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[209.132.180.67]) by mx.google.com with ESMTP id i5-v6si8697488pgg.84.2018.08.09.23.41.09; Thu, 09 Aug 2018 23:41:24 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727408AbeHJJIg (ORCPT + 99 others); Fri, 10 Aug 2018 05:08:36 -0400 Received: from smtp01.smtpout.orange.fr ([80.12.242.123]:46333 "EHLO smtp.smtpout.orange.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726961AbeHJJIg (ORCPT ); Fri, 10 Aug 2018 05:08:36 -0400 Received: from mail-qk0-f181.google.com ([209.85.220.181]) by mwinf5d48 with ME id MJg41y00E3vRYD503Jg5ms; Fri, 10 Aug 2018 08:40:06 +0200 X-ME-Helo: mail-qk0-f181.google.com X-ME-Auth: bWF4aS5qb3VyZGFuQHdhbmFkb28uZnI= X-ME-Date: Fri, 10 Aug 2018 08:40:06 +0200 X-ME-IP: 209.85.220.181 Received: by mail-qk0-f181.google.com with SMTP id b5-v6so5729443qkg.6 for ; Thu, 09 Aug 2018 23:40:05 -0700 (PDT) X-Gm-Message-State: AOUpUlEV5nMH7KHlRe2QJGmS5VJIMY0XJLRuZJpi9OwkC+d2w6TXlfpW 0fQrCAEp8nu5N28AHILKmstPsQ7NTg/d8TPihl8= X-Received: by 2002:ae9:ef42:: with SMTP id d63-v6mr4509438qkg.99.1533883204140; Thu, 09 Aug 2018 23:40:04 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:aed:278a:0:0:0:0:0 with HTTP; Thu, 9 Aug 2018 23:40:03 -0700 (PDT) In-Reply-To: References: <20180807220011.24436-1-maxi.jourdan@wanadoo.fr> <20180807220011.24436-2-maxi.jourdan@wanadoo.fr> From: Maxime Jourdan Date: Fri, 10 Aug 2018 08:40:03 +0200 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v2 1/4] soc: amlogic: add meson-canvas driver To: Neil Armstrong , Jerome Brunet Cc: Maxime Jourdan , Kevin Hilman , linux-amlogic , Linux Kernel Mailing List , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2018-08-08 17:10 GMT+02:00 Neil Armstrong : > On 08/08/2018 09:45, Jerome Brunet wrote: >> On Wed, 2018-08-08 at 00:00 +0200, Maxime Jourdan wrote: >>> Amlogic SoCs have a repository of 256 canvas which they use to >>> describe pixel buffers. >>> >>> They contain metadata like width, height, block mode, endianness [..] >>> >>> Many IPs within those SoCs like vdec/vpu rely on those canvas to read/write >>> pixels. >>> >>> Signed-off-by: Maxime Jourdan >>> Tested-by: Neil Armstrong >> >> Thanks for making the changes Martin, I do prefer this version. You did not have >> to drop the ops, until it is really needed because of some SoC quirks, I guess >> it is simpler this way >> >> With some answers to the nitpicks below, feel free to add : >> >> Reviewed-by: Jerome Brunet >> >>> --- >>> drivers/soc/amlogic/Kconfig | 7 + >>> drivers/soc/amlogic/Makefile | 1 + >>> drivers/soc/amlogic/meson-canvas.c | 185 +++++++++++++++++++++++ >>> include/linux/soc/amlogic/meson-canvas.h | 65 ++++++++ >>> 4 files changed, 258 insertions(+) >>> create mode 100644 drivers/soc/amlogic/meson-canvas.c >>> create mode 100644 include/linux/soc/amlogic/meson-canvas.h >>> >>> diff --git a/drivers/soc/amlogic/Kconfig b/drivers/soc/amlogic/Kconfig >>> index b04f6e4aedbc..2f282b472912 100644 >>> --- a/drivers/soc/amlogic/Kconfig >>> +++ b/drivers/soc/amlogic/Kconfig >>> @@ -1,5 +1,12 @@ >>> menu "Amlogic SoC drivers" >>> >>> +config MESON_CANVAS >>> + tristate "Amlogic Meson Canvas driver" >>> + depends on ARCH_MESON || COMPILE_TEST >>> + default n >>> + help >>> + Say yes to support the canvas IP for Amlogic SoCs. >>> + >>> config MESON_GX_SOCINFO >>> bool "Amlogic Meson GX SoC Information driver" >>> depends on ARCH_MESON || COMPILE_TEST >>> diff --git a/drivers/soc/amlogic/Makefile b/drivers/soc/amlogic/Makefile >>> index 8fa321893928..0ab16d35ac36 100644 >>> --- a/drivers/soc/amlogic/Makefile >>> +++ b/drivers/soc/amlogic/Makefile >>> @@ -1,3 +1,4 @@ >>> +obj-$(CONFIG_MESON_CANVAS) += meson-canvas.o >>> obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o >>> obj-$(CONFIG_MESON_GX_PM_DOMAINS) += meson-gx-pwrc-vpu.o >>> obj-$(CONFIG_MESON_MX_SOCINFO) += meson-mx-socinfo.o >>> diff --git a/drivers/soc/amlogic/meson-canvas.c b/drivers/soc/amlogic/meson-canvas.c >>> new file mode 100644 >>> index 000000000000..c461334b36d4 >>> --- /dev/null >>> +++ b/drivers/soc/amlogic/meson-canvas.c >>> @@ -0,0 +1,185 @@ >>> +// SPDX-License-Identifier: GPL-2.0+ >>> +/* >>> + * Copyright (C) 2018 Maxime Jourdan >>> + * Copyright (C) 2016 BayLibre, SAS >>> + * Author: Neil Armstrong >>> + * Copyright (C) 2015 Amlogic, Inc. All rights reserved. >>> + * Copyright (C) 2014 Endless Mobile >>> + */ >>> + >>> +#include >>> +#include >>> +#include >>> +#include >>> +#include >>> +#include >>> +#include >>> +#include >>> + >>> +#define NUM_CANVAS 256 >>> + >>> +/* DMC Registers */ >>> +#define DMC_CAV_LUT_DATAL 0x48 /* 0x12 offset in data sheet */ >>> + #define CANVAS_WIDTH_LBIT 29 >>> + #define CANVAS_WIDTH_LWID 3 >>> +#define DMC_CAV_LUT_DATAH 0x4c /* 0x13 offset in data sheet */ >>> + #define CANVAS_WIDTH_HBIT 0 >>> + #define CANVAS_HEIGHT_BIT 9 >>> + #define CANVAS_BLKMODE_BIT 24 >>> +#define DMC_CAV_LUT_ADDR 0x50 /* 0x14 offset in data sheet */ >>> + #define CANVAS_LUT_WR_EN (0x2 << 8) >>> + #define CANVAS_LUT_RD_EN (0x1 << 8) >>> + >>> +struct meson_canvas { >>> + struct device *dev; >>> + struct regmap *regmap_dmc; >>> + spinlock_t lock; /* canvas device lock */ >>> + u8 used[NUM_CANVAS]; >>> +}; >>> + >>> +struct meson_canvas *meson_canvas_get(struct device *dev) >>> +{ >>> + struct device_node *canvas_node; >>> + struct platform_device *canvas_pdev; >>> + struct meson_canvas *canvas; >>> + >>> + canvas_node = of_parse_phandle(dev->of_node, "amlogic,canvas", 0); >>> + if (!canvas_node) >>> + return ERR_PTR(-ENODEV); >>> + >>> + canvas_pdev = of_find_device_by_node(canvas_node); >>> + if (!canvas_pdev) { >>> + dev_err(dev, "Unable to find canvas pdev\n"); >>> + return ERR_PTR(-ENODEV); >>> + } > > I should be -EPROBE_DEFER here since the canvas driver maybe hasn't probed yet. Ack. >>> + >>> + canvas = dev_get_drvdata(&canvas_pdev->dev); >>> + if (!canvas) >>> + return ERR_PTR(-ENODEV); >> >> You've got your device at this point, maybe EINVAL instead ? > > This shouldn't fail here... I'm not sure what should be the error. I wasn't sure if it was possible to retrieve the pdev with a failed probe. Should I just assume canvas will never be NULL here then ? >> >>> + >>> + return canvas; >>> +} >>> +EXPORT_SYMBOL_GPL(meson_canvas_get); >>> + >>> +int meson_canvas_setup(struct meson_canvas *canvas, u8 canvas_index, >>> + u32 addr, u32 stride, u32 height, >>> + unsigned