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Date: Wed, 11 Mar 2020 14:17:17 +0530
From: Maulik Shah <mkshah@...eaurora.org>
To: Douglas Anderson <dianders@...omium.org>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Rajendra Nayak <rnayak@...eaurora.org>, mka@...omium.org,
evgreen@...omium.org, swboyd@...omium.org,
Lina Iyer <ilina@...eaurora.org>,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFT PATCH 1/9] drivers: qcom: rpmh-rsc: Clean code
reading/writing regs/cmds
Hi,
On 3/7/2020 5:29 AM, Douglas Anderson wrote:
> This patch makes two changes, both of which should be no-ops:
>
> 1. Make read_tcs_reg() / read_tcs_cmd() symmetric to write_tcs_reg() /
> write_tcs_cmd().
i agree that there are two different write function doing same thing except last addition (RSC_DRV_CMD_OFFSET * cmd_id)
can you please rename write_tcs_cmd() to write_tcs_reg(), add above operation in it, and then remove existing write_tcs_reg().
this way we have only one read and one write function.
so at the end we will two function as,
static u32 read_tcs_reg(struct rsc_drv *drv, int reg, int tcs_id, int cmd_id)
{
return readl_relaxed(drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * tcs_id +
RSC_DRV_CMD_OFFSET * cmd_id);
}
static void write_tcs_reg(struct rsc_drv *drv, int reg, int tcs_id, int cmd_id,
u32 data)
{
writel_relaxed(data, drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * tcs_id +
RSC_DRV_CMD_OFFSET * cmd_id);
}
>
> 2. Change the order of operations in the above functions to make it
> more obvious to me what the math is doing. Specifically first you
> want to find the right TCS, then the right register, and then
> multiply by the command ID if necessary.
With above change, i don't think you need to re-order this.
specifically from tcs->base, we find right "reg" first and if it happens to be tcs then intended tcs, and then cmd inside tcs.
Thanks,
Maulik
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
>
> drivers/soc/qcom/rpmh-rsc.c | 31 ++++++++++++++++++-------------
> 1 file changed, 18 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
> index e278fc11fe5c..5c88b8cd5bf8 100644
> --- a/drivers/soc/qcom/rpmh-rsc.c
> +++ b/drivers/soc/qcom/rpmh-rsc.c
> @@ -61,28 +61,33 @@
> #define CMD_STATUS_ISSUED BIT(8)
> #define CMD_STATUS_COMPL BIT(16)
>
> -static u32 read_tcs_reg(struct rsc_drv *drv, int reg, int tcs_id, int cmd_id)
> +static u32 read_tcs_cmd(struct rsc_drv *drv, int reg, int tcs_id, int cmd_id)
> {
> - return readl_relaxed(drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * tcs_id +
> + return readl_relaxed(drv->tcs_base + RSC_DRV_TCS_OFFSET * tcs_id + reg +
> RSC_DRV_CMD_OFFSET * cmd_id);
> }
>
> +static u32 read_tcs_reg(struct rsc_drv *drv, int reg, int tcs_id)
> +{
> + return readl_relaxed(drv->tcs_base + RSC_DRV_TCS_OFFSET * tcs_id + reg);
> +}
> +
> static void write_tcs_cmd(struct rsc_drv *drv, int reg, int tcs_id, int cmd_id,
> u32 data)
> {
> - writel_relaxed(data, drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * tcs_id +
> + writel_relaxed(data, drv->tcs_base + RSC_DRV_TCS_OFFSET * tcs_id + reg +
> RSC_DRV_CMD_OFFSET * cmd_id);
> }
>
> static void write_tcs_reg(struct rsc_drv *drv, int reg, int tcs_id, u32 data)
> {
> - writel_relaxed(data, drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * tcs_id);
