Re: [PATCH 10/21] drm: mxsfb: Stop using DRM simple display pipeline helper

On 2020-03-09 20:52, Laurent Pinchart wrote:

The DRM simple display pipeline helper only supports a single plane. In order to prepare for support of the alpha plane on i.MX6SX and i.MX7, move away from the helper. No new feature is added.

Signed-off-by: Laurent Pinchart laurent.pinchart@ideasonboard.com

I actually would prefer if we order this patch a bit later, especially after the mxsfb_crtc -> mxsfb_kms rename. It will make git log -p easier later.

Looks quite straight forward otherwise. One small comment below.

---

drivers/gpu/drm/mxsfb/mxsfb_crtc.c | 184 ++++++++++++++++++++++++++--- drivers/gpu/drm/mxsfb/mxsfb_drv.c | 108 ++--------------- drivers/gpu/drm/mxsfb/mxsfb_drv.h | 23 ++-- 3 files changed, 197 insertions(+), 118 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c index c4f1575b4210..8f339adb8d04 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c @@ -9,15 +9,21 @@ */

#include <linux/clk.h> +#include <linux/io.h> #include <linux/iopoll.h> +#include <linux/pm_runtime.h> #include <linux/spinlock.h>

+#include <drm/drm_atomic.h> +#include <drm/drm_atomic_helper.h> #include <drm/drm_bridge.h> #include <drm/drm_crtc.h> +#include <drm/drm_encoder.h> #include <drm/drm_fb_cma_helper.h> #include <drm/drm_fourcc.h> #include <drm/drm_gem_cma_helper.h> -#include <drm/drm_simple_kms_helper.h> +#include <drm/drm_plane.h> +#include <drm/drm_plane_helper.h> #include <drm/drm_vblank.h>

#include "mxsfb_drv.h" @@ -26,6 +32,10 @@ /* 1 second delay should be plenty of time for block reset */ #define RESET_TIMEOUT 1000000

+/*

• • CRTC
• */

static u32 set_hsync_pulse_width(struct mxsfb_drm_private *mxsfb, u32 val) { return (val & mxsfb->devdata->hs_wdth_mask) << @@ -35,9 +45,8 @@ static u32 set_hsync_pulse_width(struct mxsfb_drm_private *mxsfb, u32 val) /* Setup the MXSFB registers for decoding the pixels out of the framebuffer */ static int mxsfb_set_pixel_fmt(struct mxsfb_drm_private *mxsfb) {

• struct drm_crtc *crtc = &mxsfb->pipe.crtc;
• struct drm_device *drm = crtc->dev;
• const u32 format = crtc->primary->state->fb->format->format;

• struct drm_device *drm = mxsfb->drm;

• const u32 format = mxsfb->crtc.primary->state->fb->format->format; u32 ctrl, ctrl1;

  ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER;

@@ -71,8 +80,7 @@ static int mxsfb_set_pixel_fmt(struct mxsfb_drm_private *mxsfb)

static void mxsfb_set_bus_fmt(struct mxsfb_drm_private *mxsfb) {

• struct drm_crtc *crtc = &mxsfb->pipe.crtc;
• struct drm_device *drm = crtc->dev;

• struct drm_device *drm = mxsfb->drm; u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; u32 reg;

@@ -175,7 +183,7 @@ static int mxsfb_reset_block(struct mxsfb_drm_private *mxsfb)

static dma_addr_t mxsfb_get_fb_paddr(struct mxsfb_drm_private *mxsfb) {

• struct drm_framebuffer *fb = mxsfb->pipe.plane.state->fb;

• struct drm_framebuffer *fb = mxsfb->plane.state->fb; struct drm_gem_cma_object *gem;

  if (!fb)

@@ -190,8 +198,8 @@ static dma_addr_t mxsfb_get_fb_paddr(struct mxsfb_drm_private *mxsfb)

static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb) {

• struct drm_device *drm = mxsfb->pipe.crtc.dev;
• struct drm_display_mode *m = &mxsfb->pipe.crtc.state->adjusted_mode;

• struct drm_device *drm = mxsfb->crtc.dev;
• struct drm_display_mode *m = &mxsfb->crtc.state->adjusted_mode; u32 bus_flags = mxsfb->connector->display_info.bus_flags; u32 vdctrl0, vsync_pulse_len, hsync_pulse_len; int err;

@@ -273,10 +281,29 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb) mxsfb->base + LCDC_VDCTRL4); }

-void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb) +static int mxsfb_crtc_atomic_check(struct drm_crtc *crtc,

• 		   struct drm_crtc_state *state)
  

{

• bool has_primary = state->plane_mask &

• 	   drm_plane_mask(crtc->primary);
  

• /* The primary plane has to be enabled when the CRTC is active. */
• if (has_primary != state->active)

• return -EINVAL;
  

• /* TODO: Is this needed ? */

Did you come to a conclusion? I guess since drm_simple_kms_crtc_check() is using it is the safe choice to keep it.

