On 14-05-18, 16:16, Sricharan R wrote:
> +static int q6v5_reset(struct q6v5 *qproc)
> +{
> + u32 ret;
> + int val, i;
> +
> + /* Assert resets, stop core */
> + val = readl(qproc->reg_base + QDSP6SS_RESET_REG);
> + val |= Q6SS_CORE_ARES | Q6SS_BUS_ARES_ENABLE | Q6SS_STOP_CORE;
> + writel(val, qproc->reg_base + QDSP6SS_RESET_REG);
> +
> + /* BHS require xo cbcr to be enabled */
> + val = readl(qproc->reg_base + QDSP6SS_XO_CBCR);
> + val |= 0x1;
> + writel(val, qproc->reg_base + QDSP6SS_XO_CBCR);
consider adding a updatel macro which does read, update and write for you...
> +
> + /* Read CLKOFF bit to go low indicating CLK is enabled */
> + ret = readl_poll_timeout(qproc->reg_base + QDSP6SS_XO_CBCR,
> + val, !(val & BIT(31)), 1,
> + HALT_CHECK_MAX_LOOPS);
> + if (ret) {
> + dev_err(qproc->dev,
> + "xo cbcr enabling timed out (rc:%d)\n", ret);
> + return ret;
> + }
> + /* Enable power block headswitch and wait for it to stabilize */
> + val = readl(qproc->reg_base + QDSP6SS_PWR_CTL_REG);
> + val |= QDSP6v56_BHS_ON;
> + writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
> + val |= readl(qproc->reg_base + QDSP6SS_PWR_CTL_REG);
why is this read required
> + udelay(1);
> +
> + /* Put LDO in bypass mode */
> + val |= QDSP6v56_LDO_BYP;
> + writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
> +
> + /* Deassert QDSP6 compiler memory clamp */
> + val = readl(qproc->reg_base + QDSP6SS_PWR_CTL_REG);
> + val &= ~QDSP6v56_CLAMP_QMC_MEM;
> + writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
> +
> + /* Deassert memory peripheral sleep and L2 memory standby */
> + val |= Q6SS_L2DATA_STBY_N | Q6SS_SLP_RET_N;
> + writel(val, qproc->reg_base + QDSP6SS_PWR_CTL_REG);
> +
> + /* Turn on L1, L2, ETB and JU memories 1 at a time */
> + val = readl(qproc->reg_base + QDSP6SS_MEM_PWR_CTL);
> + for (i = 19; i >= 0; i--) {
where is the magic number 19 coming from?
--
~Vinod
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
