[PATCH v2 10/18] drm/exynos: fimd: support I80 interface
Daniel Kurtz
djkurtz at chromium.org
Mon May 26 02:00:06 PDT 2014
Hi YoungJun,
I am not famiilar with i80. Reading through this patch, it looks like
it works something like below for a page flip...
-> page_flip ioctl
exynos_drm_crtc_page_flip()
exynos_drm_crtc_mode_set_commit()
exynos_plane_mode_set()
exynos_drm_crtc_commit()
exynos_plane_commit()
exynos_drm_crtc_plane_commit()
ops->win_commit() => fimd_win_commit()
update BASE (scanout) register
atomic_set(&ctx->win_updated, 1);
... at the next TE event ...
fimd_te_handler()
atomic_set(&ctx->win_updated, 0);
fimd_trigger(ctx->dev);
atomic_set(&ctx->triggering, 1);
VIDINTCON0 |= VIDINTCON0_INT_ENABLE;
TRIGCON |= TRGMODE_I80_RGB_ENABLE_I80 | SWTRGCMD_I80_RGB_ENABLE
... start an i80 transaction to transfer frame data from BASE to
the panel ...
... write complete signalled by ...
-> FIMD interrupt: source = VIDINTCON0_INT_I80IFDONE |
VIDINTCON0_INT_SYSMAINCON (which one?)
fimd_irq_handler()
atomic_set(&ctx->triggering, 0);
drm_handle_vblank(ctx->drm_dev, ctx->pipe);
exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe);
Some questions/points:
(1) does the "i80 done" interrupt mean that the panel is now
displaying the new frame? Or just that the new frame is pending in a
panel-side scanout buffer? Is there a separate interrupt for (a) "i80
transfer complete", and (b) "new frame now on main display"?
(2) from the "DPMS off" patch, you mentioned that the panel sometimes
has an issue. Do you mean that sometimes when you trigger the i80
transaction, there is no corresponding "i80ifdone / sysmaincon"
interrupt? If so, then I think you want to start a timer in
fimd_trigger(), that, if it expires before an I80IFDONE irq, will call
exynos_drm_crtc_finish_pageflip(), rather than hiding handling this
condition in dpms off of the exynos_drm_crtc.c layer.
Thanks,
-djk
On Wed, May 21, 2014 at 12:43 PM, YoungJun Cho <yj44.cho at samsung.com> wrote:
> To support MIPI DSI command mode interface, FIMD should do followings:
> - Sets LCD block configuration for I80 interface.
> - Uses "lcd_sys" as an IRQ resource and sets relevant IRQ configuration.
> - Implements trigger feature which transfers image date if there is
> page flip request, and implements TE handler to call trigger function.
> - Sets command mode timings configuration.
> - Sets ideal(pixel) clock is 2 times faster than the original one to
> generate frame done IRQ prior to the next TE signal.
