From patchwork Tue May 21 10:13:42 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 798081 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 58C4778C6D; Tue, 21 May 2024 10:14:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716286458; cv=none; b=R02r+U9TJbxc3XdzR+Slb8lRRHadYjYHMqEp7KTRDzNRRB3rW0iO5tqWEZj6vFNHKmA1/d/Z8vzxjFTtC++Jkvcv+imdsxoX5maIvHmMqw/1QNNSnEDP/y/18PtfrliatantZDOjo0yx/lEvARwkcVy2U7JV6magoGEcyR9FPh4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716286458; c=relaxed/simple; bh=MbjlKvUpIH4Kpzei6mLsDD4DvZW2edzJFxhrN620Y6I=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=j+AVr3P9Mm7QQMNlmZ9lxKLD4xQca5+VuunnpjHPllwEjQtPLzT3EaqV5hTQ/e4VJgw9ScfGyTZ201VSxpAT5Qw5XkJsrJtXowKbQaJ7KYAMgRyDlqW6DyqB8Qv51wndps/sb3YYWUgGSRDiPfvUGOv/E7R8srC0DEcXRYH19FI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bQ+QhRXj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bQ+QhRXj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 82DF4C32782; Tue, 21 May 2024 10:14:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1716286457; bh=MbjlKvUpIH4Kpzei6mLsDD4DvZW2edzJFxhrN620Y6I=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=bQ+QhRXjETRBMEW1Jixis+IvCqstdfj17kby0ee2viFGOlHb07Ez7aOSAHCK6VPxm duML0z7lRgNDskcQPc4XS2gzqmJnh71w/tdnyNYvLSAYiCTmH92OmWVCLa+IT6SUHB Jqj4zdDRVBt734vqSPCbaVyWPRD5sH9aBG/v9TCh8cOioMjKnOx439ZOkPrYcNEcKZ Ufnn1/F2Mni3ZghifFPrD2CbqzMJiquZhZv7Ero7XYKMwUELY4WNVsYVlEFYRKwfsx Ge3McauaxhU/G6MrcumRuHePIvQGKBPP6Q+Vxhyl8hkH1KJGUmhKaqRTNF6m15nGCZ TtyaVgGVs1FTw== From: Maxime Ripard Date: Tue, 21 May 2024 12:13:42 +0200 Subject: [PATCH v14 09/28] drm/display: hdmi: Add HDMI compute clock helper Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240521-kms-hdmi-connector-state-v14-9-51950db4fedb@kernel.org> References: <20240521-kms-hdmi-connector-state-v14-0-51950db4fedb@kernel.org> In-Reply-To: <20240521-kms-hdmi-connector-state-v14-0-51950db4fedb@kernel.org> To: Maarten Lankhorst , Thomas Zimmermann , David Airlie , Daniel Vetter , Jonathan Corbet , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Andy Yan Cc: Hans Verkuil , Sebastian Wick , =?utf-8?b?VmlsbGUgU3lyasOkbMOk?= , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-sunxi@lists.linux.dev, Maxime Ripard , Dave Stevenson X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3352; i=mripard@kernel.org; h=from:subject:message-id; bh=MbjlKvUpIH4Kpzei6mLsDD4DvZW2edzJFxhrN620Y6I=; b=owGbwMvMwCmsHn9OcpHtvjLG02pJDGk+xVce/5rGJZLqaKihpxgosKHLUeT2XAfVpfOsXY9+z HwQH1TaMZWFQZiTQVZMkeWJTNjp5e2LqxzsV/6AmcPKBDKEgYtTACZiWM7YcDrDRVbq9pojwSX+ M4XkX07qnyZbtDq+s3/75/tGUgzfLJxFRYSyzmR9vN3ZWbUuvLqNsWH/VPOfGl5/Oz8zp9jHz55 a21C9d4/Hrlm2xbYyZfc9BXcd29J7613z5GPfglzmMjlNUQQA X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D A lot of HDMI drivers have some variation of the formula to calculate the TMDS character rate from a mode, but few of them actually take all parameters into account. Let's create