[PATCH v5 06/14] drm/exynos: fimd: support LCD I80 interface
YoungJun Cho
yj44.cho at samsung.com
Mon Jul 7 17:39:39 PDT 2014
To support MIPI command mode based I80 interface panel,
FIMD should do followings:
- Sets LCD I80 interface timings configuration.
- Uses "lcd_sys" as an IRQ resource and sets relevant IRQ configuration.
- Sets LCD block configuration for I80 interface.
- Sets ideal(pixel) clock is 2 times faster than the original one
to generate frame done IRQ prior to the next TE signal.
- Implements trigger feature that transfers image data if there is page
flip request, and implements TE handler to call trigger function.
Signed-off-by: YoungJun Cho <yj44.cho at samsung.com>
Acked-by: Inki Dae <inki.dae at samsung.com>
Acked-by: Kyungmin Park <kyungmin.park at samsung.com>
---
drivers/gpu/drm/exynos/Kconfig | 1 +
drivers/gpu/drm/exynos/exynos_drm_fimd.c | 276 ++++++++++++++++++++++++++-----
include/video/samsung_fimd.h | 3 +-
3 files changed, 235 insertions(+), 45 deletions(-)
diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig
index 178d2a9..9ba1aae 100644
--- a/drivers/gpu/drm/exynos/Kconfig
+++ b/drivers/gpu/drm/exynos/Kconfig
@@ -28,6 +28,7 @@ config DRM_EXYNOS_FIMD
bool "Exynos DRM FIMD"
depends on DRM_EXYNOS && !FB_S3C
select FB_MODE_HELPERS
+ select MFD_SYSCON
help
Choose this option if you want to use Exynos FIMD for DRM.
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index 33161ad..207872d 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -20,6 +20,8 @@
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/component.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h>
@@ -61,6 +63,24 @@
/* color key value register for hardware window 1 ~ 4. */
#define WKEYCON1_BASE(x) ((WKEYCON1 + 0x140) + ((x - 1) * 8))
+/* I80 / RGB trigger control register */
+#define TRIGCON 0x1A4
+#define TRGMODE_I80_RGB_ENABLE_I80 (1 << 0)
+#define SWTRGCMD_I80_RGB_ENABLE (1 << 1)
+
+/* display mode change control register except exynos4 */
+#define VIDOUT_CON 0x000
+#define VIDOUT_CON_F_I80_LDI0 (0x2 << 8)
+
+/* I80 interface control for main LDI register */
+#define I80IFCONFAx(x) (0x1B0 + (x) * 4)
+#define I80IFCONFBx(x) (0x1B8 + (x) * 4)
+#define LCD_CS_SETUP(x) ((x) << 16)
+#define LCD_WR_SETUP(x) ((x) << 12)
+#define LCD_WR_ACTIVE(x) ((x) << 8)
+#define LCD_WR_HOLD(x) ((x) << 4)
+#define I80IFEN_ENABLE (1 << 0)
+
/* FIMD has totally five hardware windows. */
#define WINDOWS_NR 5
@@ -68,10 +88,14 @@
struct fimd_driver_data {
unsigned int timing_base;
+ unsigned int lcdblk_offset;
+ unsigned int lcdblk_vt_shift;
+ unsigned int lcdblk_bypass_shift;
unsigned int has_shadowcon:1;
unsigned int has_clksel:1;
unsigned int has_limited_fmt:1;
+ unsigned int has_vidoutcon:1;
};
static struct fimd_driver_data s3c64xx_fimd_driver_data = {
@@ -82,12 +106,19 @@ static struct fimd_driver_data s3c64xx_fimd_driver_data = {
static struct fimd_driver_data exynos4_fimd_driver_data = {
.timing_base = 0x0,
+ .lcdblk_offset = 0x210,
+ .lcdblk_vt_shift = 10,
+ .lcdblk_bypass_shift = 1,
.has_shadowcon = 1,
};
static struct fimd_driver_data exynos5_fimd_driver_data = {
.timing_base = 0x20000,
+ .lcdblk_offset = 0x214,
+ .lcdblk_vt_shift = 24,
+ .lcdblk_bypass_shift = 15,
.has_shadowcon = 1,
+ .has_vidoutcon = 1,
};
struct fimd_win_data {
@@ -112,15 +143,22 @@ struct fimd_context {
struct clk *bus_clk;
struct clk *lcd_clk;
void __iomem *regs;
+ struct regmap *sysreg;
struct drm_display_mode mode;
struct fimd_win_data win_data[WINDOWS_NR];
unsigned int default_win;
unsigned long irq_flags;
+ u32 vidcon0;
u32 vidcon1;
+ u32 vidout_con;
+ u32 i80ifcon;
+ bool i80_if;
bool suspended;
int pipe;
wait_queue_head_t wait_vsync_queue;
atomic_t wait_vsync_event;
+ atomic_t win_updated;
+ atomic_t triggering;
struct exynos_drm_panel_info panel;
struct fimd_driver_data *driver_data;
@@ -243,6 +281,14 @@ static u32 fimd_calc_clkdiv(struct fimd_context *ctx,
unsigned long ideal_clk = mode->htotal * mode->vtotal * mode->vrefresh;
u32 clkdiv;
+ if (ctx->i80_if) {
+ /*
+ * The frame done interrupt should be occurred prior to the
+ * next TE signal.
