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path: root/drivers/gpu/drm/pl111
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Diffstat (limited to 'drivers/gpu/drm/pl111')
-rw-r--r--drivers/gpu/drm/pl111/Kconfig1
-rw-r--r--drivers/gpu/drm/pl111/pl111_display.c64
-rw-r--r--drivers/gpu/drm/pl111/pl111_drm.h8
-rw-r--r--drivers/gpu/drm/pl111/pl111_drv.c138
-rw-r--r--drivers/gpu/drm/pl111/pl111_versatile.c86
5 files changed, 220 insertions, 77 deletions
diff --git a/drivers/gpu/drm/pl111/Kconfig b/drivers/gpu/drm/pl111/Kconfig
index e5e2abd66491..82cb3e60ddc8 100644
--- a/drivers/gpu/drm/pl111/Kconfig
+++ b/drivers/gpu/drm/pl111/Kconfig
@@ -8,6 +8,7 @@ config DRM_PL111
select DRM_GEM_CMA_HELPER
select DRM_BRIDGE
select DRM_PANEL_BRIDGE
+ select DRM_DUMB_VGA_DAC
select VT_HW_CONSOLE_BINDING if FRAMEBUFFER_CONSOLE
help
Choose this option for DRM support for the PL111 CLCD controller.
diff --git a/drivers/gpu/drm/pl111/pl111_display.c b/drivers/gpu/drm/pl111/pl111_display.c
index 06c4bf756b69..d75923896609 100644
--- a/drivers/gpu/drm/pl111/pl111_display.c
+++ b/drivers/gpu/drm/pl111/pl111_display.c
@@ -94,6 +94,7 @@ static void pl111_display_enable(struct drm_simple_display_pipe *pipe,
const struct drm_display_mode *mode = &cstate->mode;
struct drm_framebuffer *fb = plane->state->fb;
struct drm_connector *connector = priv->connector;
+ struct drm_bridge *bridge = priv->bridge;
u32 cntl;
u32 ppl, hsw, hfp, hbp;
u32 lpp, vsw, vfp, vbp;
@@ -137,17 +138,46 @@ static void pl111_display_enable(struct drm_simple_display_pipe *pipe,
tim2 = readl(priv->regs + CLCD_TIM2);
tim2 &= (TIM2_BCD | TIM2_PCD_LO_MASK | TIM2_PCD_HI_MASK);
+ if (priv->variant->broken_clockdivider)
+ tim2 |= TIM2_BCD;
+
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
tim2 |= TIM2_IHS;
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
tim2 |= TIM2_IVS;
- if (connector->display_info.bus_flags & DRM_BUS_FLAG_DE_LOW)
- tim2 |= TIM2_IOE;
+ if (connector) {
+ if (connector->display_info.bus_flags & DRM_BUS_FLAG_DE_LOW)
+ tim2 |= TIM2_IOE;
- if (connector->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
- tim2 |= TIM2_IPC;
+ if (connector->display_info.bus_flags &
+ DRM_BUS_FLAG_PIXDATA_NEGEDGE)
+ tim2 |= TIM2_IPC;
+ }
+
+ if (bridge) {
+ const struct drm_bridge_timings *btimings = bridge->timings;
+
+ /*
+ * Here is when things get really fun. Sometimes the bridge
+ * timings are such that the signal out from PL11x is not
+ * stable before the receiving bridge (such as a dumb VGA DAC
+ * or similar) samples it. If that happens, we compensate by
+ * the only method we have: output the data on the opposite
+ * edge of the clock so it is for sure stable when it gets
+ * sampled.
+ *
+ * The PL111 manual does not contain proper timining diagrams
+ * or data for these details, but we know from experiments
+ * that the setup time is more than 3000 picoseconds (3 ns).
+ * If we have a bridge that requires the signal to be stable
+ * earlier than 3000 ps before the clock pulse, we have to
+ * output the data on the opposite edge to avoid flicker.
