Hi Ajay,
On 03/19/2014 03:22 PM, Ajay Kumar wrote:
> Exynos variants support post pocessors(PP) for FIMD (MDNIE and IELCD)
> which work closely with fimd. These post processors have strict
> dependency on FIMD for poweron/poweroff. This patch adds an
> infrastructure in FIMD driver to accomodate such devices.
>
> Added structure definition for FIMD PP and interfaces from FIMD
> driver to control FIMD PP.
>
> Signed-off-by: Ajay Kumar <ajaykumar.rs@xxxxxxxxxxx>
> Signed-off-by: Shirish S <s.shirish@xxxxxxxxxxx>
> Signed-off-by: Rahul Sharma <rahul.sharma@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/exynos/exynos_drm_fimd.c | 162 +++++++++++++++++++++++++++++++
> drivers/gpu/drm/exynos/exynos_fimd_pp.h | 52 ++++++++++
> include/video/samsung_fimd.h | 6 +-
> 3 files changed, 219 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/exynos/exynos_fimd_pp.h
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> index a5511be..a584d8e 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> @@ -30,6 +30,7 @@
> #include "exynos_drm_fbdev.h"
> #include "exynos_drm_crtc.h"
> #include "exynos_drm_iommu.h"
> +#include "exynos_fimd_pp.h"
>
> /*
> * FIMD stands for Fully Interactive Mobile Display and
> @@ -113,11 +114,14 @@ struct fimd_context {
> void __iomem *regs;
> struct drm_display_mode mode;
> struct fimd_win_data win_data[WINDOWS_NR];
> + struct list_head fimd_pp_list;
> unsigned int default_win;
> unsigned long irq_flags;
> u32 vidcon0;
> u32 vidcon1;
> bool suspended;
> + bool enable_pp;
> + bool pp_running;
> int pipe;
> wait_queue_head_t wait_vsync_queue;
> atomic_t wait_vsync_event;
> @@ -145,6 +149,12 @@ static inline struct fimd_driver_data *drm_fimd_get_driver_data(
> return (struct fimd_driver_data *)of_id->data;
> }
>
> +void fimd_add_pp_to_list(struct fimd_context *ctx,
> + struct exynos_fimd_pp *pp)
> +{
> + list_add_tail(&pp->list, &ctx->fimd_pp_list);
> +}
> +
> static int fimd_mgr_initialize(struct exynos_drm_manager *mgr,
> struct drm_device *drm_dev)
> {
> @@ -214,17 +224,49 @@ static void fimd_mode_set(struct exynos_drm_manager *mgr,
> const struct drm_display_mode *in_mode)
> {
> struct fimd_context *ctx = mgr->ctx;
> + struct exynos_fimd_pp *pp_display;
>
> drm_mode_copy(&ctx->mode, in_mode);
> +
> + /* mode_set for the post processors*/
> + list_for_each_entry(pp_display, &ctx->fimd_pp_list, list)
> + if (pp_display->ops->mode_set)
> + pp_display->ops->mode_set(pp_display->ctx, in_mode);
> +}
> +
> +static int fimd_wait_till_per_frame_off(struct fimd_context *ctx)
> +{
> + unsigned int val = readl(ctx->regs + VIDCON0);
> + int count = 10;
> +
> + val &= ~(VIDCON0_ENVID_F);
> + writel(val, ctx->regs + VIDCON0);
> +
> + while (count) {
> + val = readl(ctx->regs + VIDCON0);
> + if ((val & VIDCON0_ENVID_F) == 0)
> + break;
> + mdelay(17);
Do we really need mdelay here? This function is not called in atomic
context, is it?
> + count--;
> + }
> +
> + if (count == 0) {
> + DRM_ERROR("FIMD per frame switch off TIMEDOUT\n");
> + return -ETIMEDOUT;
> + }
> +
> + return 0;
> }
Have you tried to use interrupts/completion instead of busy-waiting
approach?
