[PATCH] drm/pl111: Support Nomadik LCDC variant
Linus Walleij
linus.walleij at linaro.org
Thu Jun 21 18:44:50 UTC 2018
The Nomadik has a variant of the PL110 known as "Color LCD
Controller" LCDC. This variant has the same bit ordering as
the DRM subsystem (in difference from the other variants)
and adds a few bits for the control of 5551, 565 etc in the
control register. Notably it also adds a packed RGB888
24BPP mode.
We add support by detecting this variant and also adding a
small plug-in that will mux the LCDC out if the ASIC happens
to be muxed to the other graphics controller (they are
mutually exclusive).
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
---
drivers/gpu/drm/pl111/Makefile | 1 +
drivers/gpu/drm/pl111/pl111_display.c | 54 ++++++++++++++++++++++-----
drivers/gpu/drm/pl111/pl111_drm.h | 5 +++
drivers/gpu/drm/pl111/pl111_drv.c | 41 +++++++++++++++++++-
drivers/gpu/drm/pl111/pl111_nomadik.c | 36 ++++++++++++++++++
drivers/gpu/drm/pl111/pl111_nomadik.h | 18 +++++++++
6 files changed, 144 insertions(+), 11 deletions(-)
create mode 100644 drivers/gpu/drm/pl111/pl111_nomadik.c
create mode 100644 drivers/gpu/drm/pl111/pl111_nomadik.h
diff --git a/drivers/gpu/drm/pl111/Makefile b/drivers/gpu/drm/pl111/Makefile
index 19a8189dc54f..0c70f0e91d21 100644
--- a/drivers/gpu/drm/pl111/Makefile
+++ b/drivers/gpu/drm/pl111/Makefile
@@ -4,6 +4,7 @@ pl111_drm-y += pl111_display.o \
pl111_drv.o
pl111_drm-$(CONFIG_ARCH_VEXPRESS) += pl111_vexpress.o
+pl111_drm-$(CONFIG_ARCH_NOMADIK) += pl111_nomadik.o
pl111_drm-$(CONFIG_DEBUG_FS) += pl111_debugfs.o
obj-$(CONFIG_DRM_PL111) += pl111_drm.o
diff --git a/drivers/gpu/drm/pl111/pl111_display.c b/drivers/gpu/drm/pl111/pl111_display.c
index 19b0d006a54a..a432eb7ad445 100644
--- a/drivers/gpu/drm/pl111/pl111_display.c
+++ b/drivers/gpu/drm/pl111/pl111_display.c
@@ -223,48 +223,84 @@ static void pl111_display_enable(struct drm_simple_display_pipe *pipe,
/* Hard-code TFT panel */
cntl = CNTL_LCDEN | CNTL_LCDTFT | CNTL_LCDVCOMP(1);
+ /* On the ST Micro variant, assume all 24 bits are connected */
+ if (priv->variant->st_bitmux_control)
+ cntl |= CNTL_ST_CDWID_24;
- /* Note that the the hardware's format reader takes 'r' from
+ /*
+ * Note that the the ARM hardware's format reader takes 'r' from
* the low bit, while DRM formats list channels from high bit
- * to low bit as you read left to right.
+ * to low bit as you read left to right. The ST Micro version of
+ * the PL110 (LCDC) however uses the standard DRM format.