+ */
+ if (btimings && btimings->setup_time_ps >= 3000)
+ tim2 ^= TIM2_IPC;
+ }
tim2 |= cpl << 16;
writel(tim2, priv->regs + CLCD_TIM2);
@@ -172,10 +202,17 @@ static void pl111_display_enable(struct drm_simple_display_pipe *pipe,
cntl |= CNTL_LCDBPP24 | CNTL_BGR;
break;
case DRM_FORMAT_BGR565:
- cntl |= CNTL_LCDBPP16_565;
+ if (priv->variant->is_pl110)
+ cntl |= CNTL_LCDBPP16;
+ else
+ cntl |= CNTL_LCDBPP16_565;
break;
case DRM_FORMAT_RGB565:
- cntl |= CNTL_LCDBPP16_565 | CNTL_BGR;
+ if (priv->variant->is_pl110)
+ cntl |= CNTL_LCDBPP16;
+ else
+ cntl |= CNTL_LCDBPP16_565;
+ cntl |= CNTL_BGR;
break;
case DRM_FORMAT_ABGR1555:
case DRM_FORMAT_XBGR1555:
@@ -199,6 +236,10 @@ static void pl111_display_enable(struct drm_simple_display_pipe *pipe,
break;
}
+ /* The PL110 in Integrator/Versatile does the BGR routing externally */
+ if (priv->variant->external_bgr)
+ cntl &= ~CNTL_BGR;
+
/* Power sequence: first enable and chill */
writel(cntl, priv->regs + priv->ctrl);
@@ -215,7 +256,8 @@ static void pl111_display_enable(struct drm_simple_display_pipe *pipe,
cntl |= CNTL_LCDPWR;
writel(cntl, priv->regs + priv->ctrl);
- drm_crtc_vblank_on(crtc);
+ if (!priv->variant->broken_vblank)
+ drm_crtc_vblank_on(crtc);
}
void pl111_display_disable(struct drm_simple_display_pipe *pipe)
@@ -225,7 +267,8 @@ void pl111_display_disable(struct drm_simple_display_pipe *pipe)
struct pl111_drm_dev_private *priv = drm->dev_private;
u32 cntl;
- drm_crtc_vblank_off(crtc);
+ if (!priv->variant->broken_vblank)
+ drm_crtc_vblank_off(crtc);
/* Power Down */
cntl = readl(priv->regs + priv->ctrl);
@@ -417,6 +460,11 @@ pl111_init_clock_divider(struct drm_device *drm)
dev_err(drm->dev, "CLCD: unable to get clcdclk.\n");
return PTR_ERR(parent);
}
+ /* If the clock divider is broken, use the parent directly */
+ if (priv->variant->broken_clockdivider) {
+ priv->clk = parent;
+ return 0;
+ }
parent_name = __clk_get_name(parent);
spin_lock_init(&priv->tim2_lock);
diff --git a/drivers/gpu/drm/pl111/pl111_drm.h b/drivers/gpu/drm/pl111/pl111_drm.h
index 07fa2cdb364a..6d0e450e51b1 100644
--- a/drivers/gpu/drm/pl111/pl111_drm.h
+++ b/drivers/gpu/drm/pl111/pl111_drm.h
@@ -36,12 +36,20 @@ struct drm_minor;
* struct pl111_variant_data - encodes IP differences
* @name: the name of this variant
* @is_pl110: this is the early PL110 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
* @formats: array of supported pixel formats on this variant
* @nformats: the length of the array of supported pixel formats
*/
struct pl111_variant_data {
const char *name;
bool is_pl110;
+ bool external_bgr;
+ bool broken_clockdivider;
+ bool broken_vblank;
const u32 *formats;
unsigned int nformats;
};
diff --git a/drivers/gpu/drm/pl111/pl111_drv.c b/drivers/gpu/drm/pl111/pl111_drv.c
index acb738c69873..1231905150d0 100644
--- a/drivers/gpu/drm/pl111/pl111_drv.c
+++ b/drivers/gpu/drm/pl111/pl111_drv.c
@@ -58,6 +58,8 @@
#include <linux/dma-buf.h>
#include <linux/module.h>
#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
@@ -85,9 +87,13 @@ static int pl111_modeset_init(struct drm_device *dev)
{
struct drm_mode_config *mode_config;
struct pl111_drm_dev_private *priv = dev->dev_private;
- struct drm_panel *panel;
- struct drm_bridge *bridge;
+ struct device_node *np = dev->dev->of_node;
+ struct device_node *remote;
+ struct drm_panel *panel = NULL;
+ struct drm_bridge *bridge = NULL;
+ bool defer = false;
int ret = 0;
+ int i;
drm_mode_config_init(dev);
mode_config = &dev->mode_config;
@@ -97,10 +103,54 @@ static int pl111_modeset_init(struct drm_device *dev)
mode_config->min_height = 1;
mode_config->max_height = 768;
- ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
- 0, 0, &panel, &bridge);
- if (ret && ret != -ENODEV)
- return ret;
+ i = 0;
+ for_each_endpoint_of_node(np, remote) {
+ struct drm_panel *tmp_panel;
+ struct drm_bridge *tmp_bridge;
+
+ dev_dbg(dev->dev, "checking endpoint %d\n", i);
+
+ ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
+ 0, i,
+ &tmp_panel,
+ &tmp_bridge);
+ if (ret) {
+ if (ret == -EPROBE_DEFER) {
+ /*
+ * Something deferred, but that is often just
+ * another way of saying -ENODEV, but let's
+ * cast a vote for later deferral.
