media: atomisp: Add ia_css_frame_pad_width() helper function

Factor the code to go from width to a properly aligned pitch out of
ia_css_frame_info_set_width().

This is a preparation patch to fix try_fmt() calls returning a bogus
bytesperline value.

Link: https://lore.kernel.org/r/20230529103741.11904-14-hdegoede@redhat.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/runtime/frame/interface/ia_css_frame.h

@@ -138,4 +138,6 @@ bool ia_css_frame_is_same_type(
 int ia_css_dma_configure_from_info(struct dma_port_config *config,
 				   const struct ia_css_frame_info *info);
 
+unsigned int ia_css_frame_pad_width(unsigned int width, enum ia_css_frame_format format);
+
 #endif /* __IA_CSS_FRAME_H__ */

drivers/staging/media/atomisp/pci/runtime/frame/src/frame.c

@@ -269,6 +269,34 @@ int ia_css_frame_init_planes(struct ia_css_frame *frame)
 	return 0;
 }
 
+unsigned int ia_css_frame_pad_width(unsigned int width, enum ia_css_frame_format format)
+{
+	switch (format) {
+	/*
+	 * Frames with a U and V plane of 8 bits per pixel need to have
+	 * all planes aligned, this means double the alignment for the
+	 * Y plane if the horizontal decimation is 2.
+	 */
+	case IA_CSS_FRAME_FORMAT_YUV420:
+	case IA_CSS_FRAME_FORMAT_YV12:
+	case IA_CSS_FRAME_FORMAT_NV12:
+	case IA_CSS_FRAME_FORMAT_NV21:
+	case IA_CSS_FRAME_FORMAT_BINARY_8:
+	case IA_CSS_FRAME_FORMAT_YUV_LINE:
+		return CEIL_MUL(width, 2 * HIVE_ISP_DDR_WORD_BYTES);
+
+	case IA_CSS_FRAME_FORMAT_NV12_TILEY:
+		return CEIL_MUL(width, NV12_TILEY_TILE_WIDTH);
+
+	case IA_CSS_FRAME_FORMAT_RAW:
+	case IA_CSS_FRAME_FORMAT_RAW_PACKED:
+		return CEIL_MUL(width, 2 * ISP_VEC_NELEMS);
+
+	default:
+		return CEIL_MUL(width, HIVE_ISP_DDR_WORD_BYTES);
+	}
+}
+
 void ia_css_frame_info_set_width(struct ia_css_frame_info *info,
 				 unsigned int width,
 				 unsigned int min_padded_width)
@@ -285,25 +313,8 @@ void ia_css_frame_info_set_width(struct ia_css_frame_info *info,
 	align = max(min_padded_width, width);
 
 	info->res.width = width;
-	/* frames with a U and V plane of 8 bits per pixel need to have
-	   all planes aligned, this means double the alignment for the
-	   Y plane if the horizontal decimation is 2. */
-	if (info->format == IA_CSS_FRAME_FORMAT_YUV420 ||
-	    info->format == IA_CSS_FRAME_FORMAT_YV12 ||
-	    info->format == IA_CSS_FRAME_FORMAT_NV12 ||
-	    info->format == IA_CSS_FRAME_FORMAT_NV21 ||
-	    info->format == IA_CSS_FRAME_FORMAT_BINARY_8 ||
-	    info->format == IA_CSS_FRAME_FORMAT_YUV_LINE)
-		info->padded_width =
-		    CEIL_MUL(align, 2 * HIVE_ISP_DDR_WORD_BYTES);
-	else if (info->format == IA_CSS_FRAME_FORMAT_NV12_TILEY)
-		info->padded_width = CEIL_MUL(align, NV12_TILEY_TILE_WIDTH);
-	else if (info->format == IA_CSS_FRAME_FORMAT_RAW ||
-		 info->format == IA_CSS_FRAME_FORMAT_RAW_PACKED)
-		info->padded_width = CEIL_MUL(align, 2 * ISP_VEC_NELEMS);
-	else {
-		info->padded_width = CEIL_MUL(align, HIVE_ISP_DDR_WORD_BYTES);
-	}
+	info->padded_width = ia_css_frame_pad_width(align, info->format);
+
 	IA_CSS_LEAVE_PRIVATE("");
 }