> + writel_relaxed(data, drv->tcs_base + RSC_DRV_TCS_OFFSET * tcs_id + reg);
> }
>
> static void write_tcs_reg_sync(struct rsc_drv *drv, int reg, int tcs_id,
> u32 data)
> {
> - writel(data, drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * tcs_id);
> + writel(data, drv->tcs_base + RSC_DRV_TCS_OFFSET * tcs_id + reg);
> for (;;) {
> if (data == readl(drv->tcs_base + reg +
> RSC_DRV_TCS_OFFSET * tcs_id))
> @@ -94,7 +99,7 @@ static void write_tcs_reg_sync(struct rsc_drv *drv, int reg, int tcs_id,
> static bool tcs_is_free(struct rsc_drv *drv, int tcs_id)
> {
> return !test_bit(tcs_id, drv->tcs_in_use) &&
> - read_tcs_reg(drv, RSC_DRV_STATUS, tcs_id, 0);
> + read_tcs_reg(drv, RSC_DRV_STATUS, tcs_id);
> }
>
> static struct tcs_group *get_tcs_of_type(struct rsc_drv *drv, int type)
> @@ -212,7 +217,7 @@ static irqreturn_t tcs_tx_done(int irq, void *p)
> const struct tcs_request *req;
> struct tcs_cmd *cmd;
>
> - irq_status = read_tcs_reg(drv, RSC_DRV_IRQ_STATUS, 0, 0);
> + irq_status = read_tcs_reg(drv, RSC_DRV_IRQ_STATUS, 0);
>
> for_each_set_bit(i, &irq_status, BITS_PER_LONG) {
> req = get_req_from_tcs(drv, i);
> @@ -226,7 +231,7 @@ static irqreturn_t tcs_tx_done(int irq, void *p)
> u32 sts;
>
> cmd = &req->cmds[j];
> - sts = read_tcs_reg(drv, RSC_DRV_CMD_STATUS, i, j);
> + sts = read_tcs_cmd(drv, RSC_DRV_CMD_STATUS, i, j);
> if (!(sts & CMD_STATUS_ISSUED) ||
> ((req->wait_for_compl || cmd->wait) &&
> !(sts & CMD_STATUS_COMPL))) {
> @@ -265,7 +270,7 @@ static void __tcs_buffer_write(struct rsc_drv *drv, int tcs_id, int cmd_id,
> cmd_msgid |= msg->wait_for_compl ? CMD_MSGID_RESP_REQ : 0;
> cmd_msgid |= CMD_MSGID_WRITE;
>
> - cmd_complete = read_tcs_reg(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, tcs_id, 0);
> + cmd_complete = read_tcs_reg(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, tcs_id);
>
> for (i = 0, j = cmd_id; i < msg->num_cmds; i++, j++) {
> cmd = &msg->cmds[i];
> @@ -281,7 +286,7 @@ static void __tcs_buffer_write(struct rsc_drv *drv, int tcs_id, int cmd_id,
> }
>
> write_tcs_reg(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, tcs_id, cmd_complete);
> - cmd_enable |= read_tcs_reg(drv, RSC_DRV_CMD_ENABLE, tcs_id, 0);
> + cmd_enable |= read_tcs_reg(drv, RSC_DRV_CMD_ENABLE, tcs_id);
> write_tcs_reg(drv, RSC_DRV_CMD_ENABLE, tcs_id, cmd_enable);
> }
>
> @@ -294,7 +299,7 @@ static void __tcs_trigger(struct rsc_drv *drv, int tcs_id)
> * While clearing ensure that the AMC mode trigger is cleared
> * and then the mode enable is cleared.
> */
> - enable = read_tcs_reg(drv, RSC_DRV_CONTROL, tcs_id, 0);
> + enable = read_tcs_reg(drv, RSC_DRV_CONTROL, tcs_id);
> enable &= ~TCS_AMC_MODE_TRIGGER;
> write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
> enable &= ~TCS_AMC_MODE_ENABLE;
> @@ -319,10 +324,10 @@ static int check_for_req_inflight(struct rsc_drv *drv, struct tcs_group *tcs,
> if (tcs_is_free(drv, tcs_id))
> continue;
>
> - curr_enabled = read_tcs_reg(drv, RSC_DRV_CMD_ENABLE, tcs_id, 0);
> + curr_enabled = read_tcs_reg(drv, RSC_DRV_CMD_ENABLE, tcs_id);
>
> for_each_set_bit(j, &curr_enabled, MAX_CMDS_PER_TCS) {
> - addr = read_tcs_reg(drv, RSC_DRV_CMD_ADDR, tcs_id, j);
> + addr = read_tcs_cmd(drv, RSC_DRV_CMD_ADDR, tcs_id, j);
> for (k = 0; k < msg->num_cmds; k++) {
> if (addr == msg->cmds[k].addr)
> return -EBUSY;
--
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