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SubjectRe: [PATCH] mmc: rtsx: change phase searching method
Hi Chris:

Have you accepted this patch, I'm waiting a long time for your reply.

Best Reagards.
micky

On 09/02/2013 05:16 PM, micky_ching@realsil.com.cn wrote:
> From: Micky Ching <micky_ching@realsil.com.cn>
>
> The new phase searching method is more concise, and makes the code
> easier to understand.
>
> Signed-off-by: Micky Ching <micky_ching@realsil.com.cn>
> ---
> drivers/mmc/host/rtsx_pci_sdmmc.c | 107 +++++++++++--------------------------
> 1 file changed, 30 insertions(+), 77 deletions(-)
>
> diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c
> index f981f7d..299a27c 100644
> --- a/drivers/mmc/host/rtsx_pci_sdmmc.c
> +++ b/drivers/mmc/host/rtsx_pci_sdmmc.c
> @@ -32,15 +32,6 @@
> #include <linux/mfd/rtsx_pci.h>
> #include <asm/unaligned.h>
>
> -/* SD Tuning Data Structure
> - * Record continuous timing phase path
> - */
> -struct timing_phase_path {
> - int start;
> - int end;
> - int mid;
> - int len;
> -};
>
> struct realtek_pci_sdmmc {
> struct platform_device *pdev;
> @@ -497,85 +488,47 @@ static int sd_change_phase(struct realtek_pci_sdmmc *host, u8 sample_point)
> return 0;
> }
>
> -static u8 sd_search_final_phase(struct realtek_pci_sdmmc *host, u32 phase_map)
> +static inline u32 get_phase_point(u32 phase_map, unsigned int idx)
> {
> - struct timing_phase_path path[MAX_PHASE + 1];
> - int i, j, cont_path_cnt;
> - int new_block, max_len, final_path_idx;
> - u8 final_phase = 0xFF;
> + idx &= MAX_PHASE;
> + return phase_map & (1 << idx);
> +}
> +
> +static int get_phase_len(u32 phase_map, unsigned int idx)
> +{
> + int i;
>
> - /* Parse phase_map, take it as a bit-ring */
> - cont_path_cnt = 0;
> - new_block = 1;
> - j = 0;
> for (i = 0; i < MAX_PHASE + 1; i++) {
> - if (phase_map & (1 << i)) {
> - if (new_block) {
> - new_block = 0;
> - j = cont_path_cnt++;
> - path[j].start = i;
> - path[j].end = i;
> - } else {
> - path[j].end = i;
> - }
> - } else {
> - new_block = 1;
> - if (cont_path_cnt) {
> - /* Calculate path length and middle point */
> - int idx = cont_path_cnt - 1;
> - path[idx].len =
> - path[idx].end - path[idx].start + 1;
> - path[idx].mid =
> - path[idx].start + path[idx].len / 2;
> - }
> - }
> + if (get_phase_point(phase_map, idx + i) == 0)
> + return i;
> }
> + return MAX_PHASE + 1;
> +}
>
> - if (cont_path_cnt == 0) {
> - dev_dbg(sdmmc_dev(host), "No continuous phase path\n");
> - goto finish;
> - } else {
> - /* Calculate last continuous path length and middle point */
> - int idx = cont_path_cnt - 1;
> - path[idx].len = path[idx].end - path[idx].start + 1;
> - path[idx].mid = path[idx].start + path[idx].len / 2;
> - }
> +static u8 sd_search_final_phase(struct realtek_pci_sdmmc *host, u32 phase_map)
> +{
> + int start = 0, len = 0;
> + int start_final = 0, len_final = 0;
> + u8 final_phase = 0xFF;
>
> - /* Connect the first and last continuous paths if they are adjacent */
> - if (!path[0].start && (path[cont_path_cnt - 1].end == MAX_PHASE)) {
> - /* Using negative index */
> - path[0].start = path[cont_path_cnt - 1].start - MAX_PHASE - 1;
> - path[0].len += path[cont_path_cnt - 1].len;
> - path[0].mid = path[0].start + path[0].len / 2;
> - /* Convert negative middle point index to positive one */
> - if (path[0].mid < 0)
> - path[0].mid += MAX_PHASE + 1;
> - cont_path_cnt--;
> + if (phase_map == 0) {
> + dev_dbg(sdmmc_dev(host), "Phase: [map:%x]\n", phase_map);
> + return final_phase;
> }
>
> - /* Choose the longest continuous phase path */
> - max_len = 0;
> - final_phase = 0;
> - final_path_idx = 0;
> - for (i = 0; i < cont_path_cnt; i++) {
> - if (path[i].len > max_len) {
> - max_len = path[i].len;
> - final_phase = (u8)path[i].mid;
> - final_path_idx = i;
> + while (start < MAX_PHASE + 1) {
> + len = get_phase_len(phase_map, start);
> + if (len_final < len) {
> + start_final = start;
> + len_final = len;
> }
> -
> - dev_dbg(sdmmc_dev(host), "path[%d].start = %d\n",
> - i, path[i].start);
> - dev_dbg(sdmmc_dev(host), "path[%d].end = %d\n",
> - i, path[i].end);
> - dev_dbg(sdmmc_dev(host), "path[%d].len = %d\n",
> - i, path[i].len);
> - dev_dbg(sdmmc_dev(host), "path[%d].mid = %d\n",
> - i, path[i].mid);
> + start += len ? len : 1;
> }
>
> -finish:
> - dev_dbg(sdmmc_dev(host), "Final chosen phase: %d\n", final_phase);
> + final_phase = (start_final + len_final / 2) & MAX_PHASE;
> + dev_dbg(sdmmc_dev(host), "Phase: [map:%x] [maxlen:%d] [final:%d]\n",
> + phase_map, len_final, final_phase);
> +
> return final_phase;
> }
>



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