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mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=nicolas.frattaroli@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1763556090; s=zohomail; d=collabora.com; i=nicolas.frattaroli@collabora.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-ID:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Content-Type:Message-Id:Reply-To; bh=qkp5pM4kPUn4Z6RS327lCOqrGmM6PpBeTOuTvzIeNwc=; b=Hvyo7taZPEolTW7Q7dLQLL/uX2K0MI7p7QAQJLQEAbXYw5eFq6ofNe5beUBpEd12 1/y0p4GyB6eSbpZp5CYbpjl3VeOiXJWyQF07RqM8SnEM91fxbYGFwkvPO+vEcfw7E6J EjXEYgUF2NAl6dXlaOaFH32IGvWQZQLMQ964umEE= Received: by mx.zohomail.com with SMTPS id 1763556087174897.1379263947298; Wed, 19 Nov 2025 04:41:27 -0800 (PST) From: Nicolas Frattaroli To: Maxime Ripard Cc: Harry Wentland , Leo Li , Rodrigo Siqueira , Alex Deucher , Christian =?UTF-8?B?S8O2bmln?= , David Airlie , Simona Vetter , Maarten Lankhorst , Thomas Zimmermann , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Sandy Huang , Heiko =?UTF-8?B?U3TDvGJuZXI=?= , Andy Yan , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , kernel@collabora.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org Subject: Re: [PATCH v4 07/10] drm/display: hdmi-state-helper: Act on color format DRM property Date: Wed, 19 Nov 2025 13:41:18 +0100 Message-ID: <7179523.lOV4Wx5bFT@workhorse> In-Reply-To: <4wt5dbvseauo2bvi66ohtk445zsfjtpjwgvochwwlyk4uugcmy@5ubwtkxyy2ax> References: <20251117-color-format-v4-0-0ded72bd1b00@collabora.com> <20251117-color-format-v4-7-0ded72bd1b00@collabora.com> <4wt5dbvseauo2bvi66ohtk445zsfjtpjwgvochwwlyk4uugcmy@5ubwtkxyy2ax> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251119_044209_948707_1DAEEBB1 X-CRM114-Status: GOOD ( 23.41 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wednesday, 19 November 2025 10:09:12 Central European Standard Time Maxime Ripard wrote: > Hi, > > On Mon, Nov 17, 2025 at 08:11:51PM +0100, Nicolas Frattaroli wrote: > > With the introduction of the "color format" DRM property, which allows > > userspace to request a specific color format, the HDMI state helper > > should implement this. > > > > Implement it by checking whether the property is set and set to > > something other than auto. If so, pass the requested color format, and > > otherwise set RGB. > > > > Signed-off-by: Nicolas Frattaroli > > --- > > drivers/gpu/drm/display/drm_hdmi_state_helper.c | 8 +++++++- > > 1 file changed, 7 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c > > index a561f124be99..add0d51fce33 100644 > > --- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c > > +++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c > > @@ -650,9 +650,15 @@ hdmi_compute_config(const struct drm_connector *connector, > > conn_state->max_bpc, > > 8, connector->max_bpc); > > int ret; > > + enum hdmi_colorspace hdmi_colorspace; > > + > > + if (conn_state->color_format && conn_state->color_format != DRM_COLOR_FORMAT_AUTO) > > + hdmi_colorspace = color_format_to_hdmi_colorspace(conn_state->color_format); > > + else > > + hdmi_colorspace = HDMI_COLORSPACE_RGB; > > > > ret = hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc, > > - HDMI_COLORSPACE_RGB); > > + hdmi_colorspace); > > I don't think we want the fallback to yuv420 for anything but auto, so Okay. Changing all the non-hdmi-state-helper drivers (amdgpu, i915) to do this as well would require some more work however, especially in the case of amdgpu where the code flow is not always obvious. > I'd rather have something like > > if (conn_state->color_format != DRM_COLOR_FORMAT_AUTO) > return hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc, > color_format_to_hdmi_colorspace(conn_state->color_format)) > > We'll also need unit tests. Sure, am I guessing correctly that they'd go in drm_hdmi_state_helper_test.c? > Maxime >