>
> static void fimd_commit(struct exynos_drm_manager *mgr)
> {
> struct fimd_context *ctx = mgr->ctx;
> struct drm_display_mode *mode = &ctx->mode;
> + struct exynos_fimd_pp *pp_display;
> struct fimd_driver_data *driver_data;
> u32 val, clkdiv, vidcon1;
> int hblank, vblank, vsync_len, vbpd, vfpd, hsync_len, hbpd, hfpd;
> + int ret = 0;
>
> driver_data = ctx->driver_data;
> if (ctx->suspended)
> @@ -234,6 +276,30 @@ static void fimd_commit(struct exynos_drm_manager *mgr)
> if (mode->htotal == 0 || mode->vtotal == 0)
> return;
>
> + /* The FIMD and the post processor(PP) poweroff calls below are needed
> + * here to make sure that fimd_commit doesn't switch on the PPs twice
> + * in a row. For proper working we need to keep fimd, and the PPs
> + * off, before we start again. This flag "pp_running" will also help
> + * in syncing any of the clock enable/disable calls in PP routines.
> + */
> + if (ctx->enable_pp && ctx->pp_running) {
> + if (fimd_wait_till_per_frame_off(ctx))
> + DRM_ERROR("failed to switch off fimd per frame\n");
> + list_for_each_entry_reverse(pp_display, &ctx->fimd_pp_list,
> + list) {
> + if (pp_display->ops->power_off) {
> + ret = pp_display->ops->
> + power_off(pp_display->ctx);
> + if (ret) {
> + DRM_ERROR("fimd_pp switch off fail\n");
> + ctx->enable_pp = false;
Resetting enable_pp on power ops failures prevents disabling
DP_MDNIE_CLKCON clock on fimd power off.
> + } else {
> + ctx->pp_running = false;
> + }
> + }
> + }
> + }
> +
By the way, content of this big conditional maps easily to crtc and
encoder/bridge callbacks:
fimd_wait_till_per_frame_off: could be in drm_crtc_helper_funcs::prepare
power_off: could be in drm_(encoder|bridge)_helper_funcs::disable
It is just another argument for looking for common interface to
implement such blocks in more generic way, now we will have
drm_encoder, drm_bridge and exynos_fimd_pp implementing very similar
interfaces.
> /* setup polarity values */
> vidcon1 = ctx->vidcon1;
> if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> @@ -286,10 +352,34 @@ static void fimd_commit(struct exynos_drm_manager *mgr)
> else
> val &= ~VIDCON0_CLKDIR; /* 1:1 clock */
>
> + writel(val, ctx->regs + VIDCON0);
> +
> + if (ctx->enable_pp && !ctx->pp_running) {
> + /* set VCLK Free run control */
> + val = readl(ctx->regs + VIDCON0);
> + val |= VIDCON0_VCLKFREE;
> + writel(val, ctx->regs + VIDCON0);
> +
> + /* post processor setup and poweron*/
> + list_for_each_entry(pp_display, &ctx->fimd_pp_list, list) {
> + if (pp_display->ops->power_on) {
> + ret = pp_display->ops->
> + power_on(pp_display->ctx);
> + if (ret) {
> + DRM_ERROR("fimd_pp poweron failed\n");
> + ctx->enable_pp = false;
> + } else {
> + ctx->pp_running = true;
> + }
> + }
> + }
> + }
> +
The same comment applies here.
> /*
> * fields of register with prefix '_F' would be updated
> * at vsync(same as dma start)
> */
> + val = readl(ctx->regs + VIDCON0);
> val |= VIDCON0_ENVID | VIDCON0_ENVID_F;
> writel(val, ctx->regs + VIDCON0);
> }
> @@ -749,6 +839,9 @@ static int fimd_poweron(struct exynos_drm_manager *mgr)
> goto lcd_clk_err;
> }
>
> + if (ctx->enable_pp)
> + writel(MDNIE_CLK_ENABLE, ctx->regs + DP_MDNIE_CLKCON);
> +
Name suggests that enable_pp field is for whole post-processing and
MDNIE_CLK_ENABLE is MDNIE specific, it seems to be incorrect.
