Thanks for the review Ville and Neil, response inline.
> -----Original Message-----
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Sent: 02 December 2019 09:43
> To: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> Cc: Devarsh Thakkar <DEVARSHT@xxxxxxxxxx>; Ranganathan Sk
> <rsk@xxxxxxxxxx>; vcu-team <vcu-team@xxxxxxxxxx>; Dhaval Rajeshbhai Shah
> <dshah@xxxxxxxxxx>; dri-devel@xxxxxxxxxxxxxxxxxxxxx; Varunkumar
> Allagadapa <VARUNKUM@xxxxxxxxxx>
> Subject: Re: [PATCH libdrm v3] modetest: Use floating vrefresh while dumping
> mode
>
> EXTERNAL EMAIL
>
> On Mon, Dec 02, 2019 at 06:22:56PM +0100, Neil Armstrong wrote:
> > On 02/12/2019 18:12, Ville Syrjälä wrote:
> > > On Mon, Dec 02, 2019 at 03:27:51AM -0800, Devarsh Thakkar wrote:
> > >> Add function to derive floating value of vertical refresh rate from
> > >> drm mode using pixel clock, horizontal total size and vertical
> > >> total size.
> > >>
> > >> Use this function to find suitable mode having vrefresh value which
> > >> is matching with user provided vrefresh value.
> > >>
> > >> If user doesn't provide any vrefresh value in args then update
> > >> vertical refresh rate value in pipe args using this function.
> > >>
> > >> Also use this function for printing floating vrefresh while dumping
> > >> all available modes.
> > >>
> > >> This will give more accurate picture to user for available modes
> > >> differentiated by floating vertical refresh rate and help user
> > >> select more appropriate mode using suitable refresh rate value.
> > >>
> > >> V3: Change name of function used to derive refresh rate.
> > >> V2: 1) Don't use inline function for deriving refresh rate from mode.
> > >> 2) If requested mode not found, print refresh rate only
> > >> if user had provided it in args.
> > >>
> > >> Signed-off-by: Devarsh Thakkar <devarsh.thakkar@xxxxxxxxxx>
> > >> ---
> > >> tests/modetest/modetest.c | 40
> > >> +++++++++++++++++++++++++++-------------
> > >> 1 file changed, 27 insertions(+), 13 deletions(-)
> > >>
> > >> diff --git a/tests/modetest/modetest.c b/tests/modetest/modetest.c
> > >> index b4edfcb..19ce20f 100644
> > >> --- a/tests/modetest/modetest.c
> > >> +++ b/tests/modetest/modetest.c
> > >> @@ -133,6 +133,12 @@ static inline int64_t U642I64(uint64_t val)
> > >> return (int64_t)*((int64_t *)&val); }
> > >>
> > >> +static float mode_vrefresh(drmModeModeInfo *mode) {
> > >> + return mode->clock * 1000.00
> > >> + / (mode->htotal * mode->vtotal); }
> > >> +
> > >> #define bit_name_fn(res) \
> > >> const char * res##_str(int type) { \
> > >> unsigned int i; \
> > >> @@ -210,9 +216,9 @@ static void dump_encoders(struct device *dev)
> > >>
> > >> static void dump_mode(drmModeModeInfo *mode) {
> > >> - printf(" %s %d %d %d %d %d %d %d %d %d %d",
> > >> + printf(" %s %.2f %d %d %d %d %d %d %d %d %d",
> > >> mode->name,
> > >> - mode->vrefresh,
> > >> + mode_vrefresh(mode),
> > >> mode->hdisplay,
> > >> mode->hsync_start,
> > >> mode->hsync_end,
> > >> @@ -823,12 +829,11 @@ struct plane_arg {
> > >>
> > >> static drmModeModeInfo *
> > >> connector_find_mode(struct device *dev, uint32_t con_id, const
> > >> char *mode_str,
> > >> - const float vrefresh)
> > >> + float *vrefresh)
> > >
> > > This change still looks pointless.
> >
The only small advantage it offers is that it backs up the vrefresh from mode in pipe_args in connector_find_mode and I don't have to call mode_vrefresh again while printing below :
printf("setting mode %s-%.2fHz on connectors ",
pipe->mode_str, pipe->vrefresh);
If this is not preferable then it's not mandatory either, then instead of doing this I can call mode_vrefresh again while printing the mode as below :
printf("setting mode %s-%.2fHz on connectors ",
pipe->mode_str, mode_vrefresh(pipe->mode))
Kindly let me know your opinion.
> > Without this, you cannot set 1000/1001 CEA alternate clock modes, so, no
> this is not pointless.
>
> I'm talking about this specific s/float/float*/ change. That is pointless. Are you
> talking about the whole patch or what?
>
> >
> > This is actual something I always wanted to implement !
> >
> > Reviewed-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> >
Thanks for the review Neil.
> > >
> > >> {
> > >> drmModeConnector *connector;
> > >> drmModeModeInfo *mode;
> > >> int i;
> > >> - float mode_vrefresh;
> > >>
> > >> connector = get_connector_by_id(dev, con_id);
> > >> if (!connector || !connector->count_modes) @@ -837,16 +842,19
> @@
> > >> connector_find_mode(struct device *dev, uint32_t con_id, const char
> *mode_str,
> > >> for (i = 0; i < connector->count_modes; i++) {
> > >> mode = &connector->modes[i];
> > >> if (!strcmp(mode->name, mode_str)) {
> > >> - /* If the vertical refresh frequency is not specified then
> return the
> > >> - * first mode that match with the name. Else, return the mode
> that match
> > >> - * the name and the specified vertical refresh frequency.
> > >> + /* If the vertical refresh frequency is not specified
> > >> + * then return the first mode that match with the name
> > >> + * and update corresponding vrefresh in pipe_arg.
> > >> + * Else, return the mode that match the name and
> > >> + * the specified vertical refresh frequency.
> > >> */
> > >> - mode_vrefresh = mode->clock * 1000.00
> > >> - / (mode->htotal * mode->vtotal);
> > >> - if (vrefresh == 0)
> > >> + if (*vrefresh == 0) {
> > >> + *vrefresh = mode_vrefresh(mode);
> > >> return mode;
> > >> - else if (fabs(mode_vrefresh - vrefresh) < 0.005)
> > >> + } else if (fabs(mode_vrefresh(mode)
> > >> + - *vrefresh) < 0.005) {
> > >> return mode;
> > >> + }
> > >> }
> > >> }
> > >>
> > >> @@ -909,9 +917,15 @@ static int pipe_find_crtc_and_mode(struct
> > >> device *dev, struct pipe_arg *pipe)
> > >>
> > >> for (i = 0; i < (int)pipe->num_cons; i++) {
> > >> mode = connector_find_mode(dev, pipe->con_ids[i],
> > >> - pipe->mode_str, pipe->vrefresh);
> > >> + pipe->mode_str,
> > >> + &pipe->vrefresh);
> > >> if (mode == NULL) {
> > >> - fprintf(stderr,
> > >> + if (pipe->vrefresh)
> > >> + fprintf(stderr,
> > >> + "failed to find mode "
> > >> + "\"%s-%.2fHz\" for connector %s\n",
> > >> + pipe->mode_str, pipe->vrefresh, pipe->cons[i]);
> > >> + else
> > >> + fprintf(stderr,
> > >> "failed to find mode \"%s\" for connector %s\n",
> > >> pipe->mode_str, pipe->cons[i]);
> > >> return -EINVAL;
> > >> --
> > >> 2.7.4
> > >
>
> --
> Ville Syrjälä
> Intel
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