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SubjectRe: [PATCH v6 3/3] drm: bridge: cdns-mhdp: add j721e wrapper
Hi Yuti,

Thank you for the patch.

On Wed, Feb 26, 2020 at 11:22:59AM +0100, Yuti Amonkar wrote:
> Add j721e wrapper for mhdp, which sets up the clock and data muxes.
>
> Signed-off-by: Yuti Amonkar <yamonkar@cadence.com>
> Signed-off-by: Jyri Sarha <jsarha@ti.com>
> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
> ---
> drivers/gpu/drm/bridge/Kconfig | 12 ++++
> drivers/gpu/drm/bridge/Makefile | 4 ++
> drivers/gpu/drm/bridge/cdns-mhdp-core.c | 14 +++++
> drivers/gpu/drm/bridge/cdns-mhdp-core.h | 1 +
> drivers/gpu/drm/bridge/cdns-mhdp-j721e.c | 79 ++++++++++++++++++++++++
> drivers/gpu/drm/bridge/cdns-mhdp-j721e.h | 55 +++++++++++++++++
> 6 files changed, 165 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/cdns-mhdp-j721e.c
> create mode 100644 drivers/gpu/drm/bridge/cdns-mhdp-j721e.h
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 3bfabb76f2bb..ba945071bb0b 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -38,6 +38,18 @@ config DRM_CDNS_MHDP
> It takes a DPI stream as input and output it encoded
> in DP format.
>
> +if DRM_CDNS_MHDP
> +
> +config DRM_CDNS_MHDP_J721E
> + bool "J721E Cadence DPI/DP wrapper support"
> + default y

Should this be automatically selected when support for the J721E
platform is enabled, instead of being user-selectable ?

> + help
> + Support J721E Cadence DPI/DP wrapper. This is a wrapper
> + which adds support for J721E related platform ops. It
> + initializes the J721e Display Port and sets up the
> + clock and data muxes.
> +endif
> +
> config DRM_DUMB_VGA_DAC
> tristate "Dumb VGA DAC Bridge support"
> depends on OF
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index 2e2c5be7c714..fa575ad57b95 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -19,5 +19,9 @@ obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
> obj-$(CONFIG_DRM_CDNS_MHDP) += cdns-mhdp.o
> cdns-mhdp-objs := cdns-mhdp-core.o
>
> +ifeq ($(CONFIG_DRM_CDNS_MHDP_J721E),y)
> + cdns-mhdp-objs += cdns-mhdp-j721e.o
> +endif
> +
> obj-y += analogix/
> obj-y += synopsys/
> diff --git a/drivers/gpu/drm/bridge/cdns-mhdp-core.c b/drivers/gpu/drm/bridge/cdns-mhdp-core.c
> index cc642893baa8..8d07ffe2d791 100644
> --- a/drivers/gpu/drm/bridge/cdns-mhdp-core.c
> +++ b/drivers/gpu/drm/bridge/cdns-mhdp-core.c
> @@ -36,8 +36,22 @@
>
> #include "cdns-mhdp-core.h"
>

You can drop the blank line here.

> +#include "cdns-mhdp-j721e.h"
> +
> +#ifdef CONFIG_DRM_CDNS_MHDP_J721E
> +static const struct mhdp_platform_ops mhdp_ti_j721e_ops = {
> + .init = cdns_mhdp_j721e_init,
> + .exit = cdns_mhdp_j721e_fini,
> + .enable = cdns_mhdp_j721e_enable,
> + .disable = cdns_mhdp_j721e_disable,
> +};
> +#endif
> +

How about moving this structure to cdns-mhdp-j721e.c instead of exposing
the four functions ?

> static const struct of_device_id mhdp_ids[] = {
> { .compatible = "cdns,mhdp8546", },
> +#ifdef CONFIG_DRM_CDNS_MHDP_J721E
> + { .compatible = "ti,j721e-mhdp8546", .data = &mhdp_ti_j721e_ops },
> +#endif
> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(of, mhdp_ids);
> diff --git a/drivers/gpu/drm/bridge/cdns-mhdp-core.h b/drivers/gpu/drm/bridge/cdns-mhdp-core.h
> index f8df54917816..0878a6e3fd31 100644
> --- a/drivers/gpu/drm/bridge/cdns-mhdp-core.h
> +++ b/drivers/gpu/drm/bridge/cdns-mhdp-core.h
> @@ -335,6 +335,7 @@ struct mhdp_platform_ops {
>
> struct cdns_mhdp_device {
> void __iomem *regs;
> + void __iomem *j721e_regs;
>
> struct device *dev;
> struct clk *clk;
> diff --git a/drivers/gpu/drm/bridge/cdns-mhdp-j721e.c b/drivers/gpu/drm/bridge/cdns-mhdp-j721e.c
> new file mode 100644
> index 000000000000..a87faf55c065
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/cdns-mhdp-j721e.c
> @@ -0,0 +1,79 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * TI j721e Cadence MHDP DP wrapper
> + *
> + * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
> + * Author: Jyri Sarha <jsarha@ti.com
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.

You can drop this paragraph, it's implied by the SPDX header.