+ */
+ ideal_clk *= 2;
+ }
+
/* Find the clock divider value that gets us closest to ideal_clk */
clkdiv = DIV_ROUND_UP(clk_get_rate(ctx->lcd_clk), ideal_clk);
@@ -271,11 +317,10 @@ static void fimd_commit(struct exynos_drm_manager *mgr)
{
struct fimd_context *ctx = mgr->ctx;
struct drm_display_mode *mode = &ctx->mode;
- struct fimd_driver_data *driver_data;
- u32 val, clkdiv, vidcon1;
- int vsync_len, vbpd, vfpd, hsync_len, hbpd, hfpd;
+ struct fimd_driver_data *driver_data = ctx->driver_data;
+ void *timing_base = ctx->regs + driver_data->timing_base;
+ u32 val, clkdiv;
- driver_data = ctx->driver_data;
if (ctx->suspended)
return;
@@ -283,33 +328,65 @@ static void fimd_commit(struct exynos_drm_manager *mgr)
if (mode->htotal == 0 || mode->vtotal == 0)
return;
- /* setup polarity values */
- vidcon1 = ctx->vidcon1;
- if (mode->flags & DRM_MODE_FLAG_NVSYNC)
- vidcon1 |= VIDCON1_INV_VSYNC;
- if (mode->flags & DRM_MODE_FLAG_NHSYNC)
- vidcon1 |= VIDCON1_INV_HSYNC;
- writel(vidcon1, ctx->regs + driver_data->timing_base + VIDCON1);
-
- /* setup vertical timing values. */
- vsync_len = mode->crtc_vsync_end - mode->crtc_vsync_start;
- vbpd = mode->crtc_vtotal - mode->crtc_vsync_end;
- vfpd = mode->crtc_vsync_start - mode->crtc_vdisplay;
-
- val = VIDTCON0_VBPD(vbpd - 1) |
- VIDTCON0_VFPD(vfpd - 1) |
- VIDTCON0_VSPW(vsync_len - 1);
- writel(val, ctx->regs + driver_data->timing_base + VIDTCON0);
-
- /* setup horizontal timing values. */
- hsync_len = mode->crtc_hsync_end - mode->crtc_hsync_start;
- hbpd = mode->crtc_htotal - mode->crtc_hsync_end;
- hfpd = mode->crtc_hsync_start - mode->crtc_hdisplay;
-
- val = VIDTCON1_HBPD(hbpd - 1) |
- VIDTCON1_HFPD(hfpd - 1) |
- VIDTCON1_HSPW(hsync_len - 1);
- writel(val, ctx->regs + driver_data->timing_base + VIDTCON1);
+ if (ctx->i80_if) {
+ val = ctx->i80ifcon | I80IFEN_ENABLE;
+ writel(val, timing_base + I80IFCONFAx(0));
+
+ /* disable auto frame rate */
+ writel(0, timing_base + I80IFCONFBx(0));
+
+ if (ctx->vidout_con)
+ writel(ctx->vidout_con, timing_base + VIDOUT_CON);
+
+ /* set video type selection to I80 interface */
+ if (ctx->sysreg && regmap_update_bits(ctx->sysreg,
+ driver_data->lcdblk_offset,
+ 0x3 << driver_data->lcdblk_vt_shift,
+ 0x1 << driver_data->lcdblk_vt_shift)) {
+ DRM_ERROR("Failed to update sysreg for I80 i/f.\n");
+ return;
+ }
+ } else {
+ int vsync_len, vbpd, vfpd, hsync_len, hbpd, hfpd;
+ u32 vidcon1;
+
+ /* setup polarity values */
+ vidcon1 = ctx->vidcon1;
+ if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+ vidcon1 |= VIDCON1_INV_VSYNC;
+ if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+ vidcon1 |= VIDCON1_INV_HSYNC;
+ writel(vidcon1, ctx->regs + driver_data->timing_base + VIDCON1);
+
