From patchwork Thu Jul 13 13:17:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 13312185 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AC030C001E0 for ; Thu, 13 Jul 2023 13:17:37 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7935210E6D8; Thu, 13 Jul 2023 13:17:30 +0000 (UTC) Received: from michel.telenet-ops.be (michel.telenet-ops.be [IPv6:2a02:1800:110:4::f00:18]) by gabe.freedesktop.org (Postfix) with ESMTPS id 30E6D10E6D7 for ; Thu, 13 Jul 2023 13:17:26 +0000 (UTC) Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed40:6264:77e5:42e2:477d]) by michel.telenet-ops.be with bizsmtp id LdHN2A00d3wy6xv06dHNae; Thu, 13 Jul 2023 15:17:23 +0200 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtp (Exim 4.95) (envelope-from ) id 1qJwC3-001GrC-48; Thu, 13 Jul 2023 15:17:22 +0200 Received: from geert by rox.of.borg with local (Exim 4.95) (envelope-from ) id 1qJwCA-00GWyv-QU; Thu, 13 Jul 2023 15:17:22 +0200 From: Geert Uytterhoeven To: Javier Martinez Canillas , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter Subject: [PATCH 7/8] drm/fb-helper: Add support for DRM_FORMAT_R1 Date: Thu, 13 Jul 2023 15:17:15 +0200 Message-Id: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Geert Uytterhoeven , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add support for the monochrome light-on-dark buffer format (R1) to the fb helper, so this format can be used for fbdev emulation and for the text console. This avoids the overhead of using XR24 and the associated conversions on display hardware that supports only a simple monochrome format. R1 is very similar to C1 (monochrome indexed color), and shares the same depth and bpp. As drm_mode_legacy_fb_format() returns a format based on only depth and bpp, it cannot distinguish between R1 and C1. Hence drm_fb_helper_find_format() is modified to try to fall back to R1 if C1 is not supported. Signed-off-by: Geert Uytterhoeven Reviewed-by: Javier Martinez Canillas --- drivers/gpu/drm/drm_fb_helper.c | 41 ++++++++++++++++++++++++--------- 1 file changed, 30 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index e870b2ce7a8625e3..1f1bfa764b6b9f00 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1130,7 +1130,7 @@ static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var, { u8 depth = format->depth; - if (format->is_color_indexed) { + if (format->format == DRM_FORMAT_R1 || format->is_color_indexed) { var->red.offset = 0; var->green.offset = 0; var->blue.offset = 0; @@ -1236,6 +1236,7 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var, case DRM_FORMAT_C1: case DRM_FORMAT_C2: case DRM_FORMAT_C4: + case DRM_FORMAT_R1: /* supported format with sub-byte pixels */ break; @@ -1439,12 +1440,24 @@ int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, } EXPORT_SYMBOL(drm_fb_helper_pan_display); +static bool is_supported_format(uint32_t format, const uint32_t *formats, + size_t format_count) +{ + size_t i; + + for (i = 0; i < format_count; ++i) { + if (formats[i] == format) + return true; + } + + return false; +} + static uint32_t drm_fb_helper_find_format(struct drm_fb_helper *fb_helper, const uint32_t *formats, size_t format_count, uint32_t bpp, uint32_t depth) { struct drm_device *dev = fb_helper->dev; uint32_t format; - size_t i; /* * Do not consider YUV or other complicated formats @@ -1457,10 +1470,12 @@ static uint32_t drm_fb_helper_find_format(struct drm_fb_helper *fb_helper, const if (!format) goto err; - for (i = 0; i < format_count; ++i) { - if (formats[i] == format) - return format; - } + if (is_supported_format(format, formats, format_count)) + return format; + + if (format == DRM_FORMAT_C1 && + is_supported_format(DRM_FORMAT_R1, formats, format_count)) + return DRM_FORMAT_R1; err: /* We found nothing. */ @@ -1680,11 +1695,15 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper) } static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, - bool is_color_indexed) + const struct drm_format_info *format) { info->fix.type = FB_TYPE_PACKED_PIXELS; - info->fix.visual = is_color_indexed ? FB_VISUAL_PSEUDOCOLOR - : FB_VISUAL_TRUECOLOR; + if (format->format == DRM_FORMAT_R1) + info->fix.visual = FB_VISUAL_MONO10; + else if (format->is_color_indexed) + info->fix.visual = FB_VISUAL_PSEUDOCOLOR; + else + info->fix.visual = FB_VISUAL_TRUECOLOR; info->fix.mmio_start = 0; info->fix.mmio_len = 0; info->fix.type_aux = 0; @@ -1707,6 +1726,7 @@ static void drm_fb_helper_fill_var(struct fb_info *info, case DRM_FORMAT_C1: case DRM_FORMAT_C2: case DRM_FORMAT_C4: + case DRM_FORMAT_R1: /* supported format with sub-byte pixels */ break; @@ -1747,8 +1767,7 @@ void drm_fb_helper_fill_info(struct fb_info *info, { struct drm_framebuffer *fb = fb_helper->fb; - drm_fb_helper_fill_fix(info, fb->pitches[0], - fb->format->is_color_indexed); + drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format); drm_fb_helper_fill_var(info, fb_helper, sizes->fb_width, sizes->fb_height);