[media] cx23885: Altera FPGA CI interface reworked

It decreases I2C traffic.

Signed-off-by: Abylay Ospan <aospan@netup.ru>
Signed-off-by: Igor M. Liplianin <liplianin@netup.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/cx23885/cx23885-dvb.c b/drivers/media/video/cx23885/cx23885-dvb.c
index cf36b9b..c0e6655 100644 (file)
--- a/drivers/media/video/cx23885/cx23885-dvb.c
+++ b/drivers/media/video/cx23885/cx23885-dvb.c
@@ -620,29 +620,29 @@ int netup_altera_fpga_rw(void *device, int flag, int data, int read)
 {
        struct cx23885_dev *dev = (struct cx23885_dev *)device;
        unsigned long timeout = jiffies + msecs_to_jiffies(1);
-       int mem = 0;
+       uint32_t mem = 0;
 
-       cx_set(MC417_RWD, ALT_RD | ALT_WR | ALT_CS);
+       mem = cx_read(MC417_RWD);
        if (read)
                cx_set(MC417_OEN, ALT_DATA);
        else {
                cx_clear(MC417_OEN, ALT_DATA);/* D0-D7 out */
-               mem = cx_read(MC417_RWD);
                mem &= ~ALT_DATA;
                mem |= (data & ALT_DATA);
-               cx_write(MC417_RWD, mem);
        }
 
        if (flag)
-               cx_set(MC417_RWD, ALT_AD_RG);/* ADDR */
+               mem |= ALT_AD_RG;
        else
-               cx_clear(MC417_RWD, ALT_AD_RG);/* VAL */
+               mem &= ~ALT_AD_RG;
 
-       cx_clear(MC417_RWD, ALT_CS);/* ~CS */
+       mem &= ~ALT_CS;
        if (read)
-               cx_clear(MC417_RWD, ALT_RD);
+               mem = (mem & ~ALT_RD) | ALT_WR;
        else
-               cx_clear(MC417_RWD, ALT_WR);
+               mem = (mem & ~ALT_WR) | ALT_RD;
+
+       cx_write(MC417_RWD, mem);  /* start RW cycle */
 
        for (;;) {
                mem = cx_read(MC417_RWD);