-- Stefan

• return drm_atomic_add_affected_planes(state->state, crtc);

+}

+static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,

• 		     struct drm_crtc_state *old_state)
  

+{

• struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev);

• struct drm_device *drm = mxsfb->drm; dma_addr_t paddr;

• pm_runtime_get_sync(drm->dev);

• mxsfb_enable_axi_clk(mxsfb); mxsfb_crtc_mode_set_nofb(mxsfb);

@@ -290,17 +317,100 @@ void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb) mxsfb_enable_controller(mxsfb); }

-void mxsfb_crtc_disable(struct mxsfb_drm_private *mxsfb) +static void mxsfb_crtc_atomic_disable(struct drm_crtc *crtc,

• 		      struct drm_crtc_state *old_state)
  

{

• struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev);
• struct drm_device *drm = mxsfb->drm;
• struct drm_pending_vblank_event *event;
• mxsfb_disable_controller(mxsfb); mxsfb_disable_axi_clk(mxsfb);
• pm_runtime_put_sync(drm->dev);
• spin_lock_irq(&drm->event_lock);
• event = crtc->state->event;
• if (event) {

• crtc->state->event = NULL;
  

• drm_crtc_send_vblank_event(crtc, event);
  

• }
• spin_unlock_irq(&drm->event_lock);

+}

+static int mxsfb_crtc_enable_vblank(struct drm_crtc *crtc) +{

• struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev);
• /* Clear and enable VBLANK IRQ */
• mxsfb_enable_axi_clk(mxsfb);
• writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
• writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
• mxsfb_disable_axi_clk(mxsfb);
• return 0;

+}

+static void mxsfb_crtc_disable_vblank(struct drm_crtc *crtc) +{

• struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev);
• /* Disable and clear VBLANK IRQ */
• mxsfb_enable_axi_clk(mxsfb);
• writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
• writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
• mxsfb_disable_axi_clk(mxsfb);

+}

+static const struct drm_crtc_helper_funcs mxsfb_crtc_helper_funcs = {

• .atomic_check = mxsfb_crtc_atomic_check,
• .atomic_enable = mxsfb_crtc_atomic_enable,
• .atomic_disable = mxsfb_crtc_atomic_disable,

+};

+static const struct drm_crtc_funcs mxsfb_crtc_funcs = {

• .reset = drm_atomic_helper_crtc_reset,
• .destroy = drm_crtc_cleanup,
• .set_config = drm_atomic_helper_set_config,
• .page_flip = drm_atomic_helper_page_flip,
• .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
• .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
• .enable_vblank = mxsfb_crtc_enable_vblank,
• .disable_vblank = mxsfb_crtc_disable_vblank,

+};

+/*

• • Encoder
• */

+static const struct drm_encoder_funcs mxsfb_encoder_funcs = {

• .destroy = drm_encoder_cleanup,

+};

+/*

• • Planes
• */

+static int mxsfb_plane_atomic_check(struct drm_plane *plane,

• 		    struct drm_plane_state *plane_state)
  

+{

• struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev);
• struct drm_crtc_state *crtc_state;
• crtc_state = drm_atomic_get_new_crtc_state(plane_state->state,

• 				   &mxsfb->crtc);
  

• return drm_atomic_helper_check_plane_state(plane_state, crtc_state,

• 				   DRM_PLANE_HELPER_NO_SCALING,
  

• 				   DRM_PLANE_HELPER_NO_SCALING,
  

• 				   false, true);
  

}

-void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,

• 	       struct drm_plane_state *state)
  

+static void mxsfb_plane_atomic_update(struct drm_plane *plane,

• 		      struct drm_plane_state *old_pstate)
  

{

• struct drm_simple_display_pipe *pipe = &mxsfb->pipe;
• struct drm_crtc *crtc = &pipe->crtc;

• struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev);
• struct drm_crtc *crtc = &mxsfb->crtc; struct drm_pending_vblank_event *event; dma_addr_t paddr;

@@ -324,3 +434,47 @@ void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb, mxsfb_disable_axi_clk(mxsfb); } }

+static const struct drm_plane_helper_funcs mxsfb_plane_helper_funcs = {

• .atomic_check = mxsfb_plane_atomic_check,
• .atomic_update = mxsfb_plane_atomic_update,

+};

