[PATCH] drm/stm: ltdc: add user update info in plane print state

[Philippe Cornu]

This patch adds the user update information in
frames-per-second into the drm debugfs plane state.

Signed-off-by: Philippe Cornu <philippe.co...@st.com>
---
 drivers/gpu/drm/stm/ltdc.c | 22 ++++++++++++++++++++++
 drivers/gpu/drm/stm/ltdc.h |  8 ++++++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 2b745cfc9000..061d2b6e5157 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -729,6 +729,8 @@ static void ltdc_plane_atomic_update(struct drm_plane 
*plane,
        reg_update_bits(ldev->regs, LTDC_L1CR + lofs,
                        LXCR_LEN | LXCR_CLUTEN, val);
 
+       ldev->plane_fpsi[plane->index].counter++;
+
        mutex_lock(&ldev->err_lock);
        if (ldev->error_status & ISR_FUIF) {
                DRM_DEBUG_DRIVER("Fifo underrun\n");
@@ -754,6 +756,25 @@ static void ltdc_plane_atomic_disable(struct drm_plane 
*plane,
                         oldstate->crtc->base.id, plane->base.id);
 }
 
+static void ltdc_plane_atomic_print_state(struct drm_printer *p,
+                                         const struct drm_plane_state *state)
+{
+       struct drm_plane *plane = state->plane;
+       struct ltdc_device *ldev = plane_to_ltdc(plane);
+       struct fps_info *fpsi = &ldev->plane_fpsi[plane->index];
+       int ms_since_last;
+       ktime_t now;
+
+       now = ktime_get();
+       ms_since_last = ktime_to_ms(ktime_sub(now, fpsi->last_timestamp));
+
+       drm_printf(p, "\tuser_updates=%dfps\n",
+                  DIV_ROUND_CLOSEST(fpsi->counter * 1000, ms_since_last));
+
+       fpsi->last_timestamp = now;
+       fpsi->counter = 0;
+}
+
 static const struct drm_plane_funcs ltdc_plane_funcs = {
        .update_plane = drm_atomic_helper_update_plane,
        .disable_plane = drm_atomic_helper_disable_plane,
@@ -761,6 +782,7 @@ static const struct drm_plane_funcs ltdc_plane_funcs = {
        .reset = drm_atomic_helper_plane_reset,
        .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
        .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+       .atomic_print_state = ltdc_plane_atomic_print_state,
 };
 
 static const struct drm_plane_helper_funcs ltdc_plane_helper_funcs = {
diff --git a/drivers/gpu/drm/stm/ltdc.h b/drivers/gpu/drm/stm/ltdc.h
index 61a80d00bc3b..1e16d6afb0d2 100644
--- a/drivers/gpu/drm/stm/ltdc.h
+++ b/drivers/gpu/drm/stm/ltdc.h
@@ -20,6 +20,13 @@ struct ltdc_caps {
        bool non_alpha_only_l1; /* non-native no-alpha formats on layer 1 */
 };
 
+#define LTDC_MAX_LAYER 4
+
+struct fps_info {
+       unsigned int counter;
+       ktime_t last_timestamp;
+};
+
 struct ltdc_device {
        void __iomem *regs;
        struct clk *pixel_clk;  /* lcd pixel clock */
@@ -27,6 +34,7 @@ struct ltdc_device {
        struct ltdc_caps caps;
        u32 error_status;
        u32 irq_status;
+       struct fps_info plane_fpsi[LTDC_MAX_LAYER];
 };
 
 int ltdc_load(struct drm_device *ddev);
-- 
2.15.1

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