[PATCH v3 2/7] media: i2c: imx290: Define absolute control ranges

[bbara93]

From: Benjamin Bara <benjamin.bara@xxxxxxxxxxx>

For now, the driver activates the first mode (1080p) as current active
mode in probe(). This e.g. means that one cannot set VBLANK below 45
(vmax_min - height), although theoretically the minimum is 30 (720p
mode). Define the absolute possible/supported ranges to have them
available later.

Signed-off-by: Benjamin Bara <benjamin.bara@xxxxxxxxxxx>
---
Changes since v2:
- new
---
 drivers/media/i2c/imx290.c | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
index 1c97f9650eb4..466492bab600 100644
--- a/drivers/media/i2c/imx290.c
+++ b/drivers/media/i2c/imx290.c
@@ -499,6 +499,10 @@ static const struct imx290_clk_cfg imx290_720p_clock_config[] = {
 };
 
 /* Mode configs */
+#define WIDTH_720P	1280
+#define HEIGHT_720P	720
+#define MINIMUM_WIDTH	WIDTH_720P
+#define MINIMUM_HEIGHT	HEIGHT_720P
 static const struct imx290_mode imx290_modes_2lanes[] = {
 	{
 		.width = 1920,
@@ -512,8 +516,8 @@ static const struct imx290_mode imx290_modes_2lanes[] = {
 		.clk_cfg = imx290_1080p_clock_config,
 	},
 	{
-		.width = 1280,
-		.height = 720,
+		.width = WIDTH_720P,
+		.height = HEIGHT_720P,
 		.hmax_min = 3300,
 		.vmax_min = 750,
 		.link_freq_index = FREQ_INDEX_720P,
@@ -537,8 +541,8 @@ static const struct imx290_mode imx290_modes_4lanes[] = {
 		.clk_cfg = imx290_1080p_clock_config,
 	},
 	{
-		.width = 1280,
-		.height = 720,
+		.width = WIDTH_720P,
+		.height = HEIGHT_720P,
 		.hmax_min = 3300,
 		.vmax_min = 750,
 		.link_freq_index = FREQ_INDEX_720P,
@@ -846,6 +850,30 @@ static const char * const imx290_test_pattern_menu[] = {
 	"000/555h Toggle Pattern",
 };
 
+/* absolute supported control ranges */
+#define HBLANK_MAX	(IMX290_HMAX_MAX - MINIMUM_WIDTH)
+#define VBLANK_MAX	(IMX290_VMAX_MAX - MINIMUM_HEIGHT)
+static unsigned int imx290_get_blank_min(const struct imx290 *imx290, bool v)
+{
+	const struct imx290_mode *modes = imx290_modes_ptr(imx290);
+	unsigned int min = UINT_MAX;
+	int i;
+
+	for (i = 0; i < imx290_modes_num(imx290); i++) {
+		unsigned int tmp;
+
+		if (v)
+			tmp = modes[i].hmax_min - modes[i].width;
+		else
+			tmp = modes[i].vmax_min - modes[i].height;
+
+		if (tmp < min)
+			min = tmp;
+	}
+
+	return min;
+}
+
 static void imx290_ctrl_update(struct imx290 *imx290,
 			       const struct imx290_mode *mode)
 {

-- 
2.46.0