+ /* setup vertical timing values. */
+ vsync_len = mode->crtc_vsync_end - mode->crtc_vsync_start;
+ vbpd = mode->crtc_vtotal - mode->crtc_vsync_end;
+ vfpd = mode->crtc_vsync_start - mode->crtc_vdisplay;
+
+ val = VIDTCON0_VBPD(vbpd - 1) |
+ VIDTCON0_VFPD(vfpd - 1) |
+ VIDTCON0_VSPW(vsync_len - 1);
+ writel(val, ctx->regs + driver_data->timing_base + VIDTCON0);
+
+ /* setup horizontal timing values. */
+ hsync_len = mode->crtc_hsync_end - mode->crtc_hsync_start;
+ hbpd = mode->crtc_htotal - mode->crtc_hsync_end;
+ hfpd = mode->crtc_hsync_start - mode->crtc_hdisplay;
+
+ val = VIDTCON1_HBPD(hbpd - 1) |
+ VIDTCON1_HFPD(hfpd - 1) |
+ VIDTCON1_HSPW(hsync_len - 1);
+ writel(val, ctx->regs + driver_data->timing_base + VIDTCON1);
+ }
+
+ /* set bypass selection */
+ if (ctx->sysreg && regmap_update_bits(ctx->sysreg,
+ driver_data->lcdblk_offset,
+ 0x1 << driver_data->lcdblk_bypass_shift,
+ 0x1 << driver_data->lcdblk_bypass_shift)) {
+ DRM_ERROR("Failed to update sysreg for bypass setting.\n");
+ return;
+ }
/* setup horizontal and vertical display size. */
val = VIDTCON2_LINEVAL(mode->vdisplay - 1) |
@@ -322,7 +399,8 @@ static void fimd_commit(struct exynos_drm_manager *mgr)
* fields of register with prefix '_F' would be updated
* at vsync(same as dma start)
*/
- val = VIDCON0_ENVID | VIDCON0_ENVID_F;
+ val = ctx->vidcon0;
+ val |= VIDCON0_ENVID | VIDCON0_ENVID_F;
if (ctx->driver_data->has_clksel)
val |= VIDCON0_CLKSEL_LCD;
@@ -660,6 +738,9 @@ static void fimd_win_commit(struct exynos_drm_manager *mgr, int zpos)
}
win_data->enabled = true;
+
+ if (ctx->i80_if)
+ atomic_set(&ctx->win_updated, 1);
}
static void fimd_win_disable(struct exynos_drm_manager *mgr, int zpos)
@@ -838,6 +919,58 @@ static void fimd_dpms(struct exynos_drm_manager *mgr, int mode)
}
}
+static void fimd_trigger(struct device *dev)
+{
+ struct exynos_drm_manager *mgr = get_fimd_manager(dev);
+ struct fimd_context *ctx = mgr->ctx;
+ struct fimd_driver_data *driver_data = ctx->driver_data;
+ void *timing_base = ctx->regs + driver_data->timing_base;
+ u32 reg;
+
+ atomic_set(&ctx->triggering, 1);
+
+ reg = readl(ctx->regs + VIDINTCON0);
+ reg |= (VIDINTCON0_INT_ENABLE | VIDINTCON0_INT_I80IFDONE |
+ VIDINTCON0_INT_SYSMAINCON);
+ writel(reg, ctx->regs + VIDINTCON0);
+
+ reg = readl(timing_base + TRIGCON);
+ reg |= (TRGMODE_I80_RGB_ENABLE_I80 | SWTRGCMD_I80_RGB_ENABLE);
+ writel(reg, timing_base + TRIGCON);
+}
+
+static void fimd_te_handler(struct exynos_drm_manager *mgr)
+{
+ struct fimd_context *ctx = mgr->ctx;
+
+ /* Checks the crtc is detached already from encoder */
+ if (ctx->pipe < 0 || !ctx->drm_dev)
+ return;
+
+ /*
+ * Skips to trigger if in triggering state, because multiple triggering
+ * requests can cause panel reset.
