[media] solo6x10: Reduce OSD writes to the minimum necessary

Instead of unconditionally writing SOLO_EOSD_EXT_SIZE() bytes to the OSD
area (which is 64 or 128 kB depending on the PCI board) we only
write the actual amount of data needed which is 16 * OSD_TEXT_MAX (= 16 * 44).

Signed-off-by: Ismael Luceno <ismael.luceno@corp.bluecherry.net>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/staging/media/solo6x10/solo6x10-enc.c b/drivers/staging/media/solo6x10/solo6x10-enc.c
index 94d5735..2db53b6 100644 (file)
--- a/drivers/staging/media/solo6x10/solo6x10-enc.c
+++ b/drivers/staging/media/solo6x10/solo6x10-enc.c
@@ -134,51 +134,48 @@ static void solo_capture_config(struct solo_dev *solo_dev)
        kfree(buf);
 }
 
+#define SOLO_OSD_WRITE_SIZE (16 * OSD_TEXT_MAX)
+
 /* Should be called with enable_lock held */
 int solo_osd_print(struct solo_enc_dev *solo_enc)
 {
        struct solo_dev *solo_dev = solo_enc->solo_dev;
        unsigned char *str = solo_enc->osd_text;
        u8 *buf = solo_enc->osd_buf;
-       u32 reg = solo_reg_read(solo_dev, SOLO_VE_OSD_CH);
+       u32 reg;
        const struct font_desc *vga = find_font("VGA8x16");
        const unsigned char *vga_data;
-       int len;
        int i, j;
 
        if (WARN_ON_ONCE(!vga))
                return -ENODEV;
 
-       len = strlen(str);
-
-       if (len == 0) {
+       reg = solo_reg_read(solo_dev, SOLO_VE_OSD_CH);
+       if (!*str) {
                /* Disable OSD on this channel */
                reg &= ~(1 << solo_enc->ch);
-               solo_reg_write(solo_dev, SOLO_VE_OSD_CH, reg);
-               return 0;
+               goto out;
        }
 
-       memset(buf, 0, SOLO_EOSD_EXT_SIZE_MAX);
+       memset(buf, 0, SOLO_OSD_WRITE_SIZE);
        vga_data = (const unsigned char *)vga->data;
 
-       for (i = 0; i < len; i++) {
-               unsigned char c = str[i];
-
+       for (i = 0; *str; i++, str++) {
                for (j = 0; j < 16; j++) {
-                       buf[(j * 2) + (i % 2) + (i / 2 * 32)] =
-                               bitrev8(vga_data[(c * 16) + j]);
+                       buf[(j << 1) | (i & 1) | ((i & ~1) << 4)] =
+                           bitrev8(vga_data[(*str << 4) | j]);
                }
        }
 
        solo_p2m_dma(solo_dev, 1, buf,
-                    SOLO_EOSD_EXT_ADDR +
-                    (solo_enc->ch * SOLO_EOSD_EXT_SIZE(solo_dev)),
-                    SOLO_EOSD_EXT_SIZE(solo_dev), 0, 0);
+                    SOLO_EOSD_EXT_ADDR_CHAN(solo_dev, solo_enc->ch),
+                    SOLO_OSD_WRITE_SIZE, 0, 0);
 
        /* Enable OSD on this channel */
        reg |= (1 << solo_enc->ch);
-       solo_reg_write(solo_dev, SOLO_VE_OSD_CH, reg);
 
+out:
+       solo_reg_write(solo_dev, SOLO_VE_OSD_CH, reg);
        return 0;
 }
 

diff --git a/drivers/staging/media/solo6x10/solo6x10-offsets.h b/drivers/staging/media/solo6x10/solo6x10-offsets.h
index f005dca..13eeb44 100644 (file)
--- a/drivers/staging/media/solo6x10/solo6x10-offsets.h
+++ b/drivers/staging/media/solo6x10/solo6x10-offsets.h
@@ -35,6 +35,8 @@
 #define SOLO_EOSD_EXT_SIZE_MAX                 0x20000
 #define SOLO_EOSD_EXT_AREA(__solo) \
        (SOLO_EOSD_EXT_SIZE(__solo) * 32)
+#define SOLO_EOSD_EXT_ADDR_CHAN(__solo, ch) \
+       (SOLO_EOSD_EXT_ADDR + SOLO_EOSD_EXT_SIZE(__solo) * (ch))
 
 #define SOLO_MOTION_EXT_ADDR(__solo) \
        (SOLO_EOSD_EXT_ADDR + SOLO_EOSD_EXT_AREA(__solo))