linux-kernel - [PATCH] drm/stm: ltdc: remove clk_round

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Message-ID: <1557500600-19771-1-git-send-email-yannick.fertre@st.com>
Date:   Fri, 10 May 2019 17:03:20 +0200
From:   Yannick Fertré <yannick.fertre@...com>
To:     Yannick Fertre <yannick.fertre@...com>,
        Philippe Cornu <philippe.cornu@...com>,
        Benjamin Gaignard <benjamin.gaignard@...com>,
        Vincent Abriou <vincent.abriou@...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 clk_round_rate comment

Clk_round_rate returns rounded clock without changing
the hardware in any way.
This function couldn't replace set_rate/get_rate calls.
Todo comment has been removed & a new log inserted.

Signed-off-by: Yannick Fertré <yannick.fertre@...com>
---
 drivers/gpu/drm/stm/ltdc.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 97912e2..2f8aa2e 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -507,20 +507,16 @@ static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc,
 	struct ltdc_device *ldev = crtc_to_ltdc(crtc);
 	int rate = mode->clock * 1000;
 
-	/*
-	 * TODO clk_round_rate() does not work yet. When ready, it can
-	 * be used instead of clk_set_rate() then clk_get_rate().
-	 */
-
-	clk_disable(ldev->pixel_clk);
 	if (clk_set_rate(ldev->pixel_clk, rate) < 0) {
 		DRM_ERROR("Cannot set rate (%dHz) for pixel clk\n", rate);
 		return false;
 	}
-	clk_enable(ldev->pixel_clk);
 
 	adjusted_mode->clock = clk_get_rate(ldev->pixel_clk) / 1000;
 
+	DRM_DEBUG_DRIVER("requested clock %dkHz, adjusted clock %dkHz\n",
+			 mode->clock, adjusted_mode->clock);
+
 	return true;
 }
 
-- 
2.7.4