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drm/exynos: fimd: support LCD I80 interface 

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@samsung.com>
Acked-by: Inki Dae <inki.dae@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
YoungJun Cho 2014-07-17 18:01:21 +09:00 committed by Inki Dae
parent e17ddecc3a
commit 3854fab24e
3 changed files with 231 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/exynos/Kconfig
View File

@ -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.

268
drivers/gpu/drm/exynos/exynos_drm_fimd.c
View File

@ -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);
if (ctx->i80_if) {
val = ctx->i80ifcon | I80IFEN_ENABLE;
writel(val, timing_base + I80IFCONFAx(0));
/* 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;
/* disable auto frame rate */
writel(0, timing_base + I80IFCONFBx(0));
val = VIDTCON0_VBPD(vbpd - 1) |
VIDTCON0_VFPD(vfpd - 1) |
VIDTCON0_VSPW(vsync_len - 1);
writel(val, ctx->regs + driver_data->timing_base + VIDTCON0);
/* 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 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;
/* 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);
val = VIDTCON1_HBPD(hbpd - 1) |
VIDTCON1_HFPD(hfpd - 1) |
VIDTCON1_HSPW(hsync_len - 1);
writel(val, ctx->regs + driver_data->timing_base + VIDTCON1);
/* 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 (driver_data->has_vidoutcon)
writel(ctx->vidout_con, timing_base + VIDOUT_CON);
/* 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);

3
include/video/samsung_fimd.h
View File

@ -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)