From nobody Fri Sep 20 15:25:53 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9EBD9C001DC for ; Thu, 27 Jul 2023 09:47:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231997AbjG0JrK (ORCPT ); Thu, 27 Jul 2023 05:47:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60552 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232692AbjG0Jqt (ORCPT ); Thu, 27 Jul 2023 05:46:49 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0AC209B for ; Thu, 27 Jul 2023 02:46:43 -0700 (PDT) Received: from IcarusMOD.eternityproject.eu (2-237-20-237.ip236.fastwebnet.it [2.237.20.237]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: kholk11) by madras.collabora.co.uk (Postfix) with ESMTPSA id 247C66607136; Thu, 27 Jul 2023 10:46:41 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1690451201; bh=JI4lc9a8QXR5NBTwDSozQ6dg2sDhEor4ZM5gg2fngeU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PnfsL2E1I/wOk2GWMINDAp4nFlkIVPoaOW9ZHJVz5BLZNVijBod/CqaaLgFcMYciG nxQ3x9weoOFqdLoC/RUPd2O+K/913vFUb9Ioj/x2uxm0m0Ce+x2moudVhm3xs5AZEi IgIs3tgwSpW+fgB7QF/1KYz+Q8mrj6XELTjGwsxQB3FUkyhd62H5EgBupWiR1hT+OR odKwadKxG4FBASFQE6K5G0nmjOa7NSQTvY3CI7ZaW/mO/xKZG44W9IpXef4vO4L0D9 UxYMrVDS4f/10iG8+V275KAi6kEFiRLKZH/kE7LFGoKtkagpWQ2puXJCG2H39rJa0m OAfofmpoqb4lQ== From: AngeloGioacchino Del Regno To: chunkuang.hu@kernel.org Cc: p.zabel@pengutronix.de, airlied@gmail.com, daniel@ffwll.ch, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, wenst@chromium.org, kernel@collabora.com, ehristev@collabora.com, "Jason-JH . Lin" Subject: [PATCH RESEND v6 04/11] drm/mediatek: gamma: Improve and simplify HW LUT calculation Date: Thu, 27 Jul 2023 11:46:26 +0200 Message-ID: <20230727094633.22505-5-angelogioacchino.delregno@collabora.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230727094633.22505-1-angelogioacchino.delregno@collabora.com> References: <20230727094633.22505-1-angelogioacchino.delregno@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Use drm_color_lut_extract() to avoid open-coding the bits reduction calculations for each color channel and use a struct drm_color_lut to temporarily store the information instead of an array of u32. Also, slightly improve the precision of the HW LUT calculation in the LUT DIFF case by performing the subtractions on the 16-bits values and doing the 10 bits conversion later. Signed-off-by: AngeloGioacchino Del Regno Reviewed-by: Jason-JH.Lin Reviewed-by: Alexandre Mergnat --- drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 30 +++++++++++++++-------- 1 file changed, 20 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c b/drivers/gpu/drm/me= diatek/mtk_disp_gamma.c index b25ba209e7a4..204a1aa7bfc9 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c @@ -77,7 +77,6 @@ void mtk_gamma_set_common(struct device *dev, void __iome= m *regs, struct drm_crt bool lut_diff; u16 lut_size; u32 word; - u32 diff[3] =3D {0}; =20 /* If there's no gamma lut there's nothing to do here. */ if (!state->gamma_lut) @@ -97,18 +96,29 @@ void mtk_gamma_set_common(struct device *dev, void __io= mem *regs, struct drm_crt lut_base =3D regs + DISP_GAMMA_LUT; lut =3D (struct drm_color_lut *)state->gamma_lut->data; for (i =3D 0; i < lut_size; i++) { + struct drm_color_lut diff, hwlut; + + hwlut.red =3D drm_color_lut_extract(lut[i].red, 10); + hwlut.green =3D drm_color_lut_extract(lut[i].green, 10); + hwlut.blue =3D drm_color_lut_extract(lut[i].blue, 10); + if (!lut_diff || (i % 2 =3D=3D 0)) { - word =3D (((lut[i].red >> 6) & LUT_10BIT_MASK) << 20) + - (((lut[i].green >> 6) & LUT_10BIT_MASK) << 10) + - ((lut[i].blue >> 6) & LUT_10BIT_MASK); + word =3D hwlut.red << 20 + + hwlut.green << 10 + + hwlut.red; } else { - diff[0] =3D (lut[i].red >> 6) - (lut[i - 1].red >> 6); - diff[1] =3D (lut[i].green >> 6) - (lut[i - 1].green >> 6); - diff[2] =3D (lut[i].blue >> 6) - (lut[i - 1].blue >> 6); + diff.red =3D lut[i].red - lut[i - 1].red; + diff.red =3D drm_color_lut_extract(diff.red, 10); + + diff.green =3D lut[i].green - lut[i - 1].green; + diff.green =3D drm_color_lut_extract(diff.green, 10); + + diff.blue =3D lut[i].blue - lut[i - 1].blue; + diff.blue =3D drm_color_lut_extract(diff.blue, 10); =20 - word =3D ((diff[0] & LUT_10BIT_MASK) << 20) + - ((diff[1] & LUT_10BIT_MASK) << 10) + - (diff[2] & LUT_10BIT_MASK); + word =3D diff.blue << 20 + + diff.green << 10 + + diff.red; } writel(word, (lut_base + i * 4)); } --=20 2.40.1