drm/edid: constify struct edid passed to detailed blocks

Constify the first level of struct edid in detailed timing parsing. Also
switch to struct edid instead of u8.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ec7acb8a9ee0e2868bbb2afdfdd7db114ae180e1.1648477901.git.jani.nikula@intel.com

1 files changed, 23 insertions, 25 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index e90dc6ed3498..f04e3d241c8d 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2352,38 +2352,37 @@ static bool is_detailed_timing_descriptor(const struct detailed_timing *descript
 typedef void detailed_cb(const struct detailed_timing *timing, void *closure);
 
 static void
-cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
+cea_for_each_detailed_block(const u8 *ext, detailed_cb *cb, void *closure)
 {
 	int i, n;
 	u8 d = ext[0x02];
-	u8 *det_base = ext + d;
+	const u8 *det_base = ext + d;
 
 	if (d < 4 || d > 127)
 		return;
 
 	n = (127 - d) / 18;
 	for (i = 0; i < n; i++)
-		cb((struct detailed_timing *)(det_base + 18 * i), closure);
+		cb((const struct detailed_timing *)(det_base + 18 * i), closure);
 }
 
 static void
-vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
+vtb_for_each_detailed_block(const u8 *ext, detailed_cb *cb, void *closure)
 {
 	unsigned int i, n = min((int)ext[0x02], 6);
-	u8 *det_base = ext + 5;
+	const u8 *det_base = ext + 5;
 
 	if (ext[0x01] != 1)
 		return; /* unknown version */
 
 	for (i = 0; i < n; i++)
-		cb((struct detailed_timing *)(det_base + 18 * i), closure);
+		cb((const struct detailed_timing *)(det_base + 18 * i), closure);
 }
 
 static void
-drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
+drm_for_each_detailed_block(const struct edid *edid, detailed_cb *cb, void *closure)
 {
 	int i;
-	struct edid *edid = (struct edid *)raw_edid;
 
 	if (edid == NULL)
 		return;
@@ -2391,8 +2390,8 @@ drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
 	for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
 		cb(&(edid->detailed_timings[i]), closure);
 
-	for (i = 1; i <= raw_edid[0x7e]; i++) {
-		u8 *ext = raw_edid + (i * EDID_LENGTH);
+	for (i = 1; i <= edid->extensions; i++) {
+		const u8 *ext = (const u8 *)edid + (i * EDID_LENGTH);
 
 		switch (*ext) {
 		case CEA_EXT:
@@ -2430,7 +2429,7 @@ drm_monitor_supports_rb(struct edid *edid)
 	if (edid->revision >= 4) {
 		bool ret = false;
 
-		drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
+		drm_for_each_detailed_block(edid, is_rb, &ret);
 		return ret;
 	}
 
@@ -2457,7 +2456,7 @@ drm_gtf2_hbreak(struct edid *edid)
 {
 	const struct detailed_timing *descriptor = NULL;
 
-	drm_for_each_detailed_block((u8 *)edid, find_gtf2, &descriptor);
+	drm_for_each_detailed_block(edid, find_gtf2, &descriptor);
 
 	BUILD_BUG_ON(offsetof(typeof(*descriptor), data.other_data.data.range.formula.gtf2.hfreq_start_khz) != 12);
 
@@ -2469,7 +2468,7 @@ drm_gtf2_2c(struct edid *edid)
 {
 	const struct detailed_timing *descriptor = NULL;
 
-	drm_for_each_detailed_block((u8 *)edid, find_gtf2, &descriptor);
+	drm_for_each_detailed_block(edid, find_gtf2, &descriptor);
 
 	BUILD_BUG_ON(offsetof(typeof(*descriptor), data.other_data.data.range.formula.gtf2.c) != 13);
 
@@ -2481,7 +2480,7 @@ drm_gtf2_m(struct edid *edid)
 {
 	const struct detailed_timing *descriptor = NULL;
 
-	drm_for_each_detailed_block((u8 *)edid, find_gtf2, &descriptor);
+	drm_for_each_detailed_block(edid, find_gtf2, &descriptor);
 