>
> 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 | 277 +++++++++++++++++++++++++-----
> include/video/samsung_fimd.h | 3 +-
> 3 files changed, 237 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig
> index 5bf5bca..f4d34f0 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 && !ARCH_MULTIPLATFORM
> 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 173ee97..9d585f9 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> @@ -20,11 +20,14 @@
> #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>
> #include <video/samsung_fimd.h>
> #include <drm/exynos_drm.h>
> +#include <drm/drm_panel.h>
>
> #include "exynos_drm_drv.h"
> #include "exynos_drm_fbdev.h"
> @@ -60,6 +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_ACT(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
>
> @@ -67,10 +88,14 @@
>
> struct fimd_driver_data {
> unsigned int timing_base;
> + unsigned int lcdblk_off;
> + 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 = {
> @@ -81,12 +106,19 @@ static struct fimd_driver_data s3c64xx_fimd_driver_data = {
>
> static struct fimd_driver_data exynos4_fimd_driver_data = {
> .timing_base = 0x0,
> + .lcdblk_off = 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_off = 0x214,
> + .lcdblk_vt_shift = 24,
> + .lcdblk_bypass_shift = 15,
> .has_shadowcon = 1,
> + .has_vidoutcon = 1,
> };
>
> struct fimd_win_data {
> @@ -111,15 +143,23 @@ 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;
> + spinlock_t win_updated_lock;
>
> struct exynos_drm_panel_info panel;
> struct fimd_driver_data *driver_data;
> @@ -242,6 +282,14 @@ 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);
>
> @@ -264,17 +312,23 @@ static void fimd_mode_set(struct exynos_drm_manager *mgr,
> struct fimd_context *ctx = mgr->ctx;
>
> drm_mode_copy(&ctx->mode, in_mode);
> +
> + if (ctx->i80_if) {
> + ctx->i80ifcon = LCD_CS_SETUP(in_mode->cs_setup);
> + ctx->i80ifcon |= LCD_WR_SETUP(in_mode->wr_setup);
> + ctx->i80ifcon |= LCD_WR_ACT(in_mode->wr_active);
> + ctx->i80ifcon |= LCD_WR_HOLD(in_mode->wr_hold);
> + }
> }
>
> 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;
>
> @@ -282,33 +336,65 @@ 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_off,
> + 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_off,
> + 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) |
> @@ -646,6 +732,14 @@ static void fimd_win_commit(struct exynos_drm_manager *mgr, int zpos)
> }
>
> win_data->enabled = true;
> +
> + if (ctx->i80_if) {
> + unsigned long flags;
> +
> + spin_lock_irqsave(&ctx->win_updated_lock, flags);
> + atomic_set(&ctx->win_updated, 1);
> + spin_unlock_irqrestore(&ctx->win_updated_lock, flags);
> + }
> }
>
> static void fimd_win_disable(struct exynos_drm_manager *mgr, int zpos)
> @@ -835,6 +929,68 @@ 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 int fimd_te_handler(struct exynos_drm_manager *mgr)
> +{
> + struct fimd_context *ctx = mgr->ctx;
> + unsigned long flags;
> +
> + /* check the crtc is detached already from encoder */
> + if (ctx->pipe < 0 || !ctx->drm_dev)
> + return -EINVAL;
> +
> + /*
> + * Skips to trigger if in triggering state, because multiple triggering
> + * requests can cause panel reset.
> + */
> + if (atomic_read(&ctx->triggering))
> + return 0;
> +
> + spin_lock_irqsave(&ctx->win_updated_lock, flags);
> +
> + /*
> + * 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_read(&ctx->win_updated)) {
> + atomic_set(&ctx->win_updated, 0);
> +
> + fimd_trigger(ctx->dev);
> + }
> +
> + spin_unlock_irqrestore(&ctx->win_updated_lock, flags);
> +
> + /* wake 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);
> + }
> +
> + return 0;
> +}
> +
> static struct exynos_drm_manager_ops fimd_manager_ops = {
> .dpms = fimd_dpms,
> .mode_fixup = fimd_mode_fixup,
> @@ -846,6 +1002,7 @@ 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 = {
> @@ -856,26 +1013,40 @@ 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;
> }
> @@ -936,12 +1107,32 @@ 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;
>
> + if (of_property_read_bool(dev->of_node, "vidout-i80-ldi")) {
> + 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;
> + ctx->vidcon0 |= VIDCON0_DSI_EN;
> +
> + spin_lock_init(&ctx->win_updated_lock);
> + }
> +
> + 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");
> @@ -960,7 +1151,8 @@ static int fimd_probe(struct platform_device *pdev)
> if (IS_ERR(ctx->regs))
> return PTR_ERR(ctx->regs);
>
> - 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");
> return -ENXIO;
> @@ -973,7 +1165,6 @@ static int fimd_probe(struct platform_device *pdev)
> return ret;
> }
>
> - 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)
>
> --
> 1.7.9.5
>
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