On Tue, Aug 21, 2012 at 4:12 PM, Felipe Balbi <ba...@ti.com> wrote:
> On Sat, Aug 18, 2012 at 12:22:29AM +0530, Venkatraman S wrote:
>> omap hsmmc controller IP has an inbuilt timer that can be programmed to
> ^^^^^^^
> built-in
>> guard against unresponsive operations. But it's range is very narrow,
> ^^^^
> its
>
>
>> and it's maximum countable time is a few seconds.
> ^^^^
> its
>
Will fix.
>
>> Card maintenance operations like BKOPS and SECURE DISCARD and long
>> stream writes like packed command require timers of order of
>> several minutes.
>> So get rid of using the IP timer entirely and use kernel's hrtimer
>> functionality for guarding the device operations.
>> As part of this change, a workaround that disabled timeouts for
>> MMC_ERASE commands is removed, and the arbitary timing of 100ms
>> is used only when the timeout is not explicitly specified by core.
>>
>> Signed-off-by: Venkatraman S <svenk...@ti.com>
>> ---
>> drivers/mmc/host/omap_hsmmc.c | 96
>> ++++++++++++++++++++++---------------------
>> 1 file changed, 50 insertions(+), 46 deletions(-)
>>
>> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
>> index 9afdd20..8f7cebc 100644
>> --- a/drivers/mmc/host/omap_hsmmc.c
>> +++ b/drivers/mmc/host/omap_hsmmc.c
>> @@ -79,7 +79,7 @@
>> #define CLKD_SHIFT 6
>> #define DTO_MASK 0x000F0000
>> #define DTO_SHIFT 16
>> -#define INT_EN_MASK 0x307F0033
>> +#define INT_EN_MASK 0x306E0033
>
> not related to this patch in particular, but it would be nice if this
> was converted to something more meaningfull, like ORing a bunch of bit
> defines.
>
Sure. Good to do now as part of the change.
>> #define BWR_ENABLE (1 << 4)
>> #define BRR_ENABLE (1 << 5)
>> #define DTO_ENABLE (1 << 20)
>> @@ -160,6 +160,7 @@ struct omap_hsmmc_host {
>> unsigned int dma_sg_idx;
>> unsigned char bus_mode;
>> unsigned char power_mode;
>> + unsigned int ns_per_clk_cycle;
>> int suspended;
>> int irq;
>> int use_dma, dma_ch;
>> @@ -172,6 +173,7 @@ struct omap_hsmmc_host {
>> int reqs_blocked;
>> int use_reg;
>> int req_in_progress;
>> + struct hrtimer guard_timer;
>> struct omap_hsmmc_next next_data;
>>
>> struct omap_mmc_platform_data *pdata;
>> @@ -455,10 +457,6 @@ static void omap_hsmmc_enable_irq(struct
>> omap_hsmmc_host *host,
>> else
>> irq_mask = INT_EN_MASK;
>>
>> - /* Disable timeout for erases */
>> - if (cmd->opcode == MMC_ERASE)
>> - irq_mask &= ~DTO_ENABLE;
>> -
>> OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
>> OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
>> OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
>> @@ -508,6 +506,9 @@ static void omap_hsmmc_set_clock(struct omap_hsmmc_host
>> *host)
>> && time_before(jiffies, timeout))
>> cpu_relax();
>>
>> + if (ios->clock)
>> + host->ns_per_clk_cycle = DIV_ROUND_UP(NSEC_PER_SEC,
>> ios->clock);
>> +
>> omap_hsmmc_start_clock(host);
>> }
>>
>> @@ -824,7 +825,7 @@ omap_hsmmc_xfer_done(struct omap_hsmmc_host *host,
>> struct mmc_data *data)
>> omap_hsmmc_request_done(host, mrq);
>> return;
>> }
>> -
>> + hrtimer_cancel(&host->guard_timer);
>> host->data = NULL;
>>
>> if (!data->error)
>> @@ -859,8 +860,11 @@ omap_hsmmc_cmd_done(struct omap_hsmmc_host *host,
>> struct mmc_command *cmd)
>> cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
>> }
>> }
>> - if ((host->data == NULL && !host->response_busy) || cmd->error)
>> + if ((host->data == NULL && !host->response_busy) || cmd->error) {
>
> could just go ahead and make this check uniform by:
>
> if ((!host->data && !host->response_busy)) || cmd->error)
>
Ok.
>> + if (cmd->error != -ETIMEDOUT)
>> + hrtimer_cancel(&host->guard_timer);
>> omap_hsmmc_request_done(host, cmd->mrq);
>> + }
>> }
>>
>> /*
>> @@ -992,7 +996,7 @@ static void omap_hsmmc_do_irq(struct omap_hsmmc_host
>> *host, int status)
>> hsmmc_command_incomplete(host, -EILSEQ);
>>
>> end_cmd = 1;
>> - if (host->data || host->response_busy) {
>> + if (data || host->response_busy) {
>
> This doesn't seem like it belongs to $SUBJECT...
>
I thought is was a small fix which didn't warrant a separate patch though.
>> end_trans = 1;
>> host->response_busy = 0;
>> }
>> @@ -1292,41 +1296,35 @@ static int omap_hsmmc_start_dma_transfer(struct
>> omap_hsmmc_host *host,
>> return 0;
>> }
>>
>> -static void set_data_timeout(struct omap_hsmmc_host *host,
>> - unsigned int timeout_ns,
>> - unsigned int timeout_clks)
>> +static void set_guard_timer(struct omap_hsmmc_host *host,
>> + unsigned long timeout_ms, unsigned long timeout_ns,
>> + unsigned int timeout_clks)
>> {
>> - unsigned int timeout, cycle_ns;
>> - uint32_t reg, clkd, dto = 0;
>> + ktime_t gtime;
>> + unsigned int sec, nsec;
>>
>> - reg = OMAP_HSMMC_READ(host->base, SYSCTL);
>> - clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
>> - if (clkd == 0)
>> - clkd = 1;
>> + sec = timeout_ms / MSEC_PER_SEC;
>> + nsec = (timeout_ms % MSEC_PER_SEC) * NSEC_PER_MSEC + timeout_ns;
>>
>> - cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
>> - timeout = timeout_ns / cycle_ns;
>> - timeout += timeout_clks;
>> - if (timeout) {
>> - while ((timeout & 0x80000000) == 0) {
>> - dto += 1;
>> - timeout <<= 1;
>> - }
>> - dto = 31 - dto;
>> - timeout <<= 1;
>> - if (timeout && dto)
>> - dto += 1;
>> - if (dto >= 13)
>> - dto -= 13;
>> - else
>> - dto = 0;
>> - if (dto > 14)
>> - dto = 14;
>> - }
>> + nsec += timeout_clks * host->ns_per_clk_cycle;
>> + gtime = ktime_set(sec, nsec);
>>
>> - reg &= ~DTO_MASK;
>> - reg |= dto << DTO_SHIFT;
>> - OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
>> + hrtimer_start(&host->guard_timer, gtime, HRTIMER_MODE_REL);
>> +}
>> +
>> +enum hrtimer_restart omap_hsmmc_timedout(struct hrtimer *gtimer)
>
> static ?
>
Right!
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