 	BUILD_BUG_ON(offsetof(typeof(*descriptor), data.other_data.data.range.formula.gtf2.m) != 14);
 
@@ -2493,7 +2492,7 @@ drm_gtf2_k(struct edid *edid)
 {
 	const struct detailed_timing *descriptor = NULL;
 
-	drm_for_each_detailed_block((u8 *)edid, find_gtf2, &descriptor);
+	drm_for_each_detailed_block(edid, find_gtf2, &descriptor);
 
 	BUILD_BUG_ON(offsetof(typeof(*descriptor), data.other_data.data.range.formula.gtf2.k) != 16);
 
@@ -2505,7 +2504,7 @@ drm_gtf2_2j(struct edid *edid)
 {
 	const struct detailed_timing *descriptor = NULL;
 
-	drm_for_each_detailed_block((u8 *)edid, find_gtf2, &descriptor);
+	drm_for_each_detailed_block(edid, find_gtf2, &descriptor);
 
 	BUILD_BUG_ON(offsetof(typeof(*descriptor), data.other_data.data.range.formula.gtf2.j) != 17);
 
@@ -3055,8 +3054,7 @@ add_inferred_modes(struct drm_connector *connector, struct edid *edid)
 	};
 
 	if (version_greater(edid, 1, 0))
-		drm_for_each_detailed_block((u8 *)edid, do_inferred_modes,
-					    &closure);
+		drm_for_each_detailed_block(edid, do_inferred_modes, &closure);
 
 	return closure.modes;
 }
@@ -3135,8 +3133,8 @@ add_established_modes(struct drm_connector *connector, struct edid *edid)
 	}
 
 	if (version_greater(edid, 1, 0))
-		    drm_for_each_detailed_block((u8 *)edid,
-						do_established_modes, &closure);
+		drm_for_each_detailed_block(edid, do_established_modes,
+					    &closure);
 
 	return modes + closure.modes;
 }
@@ -3194,7 +3192,7 @@ add_standard_modes(struct drm_connector *connector, struct edid *edid)
 	}
 
 	if (version_greater(edid, 1, 0))
-		drm_for_each_detailed_block((u8 *)edid, do_standard_modes,
+		drm_for_each_detailed_block(edid, do_standard_modes,
 					    &closure);
 
 	/* XXX should also look for standard codes in VTB blocks */
@@ -3274,7 +3272,7 @@ add_cvt_modes(struct drm_connector *connector, struct edid *edid)
 	};
 
 	if (version_greater(edid, 1, 2))
-		drm_for_each_detailed_block((u8 *)edid, do_cvt_mode, &closure);
+		drm_for_each_detailed_block(edid, do_cvt_mode, &closure);
 
 	/* XXX should also look for CVT codes in VTB blocks */
 
@@ -3334,7 +3332,7 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
 		closure.preferred =
 		    (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
 
-	drm_for_each_detailed_block((u8 *)edid, do_detailed_mode, &closure);
+	drm_for_each_detailed_block(edid, do_detailed_mode, &closure);
 
 	return closure.modes;
 }
@@ -4535,7 +4533,7 @@ static int get_monitor_name(struct edid *edid, char name[13])
 	if (!edid || !name)
 		return 0;
 
-	drm_for_each_detailed_block((u8 *)edid, monitor_name, &edid_name);
+	drm_for_each_detailed_block(edid, monitor_name, &edid_name);
 	for (mnl = 0; edid_name && mnl < 13; mnl++) {
 		if (edid_name[mnl] == 0x0a)
 			break;
@@ -5276,7 +5274,7 @@ void drm_get_monitor_range(struct drm_connector *connector,
 	if (!version_greater(edid, 1, 1))
 		return;
 
-	drm_for_each_detailed_block((u8 *)edid, get_monitor_range,
+	drm_for_each_detailed_block(edid, get_monitor_range,
 				    &info->monitor_range);
 
 	DRM_DEBUG_KMS("Supported Monitor Refresh rate range is %d Hz - %d Hz\n",