+ */
+ if (atomic_read(&ctx->triggering))
+ return;
+
+ /*
+ * If there is a page flip request, triggers and handles the page flip
+ * event so that current fb can be updated into panel GRAM.
+ */
+ if (atomic_add_unless(&ctx->win_updated, -1, 0))
+ fimd_trigger(ctx->dev);
+
+ /* Wakes up vsync event queue */
+ if (atomic_read(&ctx->wait_vsync_event)) {
+ atomic_set(&ctx->wait_vsync_event, 0);
+ wake_up(&ctx->wait_vsync_queue);
+
+ if (!atomic_read(&ctx->triggering))
+ drm_handle_vblank(ctx->drm_dev, ctx->pipe);
+ }
+}
+
static struct exynos_drm_manager_ops fimd_manager_ops = {
.dpms = fimd_dpms,
.mode_fixup = fimd_mode_fixup,
@@ -849,6 +982,7 @@ static struct exynos_drm_manager_ops fimd_manager_ops = {
.win_mode_set = fimd_win_mode_set,
.win_commit = fimd_win_commit,
.win_disable = fimd_win_disable,
+ .te_handler = fimd_te_handler,
};
static struct exynos_drm_manager fimd_manager = {
@@ -859,26 +993,40 @@ static struct exynos_drm_manager fimd_manager = {
static irqreturn_t fimd_irq_handler(int irq, void *dev_id)
{
struct fimd_context *ctx = (struct fimd_context *)dev_id;
- u32 val;
+ u32 val, clear_bit;
val = readl(ctx->regs + VIDINTCON1);
- if (val & VIDINTCON1_INT_FRAME)
- /* VSYNC interrupt */
- writel(VIDINTCON1_INT_FRAME, ctx->regs + VIDINTCON1);
+ clear_bit = ctx->i80_if ? VIDINTCON1_INT_I80 : VIDINTCON1_INT_FRAME;
+ if (val & clear_bit)
+ writel(clear_bit, ctx->regs + VIDINTCON1);
/* check the crtc is detached already from encoder */
if (ctx->pipe < 0 || !ctx->drm_dev)
goto out;
- drm_handle_vblank(ctx->drm_dev, ctx->pipe);
- exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe);
+ if (ctx->i80_if) {
+ /* unset I80 frame done interrupt */
+ val = readl(ctx->regs + VIDINTCON0);
+ val &= ~(VIDINTCON0_INT_I80IFDONE | VIDINTCON0_INT_SYSMAINCON);
+ writel(val, ctx->regs + VIDINTCON0);
- /* set wait vsync event to zero and wake up queue. */
- if (atomic_read(&ctx->wait_vsync_event)) {
- atomic_set(&ctx->wait_vsync_event, 0);
- wake_up(&ctx->wait_vsync_queue);
+ /* exit triggering mode */
+ atomic_set(&ctx->triggering, 0);
+
+ drm_handle_vblank(ctx->drm_dev, ctx->pipe);
+ exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe);
+ } else {
+ drm_handle_vblank(ctx->drm_dev, ctx->pipe);
+ exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe);
+
+ /* set wait vsync event to zero and wake up queue. */
+ if (atomic_read(&ctx->wait_vsync_event)) {
+ atomic_set(&ctx->wait_vsync_event, 0);
+ wake_up(&ctx->wait_vsync_queue);
+ }
}
+
out:
return IRQ_HANDLED;
}
@@ -923,6 +1071,7 @@ static int fimd_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct fimd_context *ctx;
+ struct device_node *i80_if_timings;
struct resource *res;
int ret = -EINVAL;
@@ -944,12 +1093,51 @@ static int fimd_probe(struct platform_device *pdev)
ctx->dev = dev;
ctx->suspended = true;
+ ctx->driver_data = drm_fimd_get_driver_data(pdev);
if (of_property_read_bool(dev->of_node, "samsung,invert-vden"))
ctx->vidcon1 |= VIDCON1_INV_VDEN;
if (of_property_read_bool(dev->of_node, "samsung,invert-vclk"))
ctx->vidcon1 |= VIDCON1_INV_VCLK;
+ i80_if_timings = of_get_child_by_name(dev->of_node, "i80-if-timings");
+ if (i80_if_timings) {
+ u32 val;
+
+ ctx->i80_if = true;
+
+ if (ctx->driver_data->has_vidoutcon)
+ ctx->vidout_con |= VIDOUT_CON_F_I80_LDI0;
+ else
+ ctx->vidcon0 |= VIDCON0_VIDOUT_I80_LDI0;
+ /*
+ * The user manual describes that this "DSI_EN" bit is required
+ * to enable I80 24-bit data interface.