a helper to provide that rate taking all parameters into account. Reviewed-by: Dave Stevenson Signed-off-by: Maxime Ripard --- drivers/gpu/drm/display/drm_hdmi_helper.c | 57 +++++++++++++++++++++++++++++++ include/drm/display/drm_hdmi_helper.h | 4 +++ 2 files changed, 61 insertions(+) diff --git a/drivers/gpu/drm/display/drm_hdmi_helper.c b/drivers/gpu/drm/display/drm_hdmi_helper.c index faf5e9efa7d3..679eb3e81393 100644 --- a/drivers/gpu/drm/display/drm_hdmi_helper.c +++ b/drivers/gpu/drm/display/drm_hdmi_helper.c @@ -193,5 +193,62 @@ void drm_hdmi_avi_infoframe_content_type(struct hdmi_avi_infoframe *frame, } frame->itc = conn_state->content_type != DRM_MODE_CONTENT_TYPE_NO_DATA; } EXPORT_SYMBOL(drm_hdmi_avi_infoframe_content_type); + +/** + * drm_hdmi_compute_mode_clock() - Computes the TMDS Character Rate + * @mode: Display mode to compute the clock for + * @bpc: Bits per character + * @fmt: Output Pixel Format used + * + * Returns the TMDS Character Rate for a given mode, bpc count and output format. + * + * RETURNS: + * The TMDS Character Rate, in Hertz, or 0 on error. + */ +unsigned long long +drm_hdmi_compute_mode_clock(const struct drm_display_mode *mode, + unsigned int bpc, enum hdmi_colorspace fmt) +{ + unsigned long long clock = mode->clock * 1000ULL; + unsigned int vic = drm_match_cea_mode(mode); + + /* + * CTA-861-G Spec, section 5.4 - Color Coding and Quantization + * mandates that VIC 1 always uses 8 bpc. + */ + if (vic == 1 && bpc != 8) + return 0; + + if (fmt == HDMI_COLORSPACE_YUV422) { + /* + * HDMI 1.4b Spec, section 6.2.3 - Pixel Encoding Requirements + * specifies that YUV422 is 36-bit only. + */ + if (bpc != 12) + return 0; + + /* + * HDMI 1.0 Spec, section 6.5 - Pixel Encoding + * specifies that YUV422 requires two 12-bits components per + * pixel clock, which is equivalent in our calculation to three + * 8-bits components + */ + bpc = 8; + } + + /* + * HDMI 2.0 Spec, Section 7.1 - YCbCr 4:2:0 Pixel Encoding + * specifies that YUV420 encoding is carried at a TMDS Character Rate + * equal to half the pixel clock rate. + */ + if (fmt == HDMI_COLORSPACE_YUV420) + clock = clock / 2; + + if (mode->flags & DRM_MODE_FLAG_DBLCLK) + clock = clock * 2; + + return DIV_ROUND_CLOSEST_ULL(clock * bpc, 8); +} +EXPORT_SYMBOL(drm_hdmi_compute_mode_clock); diff --git a/include/drm/display/drm_hdmi_helper.h b/include/drm/display/drm_hdmi_helper.h index 76d234826e22..57e3b18c15ec 100644 --- a/include/drm/display/drm_hdmi_helper.h +++ b/include/drm/display/drm_hdmi_helper.h @@ -22,6 +22,10 @@ drm_hdmi_infoframe_set_hdr_metadata(struct hdmi_drm_infoframe *frame, const struct drm_connector_state *conn_state); void drm_hdmi_avi_infoframe_content_type(struct hdmi_avi_infoframe *frame, const struct drm_connector_state *conn_state); +unsigned long long +drm_hdmi_compute_mode_clock(const struct drm_display_mode *mode, + unsigned int bpc, enum hdmi_colorspace fmt); + #endif