+ */
+ defer = true;
+ } else if (ret != -ENODEV) {
+ /* Continue, maybe something else is working */
+ dev_err(dev->dev,
+ "endpoint %d returns %d\n", i, ret);
+ }
+ }
+
+ if (tmp_panel) {
+ dev_info(dev->dev,
+ "found panel on endpoint %d\n", i);
+ panel = tmp_panel;
+ }
+ if (tmp_bridge) {
+ dev_info(dev->dev,
+ "found bridge on endpoint %d\n", i);
+ bridge = tmp_bridge;
+ }
+
+ i++;
+ }
+
+ /*
+ * If we can't find neither panel nor bridge on any of the
+ * endpoints, and any of them retured -EPROBE_DEFER, then
+ * let's defer this driver too.
+ */
+ if ((!panel && !bridge) && defer)
+ return -EPROBE_DEFER;
+
if (panel) {
bridge = drm_panel_bridge_add(panel,
DRM_MODE_CONNECTOR_Unknown);
@@ -108,11 +158,17 @@ static int pl111_modeset_init(struct drm_device *dev)
ret = PTR_ERR(bridge);
goto out_config;
}
- /*
- * TODO: when we are using a different bridge than a panel
- * (such as a dumb VGA connector) we need to devise a different
- * method to get the connector out of the bridge.
- */
+ } else if (bridge) {
+ dev_info(dev->dev, "Using non-panel bridge\n");
+ } else {
+ dev_err(dev->dev, "No bridge, exiting\n");
+ return -ENODEV;
+ }
+
+ priv->bridge = bridge;
+ if (panel) {
+ priv->panel = panel;
+ priv->connector = panel->connector;
}
ret = pl111_display_init(dev);
@@ -126,14 +182,12 @@ static int pl111_modeset_init(struct drm_device *dev)
if (ret)
return ret;
- priv->bridge = bridge;
- priv->panel = panel;
- priv->connector = panel->connector;
-
- ret = drm_vblank_init(dev, 1);
- if (ret != 0) {
- dev_err(dev->dev, "Failed to init vblank\n");
- goto out_bridge;
+ if (!priv->variant->broken_vblank) {
+ ret = drm_vblank_init(dev, 1);
+ if (ret != 0) {
+ dev_err(dev->dev, "Failed to init vblank\n");
+ goto out_bridge;
+ }
}
drm_mode_config_reset(dev);
@@ -170,10 +224,6 @@ static struct drm_driver pl111_drm_driver = {
.dumb_create = drm_gem_cma_dumb_create,
.gem_free_object_unlocked = drm_gem_cma_free_object,
.gem_vm_ops = &drm_gem_cma_vm_ops,
-
- .enable_vblank = pl111_enable_vblank,
- .disable_vblank = pl111_disable_vblank,
-
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_import = drm_gem_prime_import,
@@ -191,7 +241,7 @@ static int pl111_amba_probe(struct amba_device *amba_dev,
{
struct device *dev = &amba_dev->dev;
struct pl111_drm_dev_private *priv;
- struct pl111_variant_data *variant = id->data;
+ const struct pl111_variant_data *variant = id->data;
struct drm_device *drm;
int ret;
@@ -199,6 +249,11 @@ static int pl111_amba_probe(struct amba_device *amba_dev,
if (!priv)
return -ENOMEM;
+ if (!variant->broken_vblank) {
+ pl111_drm_driver.enable_vblank = pl111_enable_vblank;
+ pl111_drm_driver.disable_vblank = pl111_disable_vblank;
+ }
+
drm = drm_dev_alloc(&pl111_drm_driver, dev);
if (IS_ERR(drm))
return PTR_ERR(drm);
@@ -207,27 +262,10 @@ static int pl111_amba_probe(struct amba_device *amba_dev,
drm->dev_private = priv;
priv->variant = variant;
- /*
- * The PL110 and PL111 variants have two registers
- * swapped: interrupt enable and control. For this reason
- * we use offsets that we can change per variant.