*/
switch (fb->format->format) {
+ case DRM_FORMAT_BGR888:
+ /* Only supported on the ST Micro variant */
+ if (priv->variant->st_bitmux_control)
+ cntl |= CNTL_ST_LCDBPP24_PACKED | CNTL_BGR;
+ break;
+ case DRM_FORMAT_RGB888:
+ /* Only supported on the ST Micro variant */
+ if (priv->variant->st_bitmux_control)
+ cntl |= CNTL_ST_LCDBPP24_PACKED;
+ break;
case DRM_FORMAT_ABGR8888:
case DRM_FORMAT_XBGR8888:
- cntl |= CNTL_LCDBPP24;
+ if (priv->variant->st_bitmux_control)
+ cntl |= CNTL_LCDBPP24 | CNTL_BGR;
+ else
+ cntl |= CNTL_LCDBPP24;
break;
case DRM_FORMAT_ARGB8888:
case DRM_FORMAT_XRGB8888:
- cntl |= CNTL_LCDBPP24 | CNTL_BGR;
+ if (priv->variant->st_bitmux_control)
+ cntl |= CNTL_LCDBPP24;
+ else
+ cntl |= CNTL_LCDBPP24 | CNTL_BGR;
break;
case DRM_FORMAT_BGR565:
if (priv->variant->is_pl110)
cntl |= CNTL_LCDBPP16;
+ else if (priv->variant->st_bitmux_control)
+ cntl |= CNTL_LCDBPP16 | CNTL_ST_1XBPP_565 | CNTL_BGR;
else
cntl |= CNTL_LCDBPP16_565;
break;
case DRM_FORMAT_RGB565:
if (priv->variant->is_pl110)
- cntl |= CNTL_LCDBPP16;
+ cntl |= CNTL_LCDBPP16 | CNTL_BGR;
+ else if (priv->variant->st_bitmux_control)
+ cntl |= CNTL_LCDBPP16 | CNTL_ST_1XBPP_565;
else
- cntl |= CNTL_LCDBPP16_565;
- cntl |= CNTL_BGR;
+ cntl |= CNTL_LCDBPP16_565 | CNTL_BGR;
break;
case DRM_FORMAT_ABGR1555:
case DRM_FORMAT_XBGR1555:
cntl |= CNTL_LCDBPP16;
+ if (priv->variant->st_bitmux_control)
+ cntl |= CNTL_ST_1XBPP_5551 | CNTL_BGR;
break;
case DRM_FORMAT_ARGB1555:
case DRM_FORMAT_XRGB1555:
- cntl |= CNTL_LCDBPP16 | CNTL_BGR;
+ cntl |= CNTL_LCDBPP16;
+ if (priv->variant->st_bitmux_control)
+ cntl |= CNTL_ST_1XBPP_5551;
+ else
+ cntl |= CNTL_BGR;
break;
case DRM_FORMAT_ABGR4444:
case DRM_FORMAT_XBGR4444:
cntl |= CNTL_LCDBPP16_444;
+ if (priv->variant->st_bitmux_control)
+ cntl |= CNTL_ST_1XBPP_444 | CNTL_BGR;
break;
case DRM_FORMAT_ARGB4444:
case DRM_FORMAT_XRGB4444:
- cntl |= CNTL_LCDBPP16_444 | CNTL_BGR;
+ cntl |= CNTL_LCDBPP16_444;
+ if (priv->variant->st_bitmux_control)
+ cntl |= CNTL_ST_1XBPP_444;
+ else
+ cntl |= CNTL_BGR;
break;
default:
WARN_ONCE(true, "Unknown FB format 0x%08x\n",
diff --git a/drivers/gpu/drm/pl111/pl111_drm.h b/drivers/gpu/drm/pl111/pl111_drm.h
index ce4501d0ab48..1aa015ccacef 100644
--- a/drivers/gpu/drm/pl111/pl111_drm.h
+++ b/drivers/gpu/drm/pl111/pl111_drm.h
@@ -36,11 +36,14 @@ struct drm_minor;
* struct pl111_variant_data - encodes IP differences
* @name: the name of this variant
* @is_pl110: this is the early PL110 variant
+ * @is_lcdc: this is the ST Microelectronics Nomadik LCDC variant
* @external_bgr: this is the Versatile Pl110 variant with external
* BGR/RGB routing
* @broken_clockdivider: the clock divider is broken and we need to
* use the supplied clock directly
* @broken_vblank: the vblank IRQ is broken on this variant
+ * @st_bitmux_control: this variant is using the ST Micro bitmux
+ * extensions to the control register
* @formats: array of supported pixel formats on this variant
* @nformats: the length of the array of supported pixel formats
* @fb_bpp: desired bits per pixel on the default framebuffer
@@ -48,9 +51,11 @@ struct drm_minor;
struct pl111_variant_data {
const char *name;
bool is_pl110;
+ bool is_lcdc;
bool external_bgr;
bool broken_clockdivider;
bool broken_vblank;
+ bool st_bitmux_control;
const u32 *formats;
unsigned int nformats;
unsigned int fb_bpp;
diff --git a/drivers/gpu/drm/pl111/pl111_drv.c b/drivers/gpu/drm/pl111/pl111_drv.c
index 454ff0804642..46559b686abd 100644
