linux-kernel - [PATCH] media: qcom: camss: Use a macro to specify the initial buffer count

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Message-Id: <20251014-use-marco-to-denote-image-buffer-number-v1-1-f782e4cc622d@oss.qualcomm.com>
Date: Tue, 14 Oct 2025 19:42:30 -0700
From: Hangxiang Ma <hangxiang.ma@....qualcomm.com>
To: Loic Poulain <loic.poulain@....qualcomm.com>,
        Robert Foss <rfoss@...nel.org>, Andi Shyti <andi.shyti@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Todor Tomov <todor.too@...il.com>,
        Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Cc: linux-i2c@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org,
        Hangxiang Ma <hangxiang.ma@....qualcomm.com>
Subject: [PATCH] media: qcom: camss: Use a macro to specify the initial
 buffer count

Replace the hardcoded buffer count value with a macro to enable
operating on these buffers elsewhere in the CAMSS driver based on this
count. Some of the hardware architectures require deferring the AUP and
REG update until after the CSID configuration and this macro is expected
to be useful in such scenarios.

Signed-off-by: Hangxiang Ma <hangxiang.ma@....qualcomm.com>
---
This change use a global macro to specify the initial buffer count. It
meets the requirement that some hardware architectures need to defer the
AUP and REG update to CSID configuration stage.
---
 drivers/media/platform/qcom/camss/camss-vfe.c | 2 +-
 drivers/media/platform/qcom/camss/camss.h     | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
index 09b29ba383f1..2753c2bb6c04 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe.c
@@ -541,7 +541,7 @@ int vfe_enable_output_v2(struct vfe_line *line)
 
 	ops->vfe_wm_start(vfe, output->wm_idx[0], line);
 
-	for (i = 0; i < 2; i++) {
+	for (i = 0; i < CAMSS_INIT_BUF_COUNT; i++) {
 		output->buf[i] = vfe_buf_get_pending(output);
 		if (!output->buf[i])
 			break;
diff --git a/drivers/media/platform/qcom/camss/camss.h b/drivers/media/platform/qcom/camss/camss.h
index a70fbc78ccc3..901f84efaf7d 100644
--- a/drivers/media/platform/qcom/camss/camss.h
+++ b/drivers/media/platform/qcom/camss/camss.h
@@ -41,6 +41,7 @@
 	(to_camss_index(ptr_module, index)->dev)
 
 #define CAMSS_RES_MAX 17
+#define CAMSS_INIT_BUF_COUNT 2
 
 struct camss_subdev_resources {
 	char *regulators[CAMSS_RES_MAX];

---
base-commit: 59a69ef338920ca6a5bca3ec0e13ce32809cea23
change-id: 20251012-use-marco-to-denote-image-buffer-number-cbec071b8436

Best regards,
-- 
Hangxiang Ma <hangxiang.ma@....qualcomm.com>