On 13.06.2023 13:15, Marek Szyprowski wrote:
> On 05.05.2023 13:25, Maxime Ripard wrote:
>> From: Stephen Boyd <sb...@kernel.org>
>>
>> We'll need to turn the code in clk_mux_determine_rate_flags() to deal
>> with CLK_SET_RATE_NO_REPARENT into a helper clock drivers will be able
>> to use if they don't want to allow reparenting.
>>
>> Cc: Abel Vesa <abelv...@kernel.org>
>> Cc: Alessandro Zummo <a.zu...@towertech.it>
>> Cc: Alexandre Belloni <alexandre.bell...@bootlin.com>
>> Cc: Alexandre Torgue <alexandre.tor...@foss.st.com>
>> Cc: "Andreas Färber" <afaer...@suse.de>
>> Cc: AngeloGioacchino Del Regno <angelogioacchino.delre...@collabora.com>
>> Cc: Baolin Wang <baolin.w...@linux.alibaba.com>
>> Cc: Charles Keepax <ckee...@opensource.cirrus.com>
>> Cc: Chen-Yu Tsai <w...@csie.org>
>> Cc: Chen-Yu Tsai <we...@chromium.org>
>> Cc: Chunyan Zhang <zhang.l...@gmail.com>
>> Cc: Claudiu Beznea <claudiu.bez...@microchip.com>
>> Cc: Daniel Vetter <dan...@ffwll.ch>
>> Cc: David Airlie <airl...@gmail.com>
>> Cc: David Lechner <da...@lechnology.com>
>> Cc: Dinh Nguyen <dingu...@kernel.org>
>> Cc: Fabio Estevam <feste...@gmail.com>
>> Cc: Geert Uytterhoeven <geert+rene...@glider.be>
>> Cc: Jaroslav Kysela <pe...@perex.cz>
>> Cc: Jernej Skrabec <jernej.skra...@gmail.com>
>> Cc: Jonathan Hunter <jonath...@nvidia.com>
>> Cc: Kishon Vijay Abraham I <kis...@kernel.org>
>> Cc: Liam Girdwood <lgirdw...@gmail.com>
>> Cc: Linus Walleij <linus.wall...@linaro.org>
>> Cc: Luca Ceresoli <luca.ceres...@bootlin.com>
>> Cc: Manivannan Sadhasivam <m...@kernel.org>
>> Cc: Mark Brown <broo...@kernel.org>
>> Cc: Markus Schneider-Pargmann <m...@baylibre.com>
>> Cc: Max Filippov <jcmvb...@gmail.com>
>> Cc: Maxime Coquelin <mcoquelin.st...@gmail.com>
>> Cc: Mikko Perttunen <mperttu...@nvidia.com>
>> Cc: Miles Chen <miles.c...@mediatek.com>
>> Cc: Nicolas Ferre <nicolas.fe...@microchip.com>
>> Cc: Orson Zhai <orsonz...@gmail.com>
>> Cc: Paul Cercueil <p...@crapouillou.net>
>> Cc: Peng Fan <peng....@nxp.com>
>> Cc: Peter De Schrijver <pdeschrij...@nvidia.com>
>> Cc: Prashant Gaikwad <pgaik...@nvidia.com>
>> Cc: Richard Fitzgerald <r...@opensource.cirrus.com>
>> Cc: Samuel Holland <sam...@sholland.org>
>> Cc: Sascha Hauer <s.ha...@pengutronix.de>
>> Cc: Sekhar Nori <nsek...@ti.com>
>> Cc: Shawn Guo <shawn...@kernel.org>
>> Cc: Takashi Iwai <ti...@suse.com>
>> Cc: Thierry Reding <thierry.red...@gmail.com>
>> Cc: Ulf Hansson <ulf.hans...@linaro.org>
>> Cc: Vinod Koul <vk...@kernel.org>
>> Cc: dri-devel@lists.freedesktop.org
>> Cc: linux-acti...@lists.infradead.org
>> Cc: linux-arm-ker...@lists.infradead.org
>> Cc: linux-m...@vger.kernel.org
>> Cc: linux-...@lists.infradead.org
>> Cc: linux-renesas-...@vger.kernel.org
>> Cc: linux-...@vger.kernel.org
>> Cc: linux-st...@st-md-mailman.stormreply.com
>> Cc: linux-su...@lists.linux.dev
>> Cc: linux-te...@vger.kernel.org
>> Cc: NXP Linux Team <linux-...@nxp.com>
>> Cc: patc...@opensource.cirrus.com
>> Cc: Pengutronix Kernel Team <ker...@pengutronix.de>
>> Signed-off-by: Stephen Boyd <sb...@kernel.org>
>> Signed-off-by: Maxime Ripard <max...@cerno.tech>
>> ---
>
> This patch landed in today's linux-next as commit 1b4e99fda73f ("clk:
> Move no reparent case into a separate function"). Unfortunately it
> causes serious regression of some of my test boards. Namely Exynos3250
> based boards are so slow after it, that my test scripts fail with a
> timeout waiting for them to finish booting. I will try to debug this
> later in the evening to check what has happened that some clocks got
> very low rate.
>
I just got a few spare minutes, so I decided to take a look into this
issue. The following change fixed my problem:
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index ffc9f03840b7..7ac9f7a8cb84 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -629,6 +629,7 @@ clk_core_determine_rate_no_reparent(struct clk_hw *hw,
best = clk_core_get_rate_nolock(core);
}
+ req->best_parent_rate = best;
req->rate = best;
return 0;
best_parent_rate is still being used somewhere in the code and needs to
be updated regardless of the CLK_SET_RATE_NO_REPARENT flag.
> ...
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
