BACKPORT: media: venus: assign unique bus_info strings for encoder and decoder

The Venus encoder and decoder video devices currently report the same
bus_info string ("platform:qcom-venus").

Assign unique bus_info identifiers by appending ":dec" and ":enc" to the
parent device name. With this change v4l2-ctl will display two separate
logical devices

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez@oss.qualcomm.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Bryan O'Donoghue <bod@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Link: https://lore.kernel.org/all/20251126140041.754071-1-jorge.ramirez@oss.qualcomm.com/
(cherry picked from commit 66c744e)

Author: ldts

drivers/media/platform/qcom/venus/vdec.c

@@ -435,9 +435,13 @@ vdec_g_selection(struct file *file, void *fh, struct v4l2_selection *s)
 static int
 vdec_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 {
+	struct venus_inst *inst = to_inst(file);
+	struct venus_core *core = inst->core;
+
 	strscpy(cap->driver, "qcom-venus", sizeof(cap->driver));
 	strscpy(cap->card, "Qualcomm Venus video decoder", sizeof(cap->card));
-	strscpy(cap->bus_info, "platform:qcom-venus", sizeof(cap->bus_info));
+	snprintf(cap->bus_info, sizeof(cap->bus_info),
+		 "plat:%s:dec", dev_name(core->dev));
 
 	return 0;
 }

drivers/media/platform/qcom/venus/venc.c

@@ -144,9 +144,13 @@ static int venc_v4l2_to_hfi(int id, int value)
 static int
 venc_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 {
+	struct venus_inst *inst = to_inst(file);
+	struct venus_core *core = inst->core;
+
 	strscpy(cap->driver, "qcom-venus", sizeof(cap->driver));
 	strscpy(cap->card, "Qualcomm Venus video encoder", sizeof(cap->card));
-	strscpy(cap->bus_info, "platform:qcom-venus", sizeof(cap->bus_info));
+	snprintf(cap->bus_info, sizeof(cap->bus_info),
+		 "plat:%s:enc", dev_name(core->dev));
 
 	return 0;
 }