[RFC PATCH 2/9] drm: bridge: Add Samsung SEC MIPI DSIM bridge driver
Jagan Teki
jagan at amarulasolutions.com
Thu Jun 24 12:11:14 UTC 2021
Hi Laurent,
On Thu, Jun 24, 2021 at 3:53 AM Laurent Pinchart
<laurent.pinchart at ideasonboard.com> wrote:
>
> Hi Jagan,
>
> Thank you for the patch.
>
> On Mon, Jun 21, 2021 at 12:54:17PM +0530, Jagan Teki wrote:
> > Samsung SEC MIPI DSIM Bridge controller is MIPI DSI bridge
> > available in NXP's i.MX8M Mini and Nano Processors.
> >
> > Add bridge driver for it.
> >
> > Cc: Andrzej Hajda <a.hajda at samsung.com>
> > Cc: Neil Armstrong <narmstrong at baylibre.com>
> > Cc: Robert Foss <robert.foss at linaro.org>
> > Cc: Laurent Pinchart <Laurent.pinchart at ideasonboard.com>
> > Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
> > ---
> > drivers/gpu/drm/bridge/Kconfig | 15 +
> > drivers/gpu/drm/bridge/Makefile | 1 +
> > drivers/gpu/drm/bridge/sec-dsim.c | 1535 +++++++++++++++++++++++++++++
> > 3 files changed, 1551 insertions(+)
> > create mode 100644 drivers/gpu/drm/bridge/sec-dsim.c
> >
> > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> > index 19109c0b5481..a183eb165a35 100644
> > --- a/drivers/gpu/drm/bridge/Kconfig
> > +++ b/drivers/gpu/drm/bridge/Kconfig
> > @@ -189,6 +189,21 @@ config DRM_PARADE_PS8640
> > The PS8640 is a high-performance and low-power
> > MIPI DSI to eDP converter
> >
> > +config DRM_SEC_MIPI_DSIM
> > + tristate "Samsung SEC MIPI DSIM Bridge controller"
> > + depends on DRM
> > + depends on COMMON_CLK
> > + depends on OF && HAS_IOMEM
> > + select DRM_KMS_HELPER
> > + select DRM_MIPI_DSI
> > + select DRM_PANEL_BRIDGE
> > + select GENERIC_PHY_MIPI_DPHY
> > + select MFD_SYSCON
> > + select REGMAP_MMIO
> > + help
> > + This enables the Samsung SEC MIPI DSIM Bridge controller as
> > + for example found on NXP's i.MX8M Mini and Nano Processors.
> > +
> > config DRM_SIL_SII8620
> > tristate "Silicon Image SII8620 HDMI/MHL bridge"
> > depends on OF
> > diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> > index 88e4edf81087..ff802a4ffe65 100644
> > --- a/drivers/gpu/drm/bridge/Makefile
> > +++ b/drivers/gpu/drm/bridge/Makefile
> > @@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v
> > obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
> > obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
> > obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o
> > +obj-$(CONFIG_DRM_SEC_MIPI_DSIM) += sec-dsim.o
> > obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o
> > obj-$(CONFIG_DRM_SII902X) += sii902x.o
> > obj-$(CONFIG_DRM_SII9234) += sii9234.o
> > diff --git a/drivers/gpu/drm/bridge/sec-dsim.c b/drivers/gpu/drm/bridge/sec-dsim.c
> > new file mode 100644
> > index 000000000000..5b6645bb94e7
> > --- /dev/null
> > +++ b/drivers/gpu/drm/bridge/sec-dsim.c
> > @@ -0,0 +1,1535 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Samsung SEC MIPI DSIM Bridge
> > + *
> > + * Copyright (C) 2018 NXP
> > + * Copyright (c) 2014 Samsung Electronics Co., Ltd
> > + * Copyright (C) 2021 Amarula Solutions(India)
> > + *
> > + * Based on the drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > + *
> > + * Authors:
> > + * Tomasz Figa <t.figa at samsung.com>
> > + * Andrzej Hajda <a.hajda at samsung.com>
> > + * Fancy Fang <chen.fang at nxp.com>
> > + * Jagan Teki <jagan at amarulasolutions.com>
> > + */
> > +
> > +#include <asm/unaligned.h>
> > +#include <linux/bitfield.h>
> > +#include <linux/clk.h>
> > +#include <linux/completion.h>
> > +#include <linux/delay.h>
> > +#include <linux/module.h>
> > +#include <linux/of_device.h>
> > +#include <linux/of_graph.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/regmap.h>
> > +
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_bridge.h>
> > +#include <drm/drm_mipi_dsi.h>
> > +#include <drm/drm_panel.h>
> > +#include <drm/drm_of.h>
> > +#include <drm/drm_print.h>
> > +
> > +#include <video/mipi_display.h>
> > +
> > +#define DRIVER_NAME "sec-dsim"
> > +
> > +/* dsim registers */
> > +#define DSIM_VERSION 0x00
> > +#define DSIM_STATUS 0x04
> > +#define DSIM_RGB_STATUS 0x08
> > +#define DSIM_SWRST 0x0c
> > +#define DSIM_CLKCTRL 0x10
> > +#define DSIM_TIMEOUT 0x14
> > +#define DSIM_CONFIG 0x18
> > +#define DSIM_ESCMODE 0x1c
> > +#define DSIM_MDRESOL 0x20
> > +#define DSIM_MVPORCH 0x24
> > +#define DSIM_MHPORCH 0x28
> > +#define DSIM_MSYNC 0x2c
> > +#define DSIM_SDRESOL 0x30
> > +#define DSIM_INTSRC 0x34
> > +#define DSIM_INTMSK 0x38
> > +#define DSIM_PKTHDR 0x3c
> > +#define DSIM_PAYLOAD 0x40
> > +#define DSIM_RXFIFO 0x44
> > +#define DSIM_FIFOTHLD 0x48
> > +#define DSIM_FIFOCTRL 0x4c
> > +#define DSIM_MEMACCHR 0x50
> > +#define DSIM_MULTI_PKT 0x78
> > +#define DSIM_PLLCTRL_1G 0x90
> > +#define DSIM_PLLCTRL 0x94
> > +#define DSIM_PLLCTRL1 0x98
> > +#define DSIM_PLLCTRL2 0x9c
> > +#define DSIM_PLLTMR 0xa0
>
> Looking at the register set, it seems to match the Exynos 5433,
> supported by drivers/gpu/drm/exynos/exynos_drm_dsi.c. Can we leverage
> that driver instead of adding a new one for the same IP core ?
I thought the same initially, but the PLLOut computation seems
different than the one in the i.MX8MM Reference Manual. I need to find
whether this exynos_dsi is compatible or working on my i.MX8MM
platform and send the next version changes accordingly. thanks.
--
Jagan Teki,
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