- */
+ /* The two variants swap this register */
if (variant->is_pl110) {
- /*
- * The ARM Versatile boards are even more special:
- * their PrimeCell ID say they are PL110 but the
- * control and interrupt enable registers are anyway
- * swapped to the PL111 order so they are not following
- * the PL110 datasheet.
- */
- if (of_machine_is_compatible("arm,versatile-ab") ||
- of_machine_is_compatible("arm,versatile-pb")) {
- priv->ienb = CLCD_PL111_IENB;
- priv->ctrl = CLCD_PL111_CNTL;
- } else {
- priv->ienb = CLCD_PL110_IENB;
- priv->ctrl = CLCD_PL110_CNTL;
- }
+ priv->ienb = CLCD_PL110_IENB;
+ priv->ctrl = CLCD_PL110_CNTL;
} else {
priv->ienb = CLCD_PL111_IENB;
priv->ctrl = CLCD_PL111_CNTL;
@@ -239,6 +277,11 @@ static int pl111_amba_probe(struct amba_device *amba_dev,
return PTR_ERR(priv->regs);
}
+ /* This may override some variant settings */
+ ret = pl111_versatile_init(dev, priv);
+ if (ret)
+ goto dev_unref;
+
/* turn off interrupts before requesting the irq */
writel(0, priv->regs + priv->ienb);
@@ -249,10 +292,6 @@ static int pl111_amba_probe(struct amba_device *amba_dev,
return ret;
}
- ret = pl111_versatile_init(dev, priv);
- if (ret)
- goto dev_unref;
-
ret = pl111_modeset_init(drm);
if (ret != 0)
goto dev_unref;
@@ -284,8 +323,7 @@ static int pl111_amba_remove(struct amba_device *amba_dev)
}
/*
- * This variant exist in early versions like the ARM Integrator
- * and this version lacks the 565 and 444 pixel formats.
+ * This early variant lacks the 565 and 444 pixel formats.
*/
static const u32 pl110_pixel_formats[] = {
DRM_FORMAT_ABGR8888,
diff --git a/drivers/gpu/drm/pl111/pl111_versatile.c b/drivers/gpu/drm/pl111/pl111_versatile.c
index 97d4af6925a3..05a4b89e0934 100644
--- a/drivers/gpu/drm/pl111/pl111_versatile.c
+++ b/drivers/gpu/drm/pl111/pl111_versatile.c
@@ -1,3 +1,4 @@
+#include <linux/amba/clcd-regs.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/regmap.h>
@@ -64,10 +65,8 @@ static const struct of_device_id versatile_clcd_of_match[] = {
#define INTEGRATOR_CLCD_LCDBIASEN BIT(8)
#define INTEGRATOR_CLCD_LCDBIASUP BIT(9)
#define INTEGRATOR_CLCD_LCDBIASDN BIT(10)
-/* Bits 11,12,13 controls the LCD type */
-#define INTEGRATOR_CLCD_LCDMUX_MASK (BIT(11)|BIT(12)|BIT(13))
+/* Bits 11,12,13 controls the LCD or VGA bridge type */
#define INTEGRATOR_CLCD_LCDMUX_LCD24 BIT(11)
-#define INTEGRATOR_CLCD_LCDMUX_VGA565 BIT(12)
#define INTEGRATOR_CLCD_LCDMUX_SHARP (BIT(11)|BIT(12))
#define INTEGRATOR_CLCD_LCDMUX_VGA555 BIT(13)
#define INTEGRATOR_CLCD_LCDMUX_VGA24 (BIT(11)|BIT(12)|BIT(13))
@@ -82,16 +81,7 @@ static const struct of_device_id versatile_clcd_of_match[] = {
/* 0 = 24bit VGA, 1 = 18bit VGA */
#define INTEGRATOR_CLCD_LCD_N24BITEN BIT(19)
-#define INTEGRATOR_CLCD_MASK (INTEGRATOR_CLCD_LCDBIASEN | \
- INTEGRATOR_CLCD_LCDBIASUP | \
- INTEGRATOR_CLCD_LCDBIASDN | \
- INTEGRATOR_CLCD_LCDMUX_MASK | \
- INTEGRATOR_CLCD_LCD0_EN | \
- INTEGRATOR_CLCD_LCD1_EN | \
- INTEGRATOR_CLCD_LCD_STATIC1 | \
- INTEGRATOR_CLCD_LCD_STATIC2 | \
- INTEGRATOR_CLCD_LCD_STATIC | \
- INTEGRATOR_CLCD_LCD_N24BITEN)
+#define INTEGRATOR_CLCD_MASK GENMASK(19, 8)