int wrap, >>> + unsigned int blkmode, >>> + unsigned int endian) >>> +{ >>> + struct regmap *regmap = canvas->regmap_dmc; >>> + unsigned long flags; >>> + u32 val; >>> + >>> + spin_lock_irqsave(&canvas->lock, flags); >>> + if (!canvas->used[canvas_index]) { >>> + dev_err(canvas->dev, >>> + "Trying to setup non allocated canvas %u\n", >>> + canvas_index); >>> + spin_unlock_irqrestore(&canvas->lock, flags); >>> + return -EINVAL; >>> + } >>> + >>> + regmap_write(regmap, DMC_CAV_LUT_DATAL, >>> + ((addr + 7) >> 3) | >>> + (((stride + 7) >> 3) << CANVAS_WIDTH_LBIT)); >>> + >>> + regmap_write(regmap, DMC_CAV_LUT_DATAH, >>> + ((((stride + 7) >> 3) >> CANVAS_WIDTH_LWID) << >>> + CANVAS_WIDTH_HBIT) | >>> + (height << CANVAS_HEIGHT_BIT) | >>> + (wrap << 22) | >>> + (blkmode << CANVAS_BLKMODE_BIT) | >>> + (endian << 26)); >>> + >>> + regmap_write(regmap, DMC_CAV_LUT_ADDR, >>> + CANVAS_LUT_WR_EN | canvas_index); >>> + >>> + /* Force a read-back to make sure everything is flushed. */ >>> + regmap_read(regmap, DMC_CAV_LUT_DATAH, &val); >> >> I suppose this something you got from the vendor kernel ? Out of curiosity, have >> you tried w/o it ? I am wondering if this is really necessary ? > > > It's explicit in the Amlogic source, you need a readback to make sure it's taken in account. > >> >> >>> + spin_unlock_irqrestore(&canvas->lock, flags); >>> + >>> + return 0; >>> +} >>> +EXPORT_SYMBOL_GPL(meson_canvas_setup); >>> + >>> +int meson_canvas_alloc(struct meson_canvas *canvas, u8 *canvas_index) >>> +{ >>> + int i; >>> + unsigned long flags; >>> + >>> + spin_lock_irqsave(&canvas->lock, flags); >>> + for (i = 0; i < NUM_CANVAS; ++i) { >>> + if (!canvas->used[i]) { >>> + canvas->used[i] = 1; >>> + spin_unlock_irqrestore(&canvas->lock, flags); >>> + *canvas_index = i; >>> + return 0; >>> + } >>> + } >>> + spin_unlock_irqrestore(&canvas->lock, flags); >>> + >>> + dev_err(canvas->dev, "No more canvas available\n"); >>> + return -ENODEV; >>> +} >>> +EXPORT_SYMBOL_GPL(meson_canvas_alloc); >>> + >>> +int meson_canvas_free(struct meson_canvas *canvas, u8 canvas_index) >>> +{ >>> + unsigned long flags; >>> + >>> + spin_lock_irqsave(&canvas->lock, flags); >>> + if (!canvas->used[canvas_index]) { >>> + dev_err(canvas->dev, >>> + "Trying to free unused canvas %u\n", canvas_index); >>> + spin_unlock_irqrestore(&canvas->lock, flags); >>> + return -EINVAL; >>> + } >>> + canvas->used[canvas_index] = 0; >>> + spin_unlock_irqrestore(&canvas->lock, flags); >>> + >>> + return 0; >>> +} >>> +EXPORT_SYMBOL_GPL(meson_canvas_free); >>> + >>> +static int meson_canvas_probe(struct platform_device *pdev) >>> +{ >>> + struct device *dev = &pdev->dev; >>> + struct meson_canvas *canvas; >>> + >>> + canvas = devm_kzalloc(dev, sizeof(*canvas), GFP_KERNEL); >>> + if (!canvas) >>> + return -ENOMEM; >>> + >>> + canvas->regmap_dmc = >>> + syscon_node_to_regmap(of_get_parent(dev->of_node)); >>> + if (IS_ERR(canvas->regmap_dmc)) { >>> + dev_err(dev, "failed to get DMC regmap\n"); >>> + return PTR_ERR(canvas->regmap_dmc); >>> + } >>> + >>> + canvas->dev = dev; >>> + spin_lock_init(&canvas->lock); >>> + dev_set_drvdata(dev, canvas); >>> + >>> + return 0; >>> +} >>> + >>> +static