> /* if vblank was enabled status, enable it again. */
> if (test_and_clear_bit(0, &ctx->irq_flags)) {
> ret = fimd_enable_vblank(mgr);
> @@ -776,6 +869,9 @@ bus_clk_err:
> static int fimd_poweroff(struct exynos_drm_manager *mgr)
> {
> struct fimd_context *ctx = mgr->ctx;
> + struct exynos_fimd_pp *pp_display;
> + int ret = 0;
> +
>
> if (ctx->suspended)
> return 0;
> @@ -787,6 +883,27 @@ static int fimd_poweroff(struct exynos_drm_manager *mgr)
> */
> fimd_window_suspend(mgr);
>
> + if (ctx->enable_pp && ctx->pp_running) {
> + if (fimd_wait_till_per_frame_off(ctx))
> + DRM_ERROR("failed to switch off fimd per frame\n");
> + list_for_each_entry_reverse(pp_display, &ctx->fimd_pp_list,
> + list) {
> + if (pp_display->ops->power_off) {
> + ret = pp_display->ops->
> + power_off(pp_display->ctx);
> + if (ret) {
> + DRM_ERROR("fimd_pp switch off fail\n");
> + ctx->enable_pp = false;
> + } else {
> + ctx->pp_running = false;
> + }
> + }
> + }
> + }
The same loop again, separate function could be used instead.
> +
> + if (ctx->enable_pp)
> + writel(0, ctx->regs + DP_MDNIE_CLKCON);
> +
Again, mixing different level of abstraction.
> clk_disable_unprepare(ctx->lcd_clk);
> clk_disable_unprepare(ctx->bus_clk);
>
> @@ -815,6 +932,47 @@ static void fimd_dpms(struct exynos_drm_manager *mgr, int mode)
> }
> }
>
> +static int fimd_set_property(void *in_ctx, struct drm_property *property,
> + uint64_t val)
> +{
> + struct fimd_context *ctx = in_ctx;
> + struct exynos_fimd_pp *pp_display;
> + int ret;
> +
> + list_for_each_entry(pp_display, &ctx->fimd_pp_list, list) {
> + if (pp_display->ops->set_property) {
> + ret = pp_display->ops->set_property(ctx->drm_dev,
> + pp_display->ctx, property, val);
> + if (ret) {
> + DRM_ERROR("pp set_property failed.\n");
> + return ret;
> + }
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int fimd_set_gamma(void *in_ctx, u16 *r, u16 *g, u16 *b,
> + uint32_t start, uint32_t size)
> +{
> + struct fimd_context *ctx = in_ctx;
> + struct exynos_fimd_pp *pp_display;
> + int ret;
> +
> + list_for_each_entry(pp_display, &ctx->fimd_pp_list, list) {
> + if (pp_display->ops->set_property)
s/property/gamma/;
> + ret = pp_display->ops->set_gamma(pp_display->ctx,
> + r, g, b, start, size);
> + if (ret) {
> + DRM_ERROR("pp set_gamma failed.\n");
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> static struct exynos_drm_manager_ops fimd_manager_ops = {
> .dpms = fimd_dpms,
> .mode_fixup = fimd_mode_fixup,
> @@ -826,6 +984,8 @@ 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,
> + .set_property = fimd_set_property,
> + .set_gamma = fimd_set_gamma,
> };
.set_property and .set_gamma fields are not present in
exynos_drm_manager_ops in exynos-drm-next-todo branch, I guess some
patches are missing.