static void pl111_integrator_enable(struct drm_device *drm, u32 format)
{
@@ -106,11 +96,8 @@ static void pl111_integrator_enable(struct drm_device *drm, u32 format)
switch (format) {
case DRM_FORMAT_XBGR8888:
case DRM_FORMAT_XRGB8888:
- break;
- case DRM_FORMAT_BGR565:
- case DRM_FORMAT_RGB565:
- /* truecolor RGB565 */
- val |= INTEGRATOR_CLCD_LCDMUX_VGA565;
+ /* 24bit formats */
+ val |= INTEGRATOR_CLCD_LCDMUX_VGA24;
break;
case DRM_FORMAT_XBGR1555:
case DRM_FORMAT_XRGB1555:
@@ -217,6 +204,57 @@ static void pl111_realview_clcd_enable(struct drm_device *drm, u32 format)
SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
}
+/* PL110 pixel formats for Integrator, vanilla PL110 */
+static const u32 pl110_integrator_pixel_formats[] = {
+ DRM_FORMAT_ABGR8888,
+ DRM_FORMAT_XBGR8888,
+ DRM_FORMAT_ARGB8888,
+ DRM_FORMAT_XRGB8888,
+ DRM_FORMAT_ABGR1555,
+ DRM_FORMAT_XBGR1555,
+ DRM_FORMAT_ARGB1555,
+ DRM_FORMAT_XRGB1555,
+};
+
+/* Extended PL110 pixel formats for Integrator and Versatile */
+static const u32 pl110_versatile_pixel_formats[] = {
+ DRM_FORMAT_ABGR8888,
+ DRM_FORMAT_XBGR8888,
+ DRM_FORMAT_ARGB8888,
+ DRM_FORMAT_XRGB8888,
+ DRM_FORMAT_BGR565, /* Uses external PLD */
+ DRM_FORMAT_RGB565, /* Uses external PLD */
+ DRM_FORMAT_ABGR1555,
+ DRM_FORMAT_XBGR1555,
+ DRM_FORMAT_ARGB1555,
+ DRM_FORMAT_XRGB1555,
+};
+
+/*
+ * The Integrator variant is a PL110 with a bunch of broken, or not
+ * yet implemented features
+ */
+static const struct pl111_variant_data pl110_integrator = {
+ .name = "PL110 Integrator",
+ .is_pl110 = true,
+ .broken_clockdivider = true,
+ .broken_vblank = true,
+ .formats = pl110_integrator_pixel_formats,
+ .nformats = ARRAY_SIZE(pl110_integrator_pixel_formats),
+};
+
+/*
+ * This is the in-between PL110 variant found in the ARM Versatile,
+ * supporting RGB565/BGR565
+ */
+static const struct pl111_variant_data pl110_versatile = {
+ .name = "PL110 Versatile",
+ .is_pl110 = true,
+ .external_bgr = true,
+ .formats = pl110_versatile_pixel_formats,
+ .nformats = ARRAY_SIZE(pl110_versatile_pixel_formats),
+};
+
int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv)
{
const struct of_device_id *clcd_id;
@@ -241,14 +279,24 @@ int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv)
switch (versatile_clcd_type) {
case INTEGRATOR_CLCD_CM:
versatile_syscon_map = map;
+ priv->variant = &pl110_integrator;
priv->variant_display_enable = pl111_integrator_enable;
dev_info(dev, "set up callbacks for Integrator PL110\n");
break;
case VERSATILE_CLCD:
versatile_syscon_map = map;
+ /* This can do RGB565 with external PLD */
+ priv->variant = &pl110_versatile;
priv->variant_display_enable = pl111_versatile_enable;
priv->variant_display_disable = pl111_versatile_disable;
- dev_info(dev, "set up callbacks for Versatile PL110+\n");
+ /*
+ * The Versatile has a variant halfway between PL110
+ * and PL111 where these two registers have already been
+ * swapped.
+ */
+ priv->ienb = CLCD_PL111_IENB;
+ priv->ctrl = CLCD_PL111_CNTL;
+ dev_info(dev, "set up callbacks for Versatile PL110\n");
break;
case REALVIEW_CLCD_EB:
case REALVIEW_CLCD_PB1176:
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-27 00:03:25 +0000