+ */
+ ctx->vidcon0 |= VIDCON0_DSI_EN;
+
+ if (of_property_read_u32(i80_if_timings, "cs-setup", &val))
+ val = 0;
+ ctx->i80ifcon = LCD_CS_SETUP(val);
+ if (of_property_read_u32(i80_if_timings, "wr-setup", &val))
+ val = 0;
+ ctx->i80ifcon |= LCD_WR_SETUP(val);
+ if (of_property_read_u32(i80_if_timings, "wr-active", &val))
+ val = 1;
+ ctx->i80ifcon |= LCD_WR_ACTIVE(val);
+ if (of_property_read_u32(i80_if_timings, "wr-hold", &val))
+ val = 0;
+ ctx->i80ifcon |= LCD_WR_HOLD(val);
+ }
+ of_node_put(i80_if_timings);
+
+ ctx->sysreg = syscon_regmap_lookup_by_phandle(dev->of_node,
+ "samsung,sysreg");
+ if (IS_ERR(ctx->sysreg)) {
+ dev_warn(dev, "failed to get system register.\n");
+ ctx->sysreg = NULL;
+ }
+
ctx->bus_clk = devm_clk_get(dev, "fimd");
if (IS_ERR(ctx->bus_clk)) {
dev_err(dev, "failed to get bus clock\n");
@@ -972,7 +1160,8 @@ static int fimd_probe(struct platform_device *pdev)
goto err_del_component;
}
- res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "vsync");
+ res = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
+ ctx->i80_if ? "lcd_sys" : "vsync");
if (!res) {
dev_err(dev, "irq request failed.\n");
ret = -ENXIO;
@@ -986,7 +1175,6 @@ static int fimd_probe(struct platform_device *pdev)
goto err_del_component;
}
- ctx->driver_data = drm_fimd_get_driver_data(pdev);
init_waitqueue_head(&ctx->wait_vsync_queue);
atomic_set(&ctx->wait_vsync_event, 0);
diff --git a/include/video/samsung_fimd.h b/include/video/samsung_fimd.h
index b039320..eaad58b 100644
--- a/include/video/samsung_fimd.h
+++ b/include/video/samsung_fimd.h
@@ -19,6 +19,7 @@
/* VIDCON0 */
#define VIDCON0 0x00
+#define VIDCON0_DSI_EN (1 << 30)
#define VIDCON0_INTERLACE (1 << 29)
#define VIDCON0_VIDOUT_MASK (0x7 << 26)
#define VIDCON0_VIDOUT_SHIFT 26
@@ -355,7 +356,7 @@
#define VIDINTCON0_INT_ENABLE (1 << 0)
#define VIDINTCON1 0x134
-#define VIDINTCON1_INT_I180 (1 << 2)
+#define VIDINTCON1_INT_I80 (1 << 2)
#define VIDINTCON1_INT_FRAME (1 << 1)
#define VIDINTCON1_INT_FIFO (1 << 0)
--
1.9.0
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