> + */
> +
> +#include <linux/device.h>

This should be linux/platform_device.h

> +#include <linux/io.h>
> +
> +#include "cdns-mhdp-j721e.h"
> +
> +#define REVISION 0x00
> +#define DPTX_IPCFG 0x04
> +#define ECC_MEM_CFG 0x08
> +#define DPTX_DSC_CFG 0x0c
> +#define DPTX_SRC_CFG 0x10
> +#define DPTX_VIF_SECURE_MODE_CFG 0x14
> +#define DPTX_VIF_CONN_STATUS 0x18
> +#define PHY_CLK_STATUS 0x1c
> +
> +#define DPTX_SRC_AIF_EN BIT(16)
> +#define DPTX_SRC_VIF_3_IN30B BIT(11)
> +#define DPTX_SRC_VIF_2_IN30B BIT(10)
> +#define DPTX_SRC_VIF_1_IN30B BIT(9)
> +#define DPTX_SRC_VIF_0_IN30B BIT(8)
> +#define DPTX_SRC_VIF_3_SEL_DPI5 BIT(7)
> +#define DPTX_SRC_VIF_3_SEL_DPI3 0
> +#define DPTX_SRC_VIF_2_SEL_DPI4 BIT(6)
> +#define DPTX_SRC_VIF_2_SEL_DPI2 0
> +#define DPTX_SRC_VIF_1_SEL_DPI3 BIT(5)
> +#define DPTX_SRC_VIF_1_SEL_DPI1 0
> +#define DPTX_SRC_VIF_0_SEL_DPI2 BIT(4)
> +#define DPTX_SRC_VIF_0_SEL_DPI0 0
> +#define DPTX_SRC_VIF_3_EN BIT(3)
> +#define DPTX_SRC_VIF_2_EN BIT(2)
> +#define DPTX_SRC_VIF_1_EN BIT(1)
> +#define DPTX_SRC_VIF_0_EN BIT(0)
> +
> +/* TODO turn DPTX_IPCFG fw_mem_clk_en at pm_runtime_suspend. */
> +
> +int cdns_mhdp_j721e_init(struct cdns_mhdp_device *mhdp)
> +{
> + struct platform_device *pdev = to_platform_device(mhdp->dev);
> + struct resource *regs;
> +
> + regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> + mhdp->j721e_regs = devm_ioremap_resource(&pdev->dev, regs);

You can use

mhdp->j721e_regs = devm_platform_ioremap_resource(&pdev->dev, 1);

> + if (IS_ERR(mhdp->j721e_regs))
> + return PTR_ERR(mhdp->j721e_regs);
> +
> + return 0;
> +}
> +
> +void cdns_mhdp_j721e_fini(struct cdns_mhdp_device *mhdp)
> +{
> +}
> +

To avoid the need for empty functions, how about a NULL check in the
caller ?

> +void cdns_mhdp_j721e_enable(struct cdns_mhdp_device *mhdp)
> +{
> + /*
> + * Eneble VIF_0 and select DPI2 as its input. DSS0 DPI0 is connected
> + * to eDP DPI2. This is the only supported SST configuration on
> + * J721E.

Without hardware documentation I can't really comment on this, but I'd
like to make sure it doesn't imply that the MHDP has more than one input
and one output.

> + */
> + writel(DPTX_SRC_VIF_0_EN | DPTX_SRC_VIF_0_SEL_DPI2,
> + mhdp->j721e_regs + DPTX_SRC_CFG);
> +}
> +
> +void cdns_mhdp_j721e_disable(struct cdns_mhdp_device *mhdp)
> +{
> + /* Put everything to defaults */
> + writel(0, mhdp->j721e_regs + DPTX_DSC_CFG);
> +}
> diff --git a/drivers/gpu/drm/bridge/cdns-mhdp-j721e.h b/drivers/gpu/drm/bridge/cdns-mhdp-j721e.h
> new file mode 100644
> index 000000000000..c7f9e8bc9391
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/cdns-mhdp-j721e.h
> @@ -0,0 +1,55 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * TI j721e Cadence MHDP DP wrapper
> + *
> + * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
> + * Author: Jyri Sarha <jsarha@ti.com
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.

You can drop this paragraph too.

> + */
> +
> +#ifndef CDNS_MHDP_J721E_H
> +#define CDNS_MHDP_J721E_H
> +
> +#include <linux/platform_device.h>
> +#include "cdns-mhdp-core.h"
> +
> +struct cdns_mhdp_j721e_wrap;

This is unused.

> +
> +#ifdef CONFIG_DRM_CDNS_MHDP_J721E
> +
> +int cdns_mhdp_j721e_init(struct cdns_mhdp_device *mhdp);
> +
> +void cdns_mhdp_j721e_fini(struct cdns_mhdp_device *mhdp);
> +
> +void cdns_mhdp_j721e_enable(struct cdns_mhdp_device *mhdp);
> +
> +void cdns_mhdp_j721e_disable(struct cdns_mhdp_device *mhdp);
> +
> +#else
> +
> +static inline
> +int cdns_mhdp_j721e_init(struct cdns_mhdp_device *mhdp)
> +{
> + return 0;
> +}
> +
> +static inline
> +void cdns_mhdp_j721e_fini(struct cdns_mhdp_device *mhdp)
> +{
> +}
> +
> +static inline
> +void cdns_mhdp_j721e_sst_enable(struct cdns_mhdp_device *mhdp)
> +{
> +}
> +
> +static inline
> +void cdns_mhdp_j721e_sst_disable(struct cdns_mhdp_device *mhdp)
> +{
> +}
> +#endif /* CONFIG_DRM_CDNS_MHDP_J721E */

No need for the CONFIG_DRM_CDNS_MHDP_J721E check, there's already one in
cdns-mhdp-core.c. If you follow my above suggestion, the above should
just become

struct mhdp_platform_ops;

extern const struct mhdp_platform_ops mhdp_ti_j721e_ops;

Lots of small comments but nothing blocking. After addressing them,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> +
> +#endif /* !CDNS_MHDP_J721E_H */

--
Regards,

Laurent Pinchart

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