--- a/drivers/gpu/drm/pl111/pl111_drv.c
+++ b/drivers/gpu/drm/pl111/pl111_drv.c
@@ -75,6 +75,7 @@
#include "pl111_drm.h"
#include "pl111_versatile.h"
+#include "pl111_nomadik.h"
#define DRIVER_DESC "DRM module for PL111"
@@ -288,8 +289,8 @@ static int pl111_amba_probe(struct amba_device *amba_dev,
priv->memory_bw = 0;
}
- /* The two variants swap this register */
- if (variant->is_pl110) {
+ /* The two main variants swap this register */
+ if (variant->is_pl110 || variant->is_lcdc) {
priv->ienb = CLCD_PL110_IENB;
priv->ctrl = CLCD_PL110_CNTL;
} else {
@@ -308,6 +309,7 @@ static int pl111_amba_probe(struct amba_device *amba_dev,
ret = pl111_versatile_init(dev, priv);
if (ret)
goto dev_unref;
+ pl111_nomadik_init(dev);
/* turn off interrupts before requesting the irq */
writel(0, priv->regs + priv->ienb);
@@ -400,12 +402,47 @@ static const struct pl111_variant_data pl111_variant = {
.fb_bpp = 32,
};
+static const u32 pl110_nomadik_pixel_formats[] = {
+ DRM_FORMAT_RGB888,
+ DRM_FORMAT_BGR888,
+ DRM_FORMAT_ABGR8888,
+ DRM_FORMAT_XBGR8888,
+ DRM_FORMAT_ARGB8888,
+ DRM_FORMAT_XRGB8888,
+ DRM_FORMAT_BGR565,
+ DRM_FORMAT_RGB565,
+ DRM_FORMAT_ABGR1555,
+ DRM_FORMAT_XBGR1555,
+ DRM_FORMAT_ARGB1555,
+ DRM_FORMAT_XRGB1555,
+ DRM_FORMAT_ABGR4444,
+ DRM_FORMAT_XBGR4444,
+ DRM_FORMAT_ARGB4444,
+ DRM_FORMAT_XRGB4444,
+};
+
+static const struct pl111_variant_data pl110_nomadik_variant = {
+ .name = "LCDC (PL110 Nomadik)",
+ .formats = pl110_nomadik_pixel_formats,
+ .nformats = ARRAY_SIZE(pl110_nomadik_pixel_formats),
+ .is_lcdc = true,
+ .st_bitmux_control = true,
+ .broken_vblank = true,
+ .fb_bpp = 16,
+};
+
+
static const struct amba_id pl111_id_table[] = {
{
.id = 0x00041110,
.mask = 0x000fffff,
.data = (void*)&pl110_variant,
},
+ {
+ .id = 0x00180110,
+ .mask = 0x00fffffe,
+ .data = (void*)&pl110_nomadik_variant,
+ },
{
.id = 0x00041111,
.mask = 0x000fffff,
diff --git a/drivers/gpu/drm/pl111/pl111_nomadik.c b/drivers/gpu/drm/pl111/pl111_nomadik.c
new file mode 100644
index 000000000000..6ade7ca9d367
--- /dev/null
+++ b/drivers/gpu/drm/pl111/pl111_nomadik.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include "pl111_nomadik.h"
+
+#define PMU_CTRL_OFFSET 0x0000
+#define PMU_CTRL_LCDNDIF BIT(26)
+
+void pl111_nomadik_init(struct device *dev)
+{
+ struct regmap *pmu_regmap;
+
+ /*
+ * Just bail out of this is not found, we could be running
+ * multiplatform on something else than Nomadik.
+ */
+ pmu_regmap =
+ syscon_regmap_lookup_by_compatible("stericsson,nomadik-pmu");
+ if (IS_ERR(pmu_regmap))
+ return;
+
+ /*
+ * This bit in the PMU controller multiplexes the two graphics
+ * blocks found in the Nomadik STn8815. The other one is called
+ * MDIF (Master Display Interface) and gets muxed out here.
+ */
+ regmap_update_bits(pmu_regmap,
+ PMU_CTRL_OFFSET,
+ PMU_CTRL_LCDNDIF,
+ 0);
+ dev_info(dev, "set Nomadik PMU mux to CLCD mode\n");
+}
+EXPORT_SYMBOL_GPL(pl111_nomadik_init);
diff --git a/drivers/gpu/drm/pl111/pl111_nomadik.h b/drivers/gpu/drm/pl111/pl111_nomadik.h
new file mode 100644
index 000000000000..c408842a1c73
--- /dev/null
+++ b/drivers/gpu/drm/pl111/pl111_nomadik.h
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/device.h>
+
+#ifndef PL111_NOMADIK_H
+#define PL111_NOMADIK_H
+#endif
+
+#ifdef CONFIG_ARCH_NOMADIK
+
+void pl111_nomadik_init(struct device *dev);
+
+#else
+
+static inline void pl111_nomadik_init(struct device *dev)
+{
+}
+
+#endif
--
2.17.1
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