+static const struct drm_plane_funcs mxsfb_plane_funcs = {

• .update_plane = drm_atomic_helper_update_plane,
• .disable_plane = drm_atomic_helper_disable_plane,
• .destroy = drm_plane_cleanup,
• .reset = drm_atomic_helper_plane_reset,
• .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
• .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,

+};

+static const uint32_t mxsfb_formats[] = {

• DRM_FORMAT_XRGB8888,
• DRM_FORMAT_RGB565

+};

+int mxsfb_kms_init(struct mxsfb_drm_private *mxsfb) +{

• struct drm_encoder *encoder = &mxsfb->encoder;
• struct drm_plane *plane = &mxsfb->plane;
• struct drm_crtc *crtc = &mxsfb->crtc;
• int ret;
• drm_plane_helper_add(plane, &mxsfb_plane_helper_funcs);
• ret = drm_universal_plane_init(mxsfb->drm, plane, 0, &mxsfb_plane_funcs,

• 		       mxsfb_formats, ARRAY_SIZE(mxsfb_formats),
  

• 		       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
  

• if (ret)

• return ret;
  

• drm_crtc_helper_add(crtc, &mxsfb_crtc_helper_funcs);
• ret = drm_crtc_init_with_planes(mxsfb->drm, crtc, plane, NULL,

• 			&mxsfb_crtc_funcs, NULL);
  

• if (ret)

• return ret;
  

• encoder->possible_crtcs = drm_crtc_mask(crtc);
• return drm_encoder_init(mxsfb->drm, encoder, &mxsfb_encoder_funcs,

• 		DRM_MODE_ENCODER_NONE, NULL);
  

+} diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c index 204c1e52e9aa..a8da92976d13 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c @@ -10,22 +10,23 @@

#include <linux/clk.h> #include <linux/dma-mapping.h> +#include <linux/io.h> #include <linux/module.h> #include <linux/of_device.h> +#include <linux/platform_device.h> #include <linux/pm_runtime.h> -#include <linux/spinlock.h>

-#include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> -#include <drm/drm_crtc.h> +#include <drm/drm_bridge.h> +#include <drm/drm_connector.h> #include <drm/drm_drv.h> #include <drm/drm_fb_helper.h> #include <drm/drm_gem_cma_helper.h> #include <drm/drm_gem_framebuffer_helper.h> #include <drm/drm_irq.h> +#include <drm/drm_mode_config.h> #include <drm/drm_of.h> #include <drm/drm_probe_helper.h> -#include <drm/drm_simple_kms_helper.h> #include <drm/drm_vblank.h>

#include "mxsfb_drv.h" @@ -57,17 +58,6 @@ static const struct mxsfb_devdata mxsfb_devdata[] = { }, };

-static const uint32_t mxsfb_formats[] = {

• DRM_FORMAT_XRGB8888,
• DRM_FORMAT_RGB565

-};

-static struct mxsfb_drm_private * -drm_pipe_to_mxsfb_drm_private(struct drm_simple_display_pipe *pipe) -{

• return container_of(pipe, struct mxsfb_drm_private, pipe);

-}

void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb) { if (mxsfb->clk_axi) @@ -90,77 +80,6 @@ static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = { .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, };

-static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,

• 	      struct drm_crtc_state *crtc_state,
  

• 	      struct drm_plane_state *plane_state)
  

-{

• struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
• struct drm_device *drm = pipe->plane.dev;
• pm_runtime_get_sync(drm->dev);
• mxsfb_crtc_enable(mxsfb);

-}

-static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe) -{

• struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
• struct drm_device *drm = pipe->plane.dev;
• struct drm_crtc *crtc = &pipe->crtc;
• struct drm_pending_vblank_event *event;
• mxsfb_crtc_disable(mxsfb);
• pm_runtime_put_sync(drm->dev);
• spin_lock_irq(&drm->event_lock);
• event = crtc->state->event;
• if (event) {

• crtc->state->event = NULL;
  

• drm_crtc_send_vblank_event(crtc, event);
  

• }
• spin_unlock_irq(&drm->event_lock);

-}

-static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,

• 	      struct drm_plane_state *plane_state)
  

-{

• struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
• mxsfb_plane_atomic_update(mxsfb, plane_state);

-}

-static int mxsfb_pipe_enable_vblank(struct drm_simple_display_pipe *pipe) -{

• struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
• /* Clear and enable VBLANK IRQ */
• mxsfb_enable_axi_clk(mxsfb);
• writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
• writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
• mxsfb_disable_axi_clk(mxsfb);
• return 0;

-}

-static void mxsfb_pipe_disable_vblank(struct drm_simple_display_pipe *pipe) -{

• struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
• /* Disable and clear VBLANK IRQ */
• mxsfb_enable_axi_clk(mxsfb);
• writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
• writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
• mxsfb_disable_axi_clk(mxsfb);

