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SubjectRe: [PATCH 1/7] drm: atmel-hlcdc: add config option for clock selection
Hi Claudiu

On Wed, Feb 27, 2019 at 04:24:16PM +0000, Claudiu.Beznea@microchip.com wrote:
> From: Claudiu Beznea <claudiu.beznea@microchip.com>
>
> SAM9x60 LCD Controller has no option to select clock source as previous
> controllers have. To be able to use the same driver even for this LCD
> controller add a config option to know if controller supports this.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
> ---
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 12 +++++++-----
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h | 2 ++
> 2 files changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> index 8070a558d7b1..17a7a18f6a07 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> @@ -78,7 +78,8 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
> unsigned long mode_rate;
> struct videomode vm;
> unsigned long prate;
> - unsigned int cfg;
> + unsigned int mask = ATMEL_HLCDC_CLKDIV_MASK | ATMEL_HLCDC_CLKPOL;
> + unsigned int cfg = 0;
> int div;
Here cfg and mask has initial values.

>
> vm.vfront_porch = adj->crtc_vsync_start - adj->crtc_vdisplay;
> @@ -101,7 +102,10 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
> (adj->crtc_hdisplay - 1) |
> ((adj->crtc_vdisplay - 1) << 16));
>
> - cfg = ATMEL_HLCDC_CLKSEL;
> + if (!crtc->dc->desc->fixed_clksrc) {
> + cfg = ATMEL_HLCDC_CLKSEL;
> + mask |= ATMEL_HLCDC_CLKSEL;
> + }
And here mask is bitwise or with ATMEL_HLCDC_CLKSEL - fine.
But cfg is directly assigned.
If cfg was bitwise or the ATMEL_HLCDC_CLKSEL value then the code was prepared
to have extra flags added above these lines.

Only a small change and no functional difference.

With or without this change:
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>

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