[PATCH] [media] atmel-isc: Set the default DMA memory burst size

[Songjun Wu]

Sometimes 'DMA single access' is not enough to transfer
a frame of image, '8-beat burst access' is set as the
default DMA memory burst size.

Signed-off-by: Songjun Wu <songjun...@microchip.com>
---

 drivers/media/platform/atmel/atmel-isc.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/media/platform/atmel/atmel-isc.c 
b/drivers/media/platform/atmel/atmel-isc.c
index c4b2115559a5..78d966233f80 100644
--- a/drivers/media/platform/atmel/atmel-isc.c
+++ b/drivers/media/platform/atmel/atmel-isc.c
@@ -239,13 +239,11 @@ static struct isc_format isc_formats[] = {
 
        { V4L2_PIX_FMT_YUV420, 0x0, 12,
          ISC_PFE_CFG0_BPS_EIGHT, ISC_BAY_CFG_BGBG, ISC_RLP_CFG_MODE_YYCC,
-         ISC_DCFG_IMODE_YC420P | ISC_DCFG_YMBSIZE_BEATS8 |
-         ISC_DCFG_CMBSIZE_BEATS8, ISC_DCTRL_DVIEW_PLANAR, 0x7fb,
+         ISC_DCFG_IMODE_YC420P, ISC_DCTRL_DVIEW_PLANAR, 0x7fb,
          false, false },
        { V4L2_PIX_FMT_YUV422P, 0x0, 16,
          ISC_PFE_CFG0_BPS_EIGHT, ISC_BAY_CFG_BGBG, ISC_RLP_CFG_MODE_YYCC,
-         ISC_DCFG_IMODE_YC422P | ISC_DCFG_YMBSIZE_BEATS8 |
-         ISC_DCFG_CMBSIZE_BEATS8, ISC_DCTRL_DVIEW_PLANAR, 0x3fb,
+         ISC_DCFG_IMODE_YC422P, ISC_DCTRL_DVIEW_PLANAR, 0x3fb,
          false, false },
        { V4L2_PIX_FMT_RGB565, MEDIA_BUS_FMT_RGB565_2X8_LE, 16,
          ISC_PFE_CFG0_BPS_EIGHT, ISC_BAY_CFG_BGBG, ISC_RLP_CFG_MODE_RGB565,
@@ -700,8 +698,10 @@ static void isc_set_histogram(struct isc_device *isc)
 }
 
 static inline void isc_get_param(const struct isc_format *fmt,
-                                    u32 *rlp_mode, u32 *dcfg_imode)
+                                 u32 *rlp_mode, u32 *dcfg)
 {
+       *dcfg = ISC_DCFG_YMBSIZE_BEATS8;
+
        switch (fmt->fourcc) {
        case V4L2_PIX_FMT_SBGGR10:
        case V4L2_PIX_FMT_SGBRG10:
@@ -712,11 +712,11 @@ static inline void isc_get_param(const struct isc_format 
*fmt,
        case V4L2_PIX_FMT_SGRBG12:
        case V4L2_PIX_FMT_SRGGB12:
                *rlp_mode = fmt->reg_rlp_mode;
-               *dcfg_imode = fmt->reg_dcfg_imode;
+               *dcfg |= fmt->reg_dcfg_imode;
                break;
        default:
                *rlp_mode = ISC_RLP_CFG_MODE_DAT8;
-               *dcfg_imode = ISC_DCFG_IMODE_PACKED8;
+               *dcfg |= ISC_DCFG_IMODE_PACKED8;
                break;
        }
 }
@@ -726,18 +726,19 @@ static int isc_configure(struct isc_device *isc)
        struct regmap *regmap = isc->regmap;
        const struct isc_format *current_fmt = isc->current_fmt;
        struct isc_subdev_entity *subdev = isc->current_subdev;
-       u32 pfe_cfg0, rlp_mode, dcfg_imode, mask, pipeline;
+       u32 pfe_cfg0, rlp_mode, dcfg, mask, pipeline;
 
        if (sensor_is_preferred(current_fmt)) {
                pfe_cfg0 = current_fmt->reg_bps;
                pipeline = 0x0;
-               isc_get_param(current_fmt, &rlp_mode, &dcfg_imode);
+               isc_get_param(current_fmt, &rlp_mode, &dcfg);
                isc->ctrls.hist_stat = HIST_INIT;
        } else {
                pfe_cfg0  = isc->raw_fmt->reg_bps;
                pipeline = current_fmt->pipeline;
                rlp_mode = current_fmt->reg_rlp_mode;
-               dcfg_imode = current_fmt->reg_dcfg_imode;
+               dcfg = current_fmt->reg_dcfg_imode | ISC_DCFG_YMBSIZE_BEATS8 |
+                      ISC_DCFG_CMBSIZE_BEATS8;
        }
 
        pfe_cfg0  |= subdev->pfe_cfg0 | ISC_PFE_CFG0_MODE_PROGRESSIVE;
@@ -750,7 +751,7 @@ static int isc_configure(struct isc_device *isc)
        regmap_update_bits(regmap, ISC_RLP_CFG, ISC_RLP_CFG_MODE_MASK,
                           rlp_mode);
 
-       regmap_update_bits(regmap, ISC_DCFG, ISC_DCFG_IMODE_MASK, dcfg_imode);
+       regmap_write(regmap, ISC_DCFG, dcfg);
 
        /* Set the pipeline */
        isc_set_pipeline(isc, pipeline);
-- 
2.11.0