi_dsi_mchp_phy_write(dsi, PLL_INPUT_DIVIDER_RATIO, + INPUT_DIVIDER(dsi->input_div)); + + dw_mipi_dsi_mchp_phy_write(dsi, PLL_LOOP_DIVIDER_RATIO, + LOOP_DIV_LOW_SEL(dsi->feedback_div) | + LOW_PROGRAM_EN); + + dw_mipi_dsi_mchp_phy_write(dsi, PLL_LOOP_DIVIDER_RATIO, + LOOP_DIV_HIGH_SEL(dsi->feedback_div) | + HIGH_PROGRAM_EN); + + return ret; +} + +static int dw_mipi_dsi_mchp_get_lane_mbps(void *priv_data, + const struct drm_display_mode *mode, + unsigned long mode_flags, u32 lanes, + u32 format, unsigned int *lane_mbps) +{ + struct dw_mipi_dsi_mchp *dsi = priv_data; + unsigned long best_freq, fvco_min, fvco_max, fin, fout; + unsigned long min_delta = ULONG_MAX, delta; + unsigned int target_mbps = 0, mpclk, desired_mbps; + unsigned int max_mbps = dppa_map[ARRAY_SIZE(dppa_map) - 1].max_mbps; + unsigned int min_prediv, max_prediv; + unsigned int _fbdiv, best_fbdiv, _prediv, best_prediv; + int bpp; + u64 freq_factor; + + dsi->format = format; + bpp = mipi_dsi_pixel_format_to_bpp(dsi->format); + if (bpp < 0) { + dev_err(dsi->dev, + "failed to get bpp for pixel format %d\n", + dsi->format); + return bpp; + } + + mpclk = DIV_ROUND_UP(mode->clock, MSEC_PER_SEC); + if (mpclk) { + /* take 1/0.8, since mbps must be bigger than bandwidth of RGB */ + desired_mbps = mpclk * (bpp / lanes) * 10 / 8; + if (desired_mbps < max_mbps) { + target_mbps = desired_mbps; + } else { + dev_err(dsi->dev, + "DPHY clock frequency is out of range\n"); + return -ERANGE; + } + } + + fin = clk_get_rate(dsi->pllref_clk); + fout = target_mbps * USEC_PER_SEC; + + /* constraint: 5Mhz <= Fref / N <= 40MHz */ + min_prediv = DIV_ROUND_UP(fin, 40 * USEC_PER_SEC); + max_prediv = fin / (5 * USEC_PER_SEC); + + /* constraint: 80MHz <= Fvco <= 1000Mhz */ + fvco_min = 80 * USEC_PER_SEC; + fvco_max = 1000 * USEC_PER_SEC; + + for (best_freq = 0, _prediv = min_prediv; _prediv <= max_prediv; _prediv++) { + /* Fvco = Fref * M / N */ + freq_factor = fout * _prediv; + do_div(freq_factor, fin); + _fbdiv = freq_factor; + /* + * Due to the use of a "by 2 pre-scaler," the range of the + * feedback multiplication value M is limited to even division + * numbers, and m must be greater than 6, not bigger than 512. + */ + if (_fbdiv < 6 || _fbdiv > 512) + continue; + + _fbdiv += _fbdiv % 2; + + freq_factor = _fbdiv * fin; + do_div(freq_factor, _prediv); + if (freq_factor < fvco_min || freq_factor > fvco_max) + continue; + + delta = abs(fout - freq_factor); + if (delta < min_delta) { + best_prediv = _prediv; + best_fbdiv = _fbdiv; + min_delta = delta; + best_freq = freq_factor; + } + } + + if (best_freq) { + dsi->lane_mbps = DIV_ROUND_UP(best_freq, USEC_PER_SEC); + *lane_mbps = dsi->lane_mbps; + dsi->input_div = best_prediv; + dsi->feedback_div = best_fbdiv; + } else { + dev_err(dsi->dev, "Can not find best_freq for DPHY\n"); + return -EINVAL; + } + + return 0; +} + +static int dw_mipi_dsi_mchp_get_timing(void *priv_data, unsigned int lane_mbps, + struct dw_mipi_dsi_dphy_timing *timing) +{ + int index = 0; + + for (; index < ARRAY_SIZE(hstt_table); index++) + if (lane_mbps < hstt_table[index].maxfreq) + break; + + if (index == ARRAY_SIZE(hstt_table)) + index--; + + *timing = hstt_table[index].timing; + + return 0; +} + +static void dw_mipi_dsi_mchp_power_on(void *priv_data) +{ + struct dw_mipi_dsi_mchp *dsi = priv_data; + + /* Enable the DSI wrapper */ + mchp_phy_write(dsi, DSI_PWR_UP, HOST_PWRUP); +} + +static void dw_mipi_dsi_mchp_power_off(void *priv_data) +{ + struct dw_mipi_dsi_mchp *dsi = priv_data; + + /* Disable the DSI wrapper */ + mchp_phy_write(dsi, DSI_PWR_UP, HOST_RESET); +} + +static int dw_mipi_dsi_mchp_probe(struct platform_device *pdev) +{ + struct dw_mipi_dsi_mchp *dsi; + struct regmap *regmap_sfr; + const struct dw_mipi_dsi_mchp_chip_data *cdata; + int ret; + + dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL); + if (!dsi) + return -ENOMEM; + + dsi->dev = &pdev->dev; + cdata = of_device_get_match_data(dsi->dev); + + dsi->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(dsi->base)) { + ret = PTR_ERR(dsi->base); + dev_err_probe(dsi->dev, ret, "Unable to get DSI Base address\n"); + return ret; + } + + dsi->pllref_clk = devm_clk_get(&pdev->dev, "refclk"); + if (IS_ERR(dsi->pllref_clk)) { + ret = PTR_ERR(dsi->pllref_clk); + dev_err_probe(dsi->dev, ret, "Unable to get DSI PHY PLL reference clock\n"); + return ret; + } + + regmap_sfr = syscon_regmap_lookup_by_compatible("microchip,sam9x60-sfr"); + if (IS_ERR(regmap_sfr)) { + ret = PTR_ERR(regmap_sfr); + dev_err_probe(dsi->dev, ret, "Failed to lookup Special Function Register\n"); + return ret; + } + /* Select DSI in SFR's ISS Configuration Register */ + ret = regmap_write(regmap_sfr, SFR_ISS_CFG, ISS_CFG_DSI_MODE); + if (ret) { + dev_err_probe(dsi->dev, ret, "Failed to enable DSI in SFR_ISS_CFG Register\n"); + return ret; + } + + clk_set_rate(dsi->pllref_clk, DSI_PLL_REF_CLK); + if (clk_get_rate(dsi->pllref_clk) != DSI_PLL_REF_CLK) { + ret = -EINVAL; + dev_err_probe(dsi->dev, ret, "Failed to set DSI PHY PLL reference clock\n"); + return ret; + } + + ret = clk_prepare_enable(dsi->pllref_clk); + if (ret) { + dev_err_probe(dsi->dev, ret, "Failed to enable DSI PHY PLL reference clock\n"); + return ret; + } + + dsi->pdata.base = dsi->base; + dsi->pdata.max_data_lanes = cdata->max_data_lanes; + dsi->pdata.phy_ops = cdata->phy_ops; + dsi->pdata.priv_data = dsi; + platform_set_drvdata(pdev, dsi); + + /* call synopsis probe */ + dsi->dsi = dw_mipi_dsi_probe(pdev, &dsi->pdata); + if (IS_ERR(dsi->dsi)) { + ret = PTR_ERR(dsi->dsi); + dev_err_probe(dsi->dev, ret, "Failed to initialize mipi dsi host\n"); + clk_disable_unprepare(dsi->pllref_clk); + return ret; + } + + return 0; +} + +static void dw_mipi_dsi_mchp_remove(struct platform_device *pdev) +{ + struct dw_mipi_dsi_mchp *dsi = platform_get_drvdata(pdev); + + dw_mipi_dsi_remove(dsi->dsi); + clk_disable_unprepare(dsi->pllref_clk); +} + +static int dw_mipi_dsi_mchp_suspend(struct device *dev) +{ + struct dw_mipi_dsi_mchp *dsi = dev_get_drvdata(dev); + + clk_disable_unprepare(dsi->pllref_clk); + + return 0; +} + +static int dw_mipi_dsi_mchp_resume(struct device *dev) +{ + struct dw_mipi_dsi_mchp *dsi = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(dsi->pllref_clk); + if (ret) { + dev_err(dsi->dev, "Failed to enable pllref_clk: %d\n", ret); + return ret; + } + + return 0; +} + +static const struct dev_pm_ops dw_mipi_dsi_mchp_pm_ops = { + SYSTEM_SLEEP_PM_OPS(dw_mipi_dsi_mchp_suspend, + dw_mipi_dsi_mchp_resume) + RUNTIME_PM_OPS(dw_mipi_dsi_mchp_suspend, + dw_mipi_dsi_mchp_resume, NULL) +}; + +static const struct dw_mipi_dsi_phy_ops dw_mipi_dsi_mchp_phy_ops = { + .init = dw_mipi_dsi_mchp_init, + .power_on = dw_mipi_dsi_mchp_power_on, + .power_off = dw_mipi_dsi_mchp_power_off, + .get_lane_mbps = dw_mipi_dsi_mchp_get_lane_mbps, + .get_timing = dw_mipi_dsi_mchp_get_timing, +}; + +static const struct dw_mipi_dsi_mchp_chip_data sam9x75_chip_data = { + .max_data_lanes = 4, + .phy_ops = &dw_mipi_dsi_mchp_phy_ops, +}; + +static const struct of_device_id dw_mipi_dsi_mchp_dt_ids[] = { + { + .compatible = "microchip,sam9x75-mipi-dsi", + .data = &sam9x75_chip_data, + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, dw_mipi_dsi_mchp_dt_ids); + +struct platform_driver dw_mipi_dsi_mchp_driver = { + .probe = dw_mipi_dsi_mchp_probe, + .remove = dw_mipi_dsi_mchp_remove, + .driver = { + .of_match_table = dw_mipi_dsi_mchp_dt_ids, + .name = "dw-mipi-dsi-mchp", + .pm = &dw_mipi_dsi_mchp_pm_ops, + }, +}; +module_platform_driver(dw_mipi_dsi_mchp_driver); + +MODULE_AUTHOR("Manikandan Muralidharan "); +MODULE_DESCRIPTION("Microchip DW MIPI DSI controller wrapper driver"); +MODULE_LICENSE("GPL");