On Thursday 29 November 2012 05:48 PM, Tomi Valkeinen wrote:
> On 2012-11-28 12:41, Chandrabhanu Mahapatra wrote:
>> The register fields in dss_reg_fields specific to DISPC are moved from struct
>> omap_dss_features to corresponding dispc_reg_fields, initialized in struct
>> dispc_features, thereby enabling local access.
>>
>> Signed-off-by: Chandrabhanu Mahapatra <cmahapatra@xxxxxx>
>> ---
>> drivers/video/omap2/dss/dispc.c | 87 ++++++++++++++++++++++++++++----
>> drivers/video/omap2/dss/dss.h | 4 ++
>> drivers/video/omap2/dss/dss_features.c | 28 ----------
>> drivers/video/omap2/dss/dss_features.h | 7 ---
>> 4 files changed, 80 insertions(+), 46 deletions(-)
>>
>> diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c
>> index 9f259ba..21fc522 100644
>> --- a/drivers/video/omap2/dss/dispc.c
>> +++ b/drivers/video/omap2/dss/dispc.c
>> @@ -80,6 +80,16 @@ struct dispc_irq_stats {
>> unsigned irqs[32];
>> };
>>
>> +enum dispc_feat_reg_field {
>> + FEAT_REG_FIRHINC,
>> + FEAT_REG_FIRVINC,
>> + FEAT_REG_FIFOLOWTHRESHOLD,
>> + FEAT_REG_FIFOHIGHTHRESHOLD,
>> + FEAT_REG_FIFOSIZE,
>> + FEAT_REG_HORIZONTALACCU,
>> + FEAT_REG_VERTICALACCU,
>> +};
>> +
>> struct dispc_features {
>> u8 sw_start;
>> u8 fp_start;
>> @@ -107,6 +117,8 @@ struct dispc_features {
>>
>> u32 buffer_size_unit;
>> u32 burst_size_unit;
>> +
>> + struct register_field *reg_fields;
>> };
>
> Hmm, would it be simpler to have an explicit struct for the reg fields.
> I mean something like:
>
> struct dispc_reg_fields {
> struct register_field firhinc;
> struct register_field firvinc;
> struct register_field fifo_low_threshold;
> ...
> };
>
> Then accessing it would be
>
> dispc.feat->reg_fields.firhinc.start;
>
> instead of
>
> dispc.feat->reg_fields[FEAT_REG_FIFOSIZE].start;
>
> Not a big difference, but I don't see any benefit in having an array of
> reg fields here.
>
> Tomi
>
>
I was thinking to move reg_fields into the dispc_feats structure as
.burst_size_unit = 8,
.reg_fields = {
.firhinc = { 12, 0 },
.firvinc = { 28, 16 },
.fifo_low_thresh = { 11, 0 },
.fifo_high_thresh = { 27, 16 },
.fifosize = { 10, 0 },
.hori_accu = { 9, 0 },
.vert_accu = { 25, 16 },
},
This would give us dispc.feat->reg_fields.firhinc.start;
but at the same time would create duplicate information for
omap34xx_rev1_0_dispc_feats and omap34xx_rev3_0_dispc_feats. However,
this duplication never occurs anywhere else in dss.c or dsi.c.
If we still go with the older approach of having dispc_reg_fields
outside dispc_feats the only way it works is
.reg_fields = &omap2_dispc_reg_fields
which changes as dispc.feat->reg_fields->firhinc.start;
but avoids duplicate information. Both approaches seem good enough to me.
--
Chandrabhanu Mahapatra
Texas Instruments India Pvt. Ltd.
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