>
> static struct exynos_drm_manager fimd_manager = {
> @@ -919,6 +1079,8 @@ static int fimd_bind(struct device *dev, struct device *master, void *data)
> init_waitqueue_head(&ctx->wait_vsync_queue);
> atomic_set(&ctx->wait_vsync_event, 0);
>
> + INIT_LIST_HEAD(&ctx->fimd_pp_list);
> +
> platform_set_drvdata(pdev, &fimd_manager);
>
> fimd_manager.ctx = ctx;
> diff --git a/drivers/gpu/drm/exynos/exynos_fimd_pp.h b/drivers/gpu/drm/exynos/exynos_fimd_pp.h
> new file mode 100644
> index 0000000..528d3cb
> --- /dev/null
> +++ b/drivers/gpu/drm/exynos/exynos_fimd_pp.h
> @@ -0,0 +1,52 @@
> +/* drivers/gpu/drm/exynos/exynos_fimd_pp.h
> + *
> + * Copyright (C) 2014 Samsung Electronics Co.Ltd
> + *
> + * Header file for FIMD post processors.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2 of the License, or (at your
> + * option) any later version.
> + *
> + */
> +
> +#ifndef __EXYNOS_FIMD_H__
> +#define __EXYNOS_FIMD_H__
> +
> +#include <drm/exynos_drm.h>
> +
> +/**
> + * Post Processor interfaces structure for DRM based FIMD.
> + *
> + * @power_on: setup the post processor.
> + * @power_off: power off the post processor.
> + * @mode_set: set video timings if needed by the post processor.
> + * @set_property: use crtc properties to set the post processor.
> + * @set_gamma: set gamma properties to post processor.
> + *
> + */
> +struct exynos_fimd_pp_ops {
> + int (*power_on)(void *pp_ctx);
> + int (*power_off)(void *pp_ctx);
> + void (*mode_set)(void *pp_ctx, const struct drm_display_mode *in_mode);
> + int (*set_property)(struct drm_device *drm_dev, void *pp_ctx,
> + struct drm_property *property, uint64_t val);
I wonder if it would not be better to use drm_crtc instead of drm_device
here, it seems to be more consistent with drm_crtc_funcs:set_property.
Regards
Andrzej
> + int (*set_gamma)(void *pp_ctx, u16 *r,
> + u16 *g, u16 *b, uint32_t start, uint32_t size);
> +};
> +
> +/*
> + * Exynos FIMD post processor structure
> + * @list: the list entry
> + * @ops: pointer to callbacks for post processor specific functionality
> + * @ctx: A pointer to the post processor's implementation specific context
> + *
> + */
> +struct exynos_fimd_pp {
> + struct list_head list;
> + struct exynos_fimd_pp_ops *ops;
> + void *ctx;
> +};
> +
> +#endif
> diff --git a/include/video/samsung_fimd.h b/include/video/samsung_fimd.h
> index b039320..3ff7cad 100644
> --- a/include/video/samsung_fimd.h
> +++ b/include/video/samsung_fimd.h
> @@ -60,7 +60,7 @@
> #define VIDCON0_CLKVAL_F_SHIFT 6
> #define VIDCON0_CLKVAL_F_LIMIT 0xff
> #define VIDCON0_CLKVAL_F(_x) ((_x) << 6)
> -#define VIDCON0_VLCKFREE (1 << 5)
> +#define VIDCON0_VCLKFREE (1 << 5)
> #define VIDCON0_CLKDIR (1 << 4)
>
> #define VIDCON0_CLKSEL_MASK (0x3 << 2)
> @@ -435,6 +435,10 @@
> #define BLENDCON_NEW_8BIT_ALPHA_VALUE (1 << 0)
> #define BLENDCON_NEW_4BIT_ALPHA_VALUE (0 << 0)
>
> +/* DP_MDNIE_CLKCON */
> +#define DP_MDNIE_CLKCON 0x27c
> +#define MDNIE_CLK_ENABLE 0x3
> +
> /* Notes on per-window bpp settings
> *
> * Value Win0 Win1 Win2 Win3 Win 4
>
--
To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