-}

-static struct drm_simple_display_pipe_funcs mxsfb_funcs = {

• .enable = mxsfb_pipe_enable,
• .disable = mxsfb_pipe_disable,
• .update = mxsfb_pipe_update,
• .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
• .enable_vblank = mxsfb_pipe_enable_vblank,
• .disable_vblank = mxsfb_pipe_disable_vblank,

-};

static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb) { struct drm_device *drm = mxsfb->drm; @@ -183,7 +102,7 @@ static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb) if (!bridge) return -ENODEV;

• ret = drm_simple_display_pipe_attach_bridge(&mxsfb->pipe, bridge);

• ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0); if (ret) { DRM_DEV_ERROR(drm->dev, "failed to attach bridge: %d\n", ret);

@@ -250,10 +169,9 @@ static int mxsfb_load(struct drm_device *drm, unsigned long flags) /* Modeset init */ drm_mode_config_init(drm);

• ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,

• 	mxsfb_formats, ARRAY_SIZE(mxsfb_formats), NULL, NULL);
  

• ret = mxsfb_kms_init(mxsfb); if (ret < 0) {

• dev_err(drm->dev, "Cannot setup simple display pipe\n");
  

• dev_err(drm->dev, "Failed to initialize KMS pipeline\n");
  

  goto err_vblank; }

@@ -309,11 +227,11 @@ static void mxsfb_unload(struct drm_device *drm) pm_runtime_disable(drm->dev); }

-static void mxsfb_irq_preinstall(struct drm_device *drm) +static void mxsfb_irq_disable(struct drm_device *drm) { struct mxsfb_drm_private *mxsfb = drm->dev_private;

• mxsfb_pipe_disable_vblank(&mxsfb->pipe);

• mxsfb->crtc.funcs->disable_vblank(&mxsfb->crtc);

}

static irqreturn_t mxsfb_irq_handler(int irq, void *data) @@ -327,7 +245,7 @@ static irqreturn_t mxsfb_irq_handler(int irq, void *data) reg = readl(mxsfb->base + LCDC_CTRL1);

if (reg & CTRL1_CUR_FRAME_DONE_IRQ)

• drm_crtc_handle_vblank(&mxsfb->pipe.crtc);
  

• drm_crtc_handle_vblank(&mxsfb->crtc);
  
  

  writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);

@@ -341,8 +259,8 @@ DEFINE_DRM_GEM_CMA_FOPS(fops); static struct drm_driver mxsfb_driver = { .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, .irq_handler = mxsfb_irq_handler,

• .irq_preinstall = mxsfb_irq_preinstall,
• .irq_uninstall = mxsfb_irq_preinstall,

• .irq_preinstall = mxsfb_irq_disable,
• .irq_uninstall = mxsfb_irq_disable, .gem_free_object_unlocked = drm_gem_cma_free_object, .gem_vm_ops = &drm_gem_cma_vm_ops, .dumb_create = drm_gem_cma_dumb_create,

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.h b/drivers/gpu/drm/mxsfb/mxsfb_drv.h index 0e3e5a63bbf9..edd766ad254f 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.h +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.h @@ -8,7 +8,12 @@ #ifndef __MXSFB_DRV_H__ #define __MXSFB_DRV_H__

-struct drm_device; +#include <drm/drm_crtc.h> +#include <drm/drm_device.h> +#include <drm/drm_encoder.h> +#include <drm/drm_plane.h>

+struct clk;

struct mxsfb_devdata { unsigned int transfer_count; @@ -29,20 +34,22 @@ struct mxsfb_drm_private { struct clk *clk_disp_axi;

struct drm_device *drm;

• struct drm_simple_display_pipe pipe;

• struct drm_plane plane;
• struct drm_crtc crtc;
• struct drm_encoder encoder; struct drm_connector *connector; struct drm_bridge *bridge;

};

-int mxsfb_setup_crtc(struct drm_device *dev); -int mxsfb_create_output(struct drm_device *dev); +static inline struct mxsfb_drm_private * +to_mxsfb_drm_private(struct drm_device *drm) +{

• return drm->dev_private;

+}

void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb); void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb);

-void mxsfb_crtc_enable(struct mxsfb_drm_private *mxsfb); -void mxsfb_crtc_disable(struct mxsfb_drm_private *mxsfb); -void mxsfb_plane_atomic_update(struct mxsfb_drm_private *mxsfb,

• 	       struct drm_plane_state *state);
  

+int mxsfb_kms_init(struct mxsfb_drm_private *mxsfb);

#endif /* __MXSFB_DRV_H__ */