linux-kernel - [PATCH v2 2/2] drm/edid: Refactor DisplayID timing block structs

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Message-ID: <20250214010545.3793736-1-sdoregor@sdore.me>
Date: Fri, 14 Feb 2025 04:05:45 +0300
From: Egor Vorontsov <sdoregor@...re.me>
To: linux-kernel@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Egor Vorontsov <sdoregor@...re.me>
Subject: [PATCH v2 2/2] drm/edid: Refactor DisplayID timing block structs

Using le16 instead of u8[2].
Replaced an error with a printed warning as well.

Suggested-by: Jani Nikula <jani.nikula@...ux.intel.com>
Signed-off-by: Egor Vorontsov <sdoregor@...re.me>
---
 drivers/gpu/drm/drm_displayid_internal.h | 22 ++++++++--------
 drivers/gpu/drm/drm_edid.c               | 32 ++++++++++++------------
 2 files changed, 27 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/drm_displayid_internal.h b/drivers/gpu/drm/drm_displayid_internal.h
index 88220c107822..957dd0619f5c 100644
--- a/drivers/gpu/drm/drm_displayid_internal.h
+++ b/drivers/gpu/drm/drm_displayid_internal.h
@@ -115,25 +115,25 @@ struct displayid_tiled_block {
 struct displayid_detailed_timings_1 {
 	u8 pixel_clock[3];
 	u8 flags;
-	u8 hactive[2];
-	u8 hblank[2];
-	u8 hsync[2];
-	u8 hsw[2];
-	u8 vactive[2];
-	u8 vblank[2];
-	u8 vsync[2];
-	u8 vsw[2];
+	__le16 hactive;
+	__le16 hblank;
+	__le16 hsync;
+	__le16 hsw;
+	__le16 vactive;
+	__le16 vblank;
+	__le16 vsync;
+	__le16 vsw;
 } __packed;
 
 struct displayid_detailed_timing_block {
 	struct displayid_block base;
 	struct displayid_detailed_timings_1 timings[];
-};
+} __packed;
 
 struct displayid_formula_timings_9 {
 	u8 flags;
-	__be16 hactive;
-	__be16 vactive;
+	__le16 hactive;
+	__le16 vactive;
 	u8 vrefresh;
 } __packed;
 
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 9c363df5af9a..54122a12a24f 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -6764,19 +6764,19 @@ static struct drm_display_mode *drm_mode_displayid_detailed(struct drm_device *d
 							    bool type_7)
 {
 	struct drm_display_mode *mode;
-	unsigned pixel_clock = (timings->pixel_clock[0] |
-				(timings->pixel_clock[1] << 8) |
-				(timings->pixel_clock[2] << 16)) + 1;
-	unsigned hactive = (timings->hactive[0] | timings->hactive[1] << 8) + 1;
-	unsigned hblank = (timings->hblank[0] | timings->hblank[1] << 8) + 1;
-	unsigned hsync = (timings->hsync[0] | (timings->hsync[1] & 0x7f) << 8) + 1;
-	unsigned hsync_width = (timings->hsw[0] | timings->hsw[1] << 8) + 1;
-	unsigned vactive = (timings->vactive[0] | timings->vactive[1] << 8) + 1;
-	unsigned vblank = (timings->vblank[0] | timings->vblank[1] << 8) + 1;
-	unsigned vsync = (timings->vsync[0] | (timings->vsync[1] & 0x7f) << 8) + 1;
-	unsigned vsync_width = (timings->vsw[0] | timings->vsw[1] << 8) + 1;
-	bool hsync_positive = (timings->hsync[1] >> 7) & 0x1;
-	bool vsync_positive = (timings->vsync[1] >> 7) & 0x1;
+	unsigned int pixel_clock = (timings->pixel_clock[0] |
+				    (timings->pixel_clock[1] << 8) |
+				    (timings->pixel_clock[2] << 16)) + 1;
+	unsigned int hactive = le16_to_cpu(timings->hactive) + 1;
+	unsigned int hblank = le16_to_cpu(timings->hblank) + 1;
+	unsigned int hsync = (le16_to_cpu(timings->hsync) & 0x7fff) + 1;
+	unsigned int hsync_width = le16_to_cpu(timings->hsw) + 1;
+	unsigned int vactive = le16_to_cpu(timings->vactive) + 1;
+	unsigned int vblank = le16_to_cpu(timings->vblank) + 1;
+	unsigned int vsync = (le16_to_cpu(timings->vsync) & 0x7fff) + 1;
+	unsigned int vsync_width = le16_to_cpu(timings->vsw) + 1;
+	bool hsync_positive = le16_to_cpu(timings->hsync) & (1 << 15);
+	bool vsync_positive = le16_to_cpu(timings->vsync) & (1 << 15);
 
 	mode = drm_mode_create(dev);
 	if (!mode)
@@ -6838,8 +6838,8 @@ static struct drm_display_mode *drm_mode_displayid_formula(struct drm_device *de
 							   bool type_10)
 {
 	struct drm_display_mode *mode;
-	u16 hactive = be16_to_cpu(timings->hactive) + 1;
-	u16 vactive = be16_to_cpu(timings->vactive) + 1;
+	u16 hactive = le16_to_cpu(timings->hactive) + 1;
+	u16 vactive = le16_to_cpu(timings->vactive) + 1;
 	u8 timing_formula = timings->flags & 0x7;
 
 	/* TODO: support RB-v2 & RB-v3 */
@@ -6848,7 +6848,7 @@ static struct drm_display_mode *drm_mode_displayid_formula(struct drm_device *de
 
 	/* TODO: support video-optimized refresh rate */
 	if (timings->flags & (1 << 4))
-		return NULL;
+		drm_dbg_kms(dev, "Fractional vrefresh is not implemented, proceeding with non-video-optimized refresh rate");
 
 	mode = drm_cvt_mode(dev, hactive, vactive, timings->vrefresh + 1, timing_formula == 1, false, false);
 	if (!mode)
-- 
2.48.0