Hi Laurent,

On Thu, Jun 24, 2021 at 3:53 AM Laurent Pinchart
[off-list ref] wrote:

Hi Jagan,

Thank you for the patch.

On Mon, Jun 21, 2021 at 12:54:17PM +0530, Jagan Teki wrote:

quoted

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 <redacted>
Cc: Neil Armstrong <redacted>
Cc: Robert Foss <redacted>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Signed-off-by: Jagan Teki <jagan@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@samsung.com>
+ * Andrzej Hajda <a.hajda@samsung.com>
+ * Fancy Fang <chen.fang@nxp.com>
+ * Jagan Teki <jagan@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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