linux-kernel - Re: [PATCH 3/3] drm/stm: dsi: provide the implementation of mode

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Date:   Tue, 4 Jan 2022 12:01:37 +0100
From:   Philippe CORNU <philippe.cornu@...s.st.com>
To:     Antonio Borneo <antonio.borneo@...s.st.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Yannick Fertre <yannick.fertre@...s.st.com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] drm/stm: dsi: provide the implementation of
 mode_valid()



On 12/18/21 10:50 PM, Antonio Borneo wrote:
> The dsi has several constraints on the video modes it can support,
> mainly due to the frequencies that can be generated by the PLL
> integrated in the DSI device.
> 
> Verify that the required HS clock can be generated by the PLL.
> 
> The dsi clock from the dsi PLL and the ltdc pixel clock are
> asynchronous. The dsi needs to return in LP mode during HFP or HBP
> to re-synchronize at each video line.
> 
> Verify that the duration of HFP and HBP allows the dsi to enter in
> LP mode.
> 
> Signed-off-by: Antonio Borneo <antonio.borneo@...s.st.com>
> ---
> To: David Airlie <airlied@...ux.ie>
> To: Daniel Vetter <daniel@...ll.ch>
> To: Andrzej Hajda <a.hajda@...sung.com>
> To: Neil Armstrong <narmstrong@...libre.com>
> To: Robert Foss <robert.foss@...aro.org>
> To: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
> To: Jonas Karlman <jonas@...boo.se>
> To: Jernej Skrabec <jernej.skrabec@...il.com>
> To: Yannick Fertre <yannick.fertre@...s.st.com>
> To: Philippe Cornu <philippe.cornu@...s.st.com>
> To: Benjamin Gaignard <benjamin.gaignard@...aro.org>
> To: Maxime Coquelin <mcoquelin.stm32@...il.com>
> To: Alexandre Torgue <alexandre.torgue@...s.st.com>
> To: Philipp Zabel <p.zabel@...gutronix.de>
> To: dri-devel@...ts.freedesktop.org
> To: linux-stm32@...md-mailman.stormreply.com
> To: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
>   drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 98 +++++++++++++++++++++++++++
>   1 file changed, 98 insertions(+)

Hi Antonio,
many thanks for your patch.
Nice improvement for better filtering supported modes...
Acked-by: Philippe Cornu <philippe.cornu@...s.st.com>
Reviewed-by: Philippe Cornu <philippe.cornu@...s.st.com>
Philippe :-)