Hi Niklas,
On Wed, Dec 12, 2018 at 11:07:17PM +0100, Niklas Cassel wrote:
> On Tue, Dec 04, 2018 at 02:42:29PM -0800, Matthias Kaehlcke wrote:
> > Get the ref clock of the PHY from the device tree instead of
> > hardcoding its name and rate.
> >
> > Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
> > ---
> > Changes in v4:
> > - always use parent rate in dsi_pll_28nm_clk_set_rate() and
> > dsi_pll_28nm_clk_recalc_rate()
> > - pass name of VCO ref clock to pll_28nm_register() instead of
> > storing it in a struct field
> > - updated commit message
> >
> > Changes in v3:
> > - use default name and rate if the ref clock is not specified
> > in the DT
> > - store vco_ref_clk_name instead of vco_ref_clk
> > - dsi_pll_28nm_clk_set_rate: changed data type of ref_clk_rate to
> > unsigned long
> > - fixed check for EPROBE_DEFER
> > - renamed VCO_REF_CLK_RATE to VCO_REF_CLK_DEFAULT_RATE
> >
> > Changes in v2:
> > - patch added to the series
> > ---
> > drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c | 36 +++++++++++++++-------
> > 1 file changed, 25 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c
> > index 26e3a01a99c2b..7777340b03e8d 100644
> > --- a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c
> > +++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c
> > @@ -40,7 +40,6 @@
> >
> > #define NUM_PROVIDED_CLKS 2
> >
> > -#define VCO_REF_CLK_RATE 19200000
> > #define VCO_MIN_RATE 350000000
> > #define VCO_MAX_RATE 750000000
> >
> > @@ -166,17 +165,17 @@ static int dsi_pll_28nm_clk_set_rate(struct clk_hw *hw, unsigned long rate,
> > pll_write(base + REG_DSI_28nm_PHY_PLL_LPFC1_CFG, 0x70);
> > pll_write(base + REG_DSI_28nm_PHY_PLL_LPFC2_CFG, 0x15);
> >
> > - rem = rate % VCO_REF_CLK_RATE;
> > + rem = rate % parent_rate;
> > if (rem) {
> > refclk_cfg = DSI_28nm_PHY_PLL_REFCLK_CFG_DBLR;
> > frac_n_mode = 1;
> > - div_fbx1000 = rate / (VCO_REF_CLK_RATE / 500);
> > - gen_vco_clk = div_fbx1000 * (VCO_REF_CLK_RATE / 500);
> > + div_fbx1000 = rate / (parent_rate / 500);
> > + gen_vco_clk = div_fbx1000 * (parent_rate / 500);
> > } else {
> > refclk_cfg = 0x0;
> > frac_n_mode = 0;
> > - div_fbx1000 = rate / (VCO_REF_CLK_RATE / 1000);
> > - gen_vco_clk = div_fbx1000 * (VCO_REF_CLK_RATE / 1000);
> > + div_fbx1000 = rate / (parent_rate / 1000);
> > + gen_vco_clk = div_fbx1000 * (parent_rate / 1000);
> > }
> >
> > DBG("refclk_cfg = %d", refclk_cfg);
> > @@ -265,7 +264,7 @@ static unsigned long dsi_pll_28nm_clk_recalc_rate(struct clk_hw *hw,
> > void __iomem *base = pll_28nm->mmio;
> > u32 sdm0, doubler, sdm_byp_div;
> > u32 sdm_dc_off, sdm_freq_seed, sdm2, sdm3;
> > - u32 ref_clk = VCO_REF_CLK_RATE;
> > + u32 ref_clk = parent_rate;
> > unsigned long vco_rate;
> >
> > VERB("parent_rate=%lu", parent_rate);
> > @@ -273,7 +272,7 @@ static unsigned long dsi_pll_28nm_clk_recalc_rate(struct clk_hw *hw,
> > /* Check to see if the ref clk doubler is enabled */
> > doubler = pll_read(base + REG_DSI_28nm_PHY_PLL_REFCLK_CFG) &
> > DSI_28nm_PHY_PLL_REFCLK_CFG_DBLR;
> > - ref_clk += (doubler * VCO_REF_CLK_RATE);
> > + ref_clk += (doubler * ref_clk);
> >
> > /* see if it is integer mode or sdm mode */
> > sdm0 = pll_read(base + REG_DSI_28nm_PHY_PLL_SDM_CFG0);
> > @@ -514,11 +513,12 @@ static void dsi_pll_28nm_destroy(struct msm_dsi_pll *pll)
> > pll_28nm->clk_data.clk_num = 0;
> > }
> >
> > -static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm)
> > +static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm,
> > + const char *ref_clk_name)
> > {
> > char clk_name[32], parent1[32], parent2[32], vco_name[32];
> > struct clk_init_data vco_init = {
> > - .parent_names = (const char *[]){ "xo" },
> > + .parent_names = &ref_clk_name,
> > .num_parents = 1,
> > .name = vco_name,
> > .flags = CLK_IGNORE_UNUSED,
> > @@ -593,6 +593,8 @@ struct msm_dsi_pll *msm_dsi_pll_28nm_init(struct platform_device *pdev,
> > {
> > struct dsi_pll_28nm *pll_28nm;
> > struct msm_dsi_pll *pll;
> > + struct clk *vco_ref_clk;
> > + const char *vco_ref_clk_name;
> > int ret;
> >
> > if (!pdev)
> > @@ -605,6 +607,18 @@ struct msm_dsi_pll *msm_dsi_pll_28nm_init(struct platform_device *pdev,
> > pll_28nm->pdev = pdev;
> > pll_28nm->id = id;
> >
> > + vco_ref_clk = devm_clk_get(&pdev->dev, "ref");
> > + if (!IS_ERR(vco_ref_clk)) {
> > + vco_ref_clk_name = __clk_get_name(vco_ref_clk);
> > + } else {
> > + ret = PTR_ERR(vco_ref_clk);
> > + if (ret == -EPROBE_DEFER)
> > + ERR_PTR(ret);
>
> It looks like you are missing the return keyword here.
Indeed, thanks for pointing that out!
Cheers
Matthias
