linux-kernel - [PATCH] drm/stm: ltdc: remove call of pm-runtime functions

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Message-ID: <20200701120402.6444-1-yannick.fertre@st.com>
Date:   Wed, 1 Jul 2020 14:04:02 +0200
From:   Yannick Fertre <yannick.fertre@...com>
To:     Yannick Fertre <yannick.fertre@...com>,
        Philippe Cornu <philippe.cornu@...com>,
        Benjamin Gaignard <benjamin.gaignard@...com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm/stm: ltdc: remove call of pm-runtime functions

It is not necessary to suspend or stop the ltdc clocks
to modify the pixel clock.

Signed-off-by: Yannick Fertre <yannick.fertre@...com>
---
 drivers/gpu/drm/stm/ltdc.c | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 3f590d916e91..6e28f707092f 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -506,15 +506,7 @@ static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc,
 				 struct drm_display_mode *adjusted_mode)
 {
 	struct ltdc_device *ldev = crtc_to_ltdc(crtc);
-	struct drm_device *ddev = crtc->dev;
 	int rate = mode->clock * 1000;
-	bool runtime_active;
-	int ret;
-
-	runtime_active = pm_runtime_active(ddev->dev);
-
-	if (runtime_active)
-		pm_runtime_put_sync(ddev->dev);
 
 	if (clk_set_rate(ldev->pixel_clk, rate) < 0) {
 		DRM_ERROR("Cannot set rate (%dHz) for pixel clk\n", rate);
@@ -523,14 +515,6 @@ static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc,
 
 	adjusted_mode->clock = clk_get_rate(ldev->pixel_clk) / 1000;
 
-	if (runtime_active) {
-		ret = pm_runtime_get_sync(ddev->dev);
-		if (ret) {
-			DRM_ERROR("Failed to fixup mode, cannot get sync\n");
-			return false;
-		}
-	}
-
 	DRM_DEBUG_DRIVER("requested clock %dkHz, adjusted clock %dkHz\n",
 			 mode->clock, adjusted_mode->clock);
 
-- 
2.17.1