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From:   =?UTF-8?q?Yannick=20Fertr=C3=A9?= <yannick.fertre@st.com>
To:     Yannick Fertre <yannick.fertre@st.com>,
        Philippe Cornu <philippe.cornu@st.com>,
        Benjamin Gaignard <benjamin.gaignard@st.com>,
        Vincent Abriou <vincent.abriou@st.com>,
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        Daniel Vetter <daniel@ffwll.ch>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre Torgue <alexandre.torgue@st.com>,
        <dri-devel@lists.freedesktop.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH v2] drm/stm: ltdc: remove clk_round_rate comment
Date:   Mon, 13 May 2019 15:15:18 +0200
Message-ID: <1557753318-11218-1-git-send-email-yannick.fertre@st.com>
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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@st.com>
---
Changes in v2:
	- Clk_enable & clk_disable are needed for the SOC STM32F7
	 (not for STM32MP1). I return this part of the patch to make sure the
	 driver is compatible with all SOC STM32.

 drivers/gpu/drm/stm/ltdc.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 97912e2..1104e78 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -507,11 +507,6 @@ 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);
@@ -521,6 +516,9 @@ static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc,

 	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