const struct of_device_id canvas_dt_match[] = { >>> + { .compatible = "amlogic,canvas" }, >>> + {} >>> +}; >>> +MODULE_DEVICE_TABLE(of, canvas_dt_match); >>> + >>> +static struct platform_driver meson_canvas_driver = { >>> + .probe = meson_canvas_probe, >>> + .driver = { >>> + .name = "amlogic-canvas", >>> + .of_match_table = canvas_dt_match, >>> + }, >>> +}; >>> +module_platform_driver(meson_canvas_driver); >>> + >>> +MODULE_DESCRIPTION("Amlogic Canvas driver"); >>> +MODULE_AUTHOR("Maxime Jourdan "); >>> +MODULE_LICENSE("GPL"); >>> diff --git a/include/linux/soc/amlogic/meson-canvas.h b/include/linux/soc/amlogic/meson-canvas.h >>> new file mode 100644 >>> index 000000000000..c164202d8e39 >>> --- /dev/null >>> +++ b/include/linux/soc/amlogic/meson-canvas.h >>> @@ -0,0 +1,65 @@ >>> +/* SPDX-License-Identifier: GPL-2.0+ */ >>> +/* >>> + * Copyright (C) 2018 Maxime Jourdan >>> + */ >>> +#ifndef MESON_CANVAS_H >>> +#define MESON_CANVAS_H >>> + >>> +#include >>> + >>> +#define MESON_CANVAS_WRAP_NONE 0x00 >>> +#define MESON_CANVAS_WRAP_X 0x01 >>> +#define MESON_CANVAS_WRAP_Y 0x02 >>> + >>> +#define MESON_CANVAS_BLKMODE_LINEAR 0x00 >>> +#define MESON_CANVAS_BLKMODE_32x32 0x01 >>> +#define MESON_CANVAS_BLKMODE_64x64 0x02 >>> + >>> +#define MESON_CANVAS_ENDIAN_SWAP16 0x1 >>> +#define MESON_CANVAS_ENDIAN_SWAP32 0x3 >>> +#define MESON_CANVAS_ENDIAN_SWAP64 0x7 >>> +#define MESON_CANVAS_ENDIAN_SWAP128 0xf >>> + >>> +struct meson_canvas; >>> + >>> +/** >>> + * meson_canvas_get() - get a canvas provider instance >>> + * >>> + * @dev: your device >> >> s/your device/consumer device pointer ? >> Ack. >>> + */ >>> +struct meson_canvas *meson_canvas_get(struct device *dev); >>> + >>> +/** >>> + * meson_canvas_alloc() - take ownership of a canvas >>> + * >>> + * @canvas: canvas provider instance retrieved from meson_canvas_get() >>> + * @canvas_index: will be filled with the canvas ID >>> + */ >>> +int meson_canvas_alloc(struct meson_canvas *canvas, u8 *canvas_index); >>> + >>> +/** >>> + * meson_canvas_free() - remove ownership from a canvas >>> + * >>> + * @canvas: canvas provider instance retrieved from meson_canvas_get() >>> + * @canvas_index: canvas ID that was obtained via meson_canvas_alloc() >>> + */ >>> +int meson_canvas_free(struct meson_canvas *canvas, u8 canvas_index); >>> + >>> +/** >>> + * meson_canvas_setup() - configure a canvas >>> + * >>> + * @canvas: canvas provider instance retrieved from meson_canvas_get() >>> + * @canvas_index: canvas ID that was obtained via meson_canvas_alloc() >>> + * @addr: physical address to the pixel buffer >>> + * @stride: width of the buffer >>> + * @height: height of the buffer >>> + * @wrap: undocumented >>> + * @blkmode: block mode (linear, 32x32, 64x64) >>> + * @endian: byte swapping (swap16, swap32, swap64, swap128) >>> + */ >>> +int meson_canvas_setup(struct meson_canvas *canvas, u8 canvas_index, >>> + u32 addr, u32 stride, u32 height, >>> + unsigned int wrap, unsigned int blkmode, >>> + unsigned int endian); >>> + >>> +#endif >> >> > > > _______________________________________________ > linux-amlogic mailing list > linux-amlogic@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-amlogic Maxime