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

Reviewed-by: Vincent Abriou <vincent.abriou@st.com>

On 04/07/2018 11:35 PM, Philippe Cornu wrote:
> This patch adds the user update information in
> frames-per-second into the drm debugfs plane state.
>
> Signed-off-by: Philippe Cornu <philippe.cornu@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);
>
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