linux-kernel - [PATCH 5/9] media: stm32: csi: use ARRAY

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Message-ID: <20241217-csi_dcmipp_mp25_enhancements-v1-5-2b432805d17d@foss.st.com>
Date: Tue, 17 Dec 2024 18:39:22 +0100
From: Alain Volmat <alain.volmat@...s.st.com>
To: Hugues Fruchet <hugues.fruchet@...s.st.com>,
        Mauro Carvalho Chehab
	<mchehab@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre
 Torgue <alexandre.torgue@...s.st.com>,
        Hans Verkuil <hverkuil@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
CC: <linux-media@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, Alain Volmat <alain.volmat@...s.st.com>
Subject: [PATCH 5/9] media: stm32: csi: use ARRAY_SIZE to search D-PHY
 table

Within stm32_csi_start, use ARRAY_SIZE loop in order to search
for the right setting.
Avoid useless init of lanes_ie / lanes_en.

Signed-off-by: Alain Volmat <alain.volmat@...s.st.com>
---
 drivers/media/platform/st/stm32/stm32-csi.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/media/platform/st/stm32/stm32-csi.c b/drivers/media/platform/st/stm32/stm32-csi.c
index 89fcd7d07904..3654f9895dbc 100644
--- a/drivers/media/platform/st/stm32/stm32-csi.c
+++ b/drivers/media/platform/st/stm32/stm32-csi.c
@@ -325,7 +325,6 @@ static const struct stm32_csi_mbps_phy_reg snps_stm32mp25[] = {
 	{ .mbps = 2400, .hsfreqrange = 0x47,	.osc_freq_target = 442 },
 	{ .mbps = 2450, .hsfreqrange = 0x48,	.osc_freq_target = 451 },
 	{ .mbps = 2500, .hsfreqrange = 0x49,	.osc_freq_target = 460 },
-	{ /* sentinel */ }
 };
 
 static const struct v4l2_mbus_framefmt fmt_default = {
@@ -444,13 +443,13 @@ static void stm32_csi_phy_reg_write(struct stm32_csi_dev *csidev,
 static int stm32_csi_start(struct stm32_csi_dev *csidev,
 			   struct v4l2_subdev_state *state)
 {
-	const struct stm32_csi_mbps_phy_reg *phy_regs;
+	const struct stm32_csi_mbps_phy_reg *phy_regs = NULL;
 	struct v4l2_mbus_framefmt *sink_fmt;
 	const struct stm32_csi_fmts *fmt;
 	unsigned long phy_clk_frate;
+	u32 lanes_ie, lanes_en;
 	unsigned int mbps;
-	u32 lanes_ie = 0;
-	u32 lanes_en = 0;
+	unsigned int i;
 	s64 link_freq;
 	int ret;
 	u32 ccfr;
@@ -474,11 +473,14 @@ static int stm32_csi_start(struct stm32_csi_dev *csidev,
 	mbps = div_s64(link_freq, 500000);
 	dev_dbg(csidev->dev, "Computed Mbps: %u\n", mbps);
 
-	for (phy_regs = snps_stm32mp25; phy_regs->mbps != 0; phy_regs++)
-		if (phy_regs->mbps >= mbps)
+	for (i = 0; i < ARRAY_SIZE(snps_stm32mp25); i++) {
+		if (snps_stm32mp25[i].mbps >= mbps) {
+			phy_regs = &snps_stm32mp25[i];
 			break;
+		}
+	}
 
-	if (!phy_regs->mbps) {
+	if (!phy_regs) {
 		dev_err(csidev->dev, "Unsupported PHY speed (%u Mbps)", mbps);
 		return -ERANGE;
 	}
@@ -488,8 +490,8 @@ static int stm32_csi_start(struct stm32_csi_dev *csidev,
 		phy_regs->osc_freq_target);
 
 	/* Prepare lanes related configuration bits */
-	lanes_ie |= STM32_CSI_SR1_DL0_ERRORS;
-	lanes_en |= STM32_CSI_PCR_DL0EN;
+	lanes_ie = STM32_CSI_SR1_DL0_ERRORS;
+	lanes_en = STM32_CSI_PCR_DL0EN;
 	if (csidev->num_lanes == 2) {
 		lanes_ie |= STM32_CSI_SR1_DL1_ERRORS;
 		lanes_en |= STM32_CSI_PCR_DL1EN;

-- 
2.34.1